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Timber in architecturesupplement

CONTENTS

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Industry news

COMMENT: Growing opportunities for specifying timberKevin Underwood of the British Woodworking Federation discusses thechallenges as well as benefits of using wood as a construction material

COMMENT: Assured solutions in a crisisAndrew Carpenter of the Structural Timber Association says that thetimber solutions already exist for building the energy-efficient low-carbondwellings the Government is calling for to address the housing crisis, nowunderpinned by robust assurances

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Climb every mountainChallenged by steep topography, unspoilt alpine surroundings,and a devastating fire after its initial construction, the creation of acommunity sports and activity hall brought architect, client and localstogether in the Swiss village of Le Vaud. Sébastien Reed speaks to architectLaurent Saurer

All hands on deckThe UK’s official agency for shipping and Royal Navy data has a newheadquarters in Somerset, designed to push collaboration to the fore, in anopen and fluid structure enhanced by timber throughout. Jack Woolerreports on how the AHR-designed project helps workers engage in a ‘oneteam culture’

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Modification, innovation and sustainabilityDr Andy Pitman of Lignia Wood Company discusses how the UK timberindustry is embracing change and innovating – for the benefit of theenvironment and the customer

Is your timber specification fit for purpose?Janet Sycamore of the Timber Decking and Cladding Association discusseswhy and how the details of timber protection needs to be embraced toensure specifications are always fit for purpose

Looking past the uncertaintyGavin Knowles of Howarth Timber & Building Supplies on why scrutinyneeds to be applied to ensure correct product specification, which is alsobeing applied to the industry

PROJECTS

FEATURES

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4 NEWS

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FROMTHE EDITORTimber is undoubtedly the only all-natural material we currently know of that has such a widerange of applications in construction. Its unrivalled combination of beauty, sustainability,wellness, durability, strength and versatility means that it remains at the top of the list for manyarchitects, and that’s despite the recent setback of CLT being placed under threat for tallerstructures post-Grenfell.

As our contributor from the British Woodworking Federation confirms on page 7, there’s noreason why most materials in a modern structure can’t be made of timber. When it comes toCLT for example however, it would be useful to have some UK production to enable specifiersto shop around more locally, particularly as we confront the challenge of Brexit and a weakerpound forcing import costs ever upwards.

Many of the projects shortlisted for this year’s Wood Awards feature intricately designedstructures which demonstrate the potential of timber technology combined with advances inCNC machining to produce exciting and structurally robust forms. The timber may be sourcedfrom Europe or further afield, but often the architectural and engineering expertise that’s beingemployed to push it to new limits is home-grown.

Examples from the shortlist include architects Haworth Tomkins’ ornate timber ceiling for therefurbished Battersea Arts Centre, providing great acoustics as well as a highly unusual but stillfitting new look. Cambridge Central Mosque by Marks Barfield Architects sees the architectsfinding an alternative to stone vaults using engineered spruce, and albeit less high-profile, butno less impressive, Gianni Botsford Architects created a funnelling, grid-formed timber ceilingfor a house in London that is simultaneously high-tech and organic.

In total, 20 impressive structures (as well as 12 new timber products) have been nominated forthe Wood Awards 2019 shortlist. The shortlisted entries will be displayed at 100% Design,which takes place from 18-21 September, at London’s Olympia. The winners will be revealed atthe annual Wood Awards ceremony at Carpenters’ Hall, London on 19 November.

I encourage you to visit the event to see examples of what can be done in timber, as well asdelving into the case studies and news story subjects featured within this special supplement.

James ParkerEditor

ON THE COVER...The interior of Polyvalent Hall in the Swiss village of Le Vaud is constructed exclusively fromlocally sourced white pine treated with a UVprotected solution which will maintain the wood’sbright colour.For the full report on this project, go to page 12Cover Image © Matthieu Gafsou

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WilkinsonEyre has completed a series ofbuildings housing undergraduates at theDyson Institute of Engineering andTechnology in Wiltshire. The landscapedvillage of modular timber housing pods, withcommunal amenities and a central social andlearning hub, is based within the DysonMalmesbury Campus. As well as establishinga “new typology” in student accommodation,according to the architects, the project breaksground in the design, masterplanning andprecision engineering of “truly modularprefabricated building technologies for rapidconstruction.”

Dyson Institute of Engineering andTechnology is being hailed as a new modelof learning that integrates a higher educa-tion campus into the context of commercialindustry, research and development. Thevillage will house a “new generation” ofengineering students who will work along-side the Dyson Global Engineering Teamand study for an engineering degree. Thepioneering approach to materials andconstruction, and fresh thinking on studentwellbeing echoes the ethos of innovationthat runs throughout the campus.

The village is designed to accommodateup to 50 Dyson Institute of Engineering andTechnology students plus visiting Dysonstaff. The “living pods” are fabricated fromcross-laminate timber (CLT) in a factory forrapid on-site assembly. The pods arearranged in units two to three stories high,to create a welcoming social space and anappealing addition to the campus alongsidethe larger industrial buildings.Certain clusters involve some pods being

cantilevered by up to three metres, “pushingthe structural properties of CLT,” said thearchitects. The pods are also designed toharness CLT’s thermal mass, and providehigh quality and energy efficient livingspaces.In terms of aesthetics, the timber has

been left exposed throughout the pods’internal spaces, including the kitchens andbathrooms, to create “warm and natural”living environments.With wellbeing as a prime design

consideration, each pod has been designedwith natural ventilation and large, triple-glazed windows, individually angled to giveeach resident a view across the campus. The

pods are clad externally with aluminiumrainscreen panels, and, depending on theirposition within each unit, have sedum-covered roofs.Measuring 8 metres by 4 metres, each pod

has open-plan accommodation comprisingan entrance zone with an adjacent showerand toilet, a central bedroom area and awork/living space, positioned to optimise thegenerous levels of natural light. The podswere manufactured offsite and each unit wasdelivered to site fully fitted with bespokefurniture and built-in storage, before beingcraned into position.The pods are arranged in a variety

of cluster configurations, within the crescent-shaped site, following the curve of asurrounding landscaped embankment. Eachcluster consists of up to six units, including ashared kitchen and laundry space at midentry level, and an entry area with receptionand storage. To create the feel of a studentvillage, each pod has its own front door, withlower pods opening onto landscapedgardens, and higher ones accessed by pathson curved earth ramps and stairs to theupper level.

The dynamic variety of configurations

lends an “informal, residential character” tothe village, said the architects. Green spacesand pathways “determine user movementthrough the village and mediate connec-tions between the residential accommoda-tion and the communal clubhouse – namedthe Roundhouse – at the centre.”

The Roundhouse, designed as a social space for students, is conceived as a freestanding, transparent and outward-facing circular pavilion. Thelightweight steel structure is formed of two stacked cylinders, surmounted by anoversailing brise soleil roof. “Designed tomediate between the accommodationclusters and the wider Dyson campus, it isdivided into the southern side – “transpar-ent and social,” and the northern side,which is “metal-clad and functional”. Itsfacilities include a café, bar, lecture halland study space.Yasmin Al-Ani Spence, director of

WilkinsonEyre, said “We are delighted tohave worked with Dyson to develop thisnew typology for high quality studentaccommodation, creating an innovativecommunity where students can learn, workand live on site.”

A ‘new typology’ from WilkinsonEyre STUDENT ACCOMMODATION

Dyson Institute of Engineering and Technology © Peter Landers


6 NEWS


Paul Cashin Architects have completed aextension to a Grade II listed property inthe village of Twyford, near Winchester.Marshall House dates back to the 17th

century, although it was remodelled andextended during the late 18th century.The brief was to replace an existing

lean-to and 20th century conservatorywith a new contemporary extension.“The design was developed in close

consultation with the local authority, inorder to respect the existing property andwork to achieve a positive planningoutcome,” said the architects.The extension is accessed via a small

link that provides a “clear distinctionbetween the old and new structures.” Thedesign concept is centred on “the idea ofcontrasts.” The link has been designed togive the effect of “walking through aportal into a seemingly different dwelling,that is modern, bright, light and airy withclean lines and white walls.”Externally, timber larch cladding was

used as the primary material. This waspainted black with a heavy duty, long-lasting barn paint. The black finish of the

extension contrasts with the white paintedbrickwork at the rear and side of theoriginal house. The external colour paletteof both structures “is in opposition to thereality of the interior spaces.”The architects commented on the design

of the building’s exterior: “Althoughtimber cladding is a fairly standard,commonplace material, visual depth anddistinction has been created through thearticulation of the boards.” The inclusionof timber fins changes the way shadowsare cast across the external surface duringthe day, while at night, these areilluminated by external lighting.A secondary entrance to the house is

provided through a concealed door thatwas also finished to match the cladding. Windows and roof lights have been

strategically placed in order to cast light over walls and corners in theextension to create “little nooks andprivate views.” The overall form isinformed by the “awkward shape anduses of the site,” resulting in the walls notbeing parallel in plan and splaying out atdifferent, irregular angles.

A key industry event, the StructuralTimber Awards is hailed by theorganisers as “a celebration ofinnovation, best practice and expert-ise in timber technology.” Takingplace on 9 October at the NEC,Birmingham, the awards willshowcase “innovative solutions andground-breaking developments” fromacross the UK timber industry.With over 200 entries representing

“outstanding, pioneering projects,products and people” this year’spanel of award judges have report-edly had a tough job shortlistingentries for each category. “The judgeshave been overwhelmed with thehigh standard and variety,” said theorganisers.The finalists for this year’s awards

can be found at www.structuraltim-ber awards.co.uk/2019-finalists.The awards will be presented to the

at a high-profile dinner that is hopedto attract over 550 “national businessleaders and high profile decisionmakers” from across the constructionindustry. The organisers report thathalf the tables have already sold, so itis shaping up to be a big networkingevent in the industry calendar.To book tickets to the Structural

Timber Awards please visitwww.structuraltimberawards.co.uk

2019 StructuralTimber Awards finalists areannounced

AWARDS

Paul Cashin Architects’cladding of contrasts

RESIDENTIAL


Wood, the world’s oldest and most traditional buildingmaterial, is increasingly being re-evaluated as amodern-day first choice for both structural and interior

applications across domestic and commercial buildings. Forexample, the structural frame of the building, the roof trusses,flooring, walls, stairs, windows, doors and interior furnishingscould in theory all be made from wood. As a renewable materialcoupled with modern manufacturing, wood is proving to be thecatalyst for architecture and construction professionals in creatingspaces that promote lower carbon emissions, longevity, beauty, anda real connection to nature.

The ability to create both structural and aesthetic features fromwood is due to the wide range of natural species and fabricatedproducts available today. From natural hardwoods and softwoods,plywood and chipboard, to glued laminated (glulam) beams andcross-laminated timber (CLT), wood offers unique properties toarchitects which are all underpinned by the material’s inherenthealth and wellbeing benefits, added to its sustainable andphysical characteristics.

Benefits of timber The global movement towards creating spaces that are functional,practical and support the health and wellbeing of the building’soccupants, has driven up the use of wood as a building material.There is a growing desire among the occupants of commercialbuildings to work in an environment with a high use of naturalmaterials, with research finding that employee wellbeing was15 per cent higher in office spaces where natural elements wereincorporated. Natural building materials have also been found toimprove both the mental and physical wellbeing of people byhelping reduce stress, blood pressure and heart rates.

From a functional perspective, wood also acts as a naturalhumidity regulator, which can absorb moisture from theatmosphere during times of higher humidity, and release moistureback into the atmosphere during dry periods.

In addition, for commercial environments durability is essential,and this is where the specification of timber has proven benefits.

REDWOOD IN THE CITYGeorge Barnsdale & Sons manufactured timber sliding sash windows with archedheads to match the original appearance of the Rex Building in the City of London

Kevin Underwood of the British Woodworking Federation discusses the challenges aswell as wide-ranging benefits of using wood as a construction material

Growing opportunities for specifying timber

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Take timber windows as an example, the 2013 report ‘Whole LifeAnalysis of Timber, Modified Timber and Aluminium-clad TimberWindows’ by Heriot-Watt University looked at a timber casementwindow made to Wood Window Alliance standards and found thatthe window had an expected average service life of 56 to 65 yearsdepending on the level of exposure; double that of a PVCu window,which was found to have an average service life of between 26 to35 years. This presents significant lifetime cost savings andlongevity of build for both the current and future building owner.Wood is also the key component of in excess of four million

timber fire doors manufactured across the UK each year, whichhelp to save lives and protect property every day. Many Fire DoorAlliance (FDA) members have taken part in the ongoing Ministryof Housing, Communities and Local Government (MHCLG) firedoor investigation post-Grenfell, where the findings so far haveshown that FDA member doors marketed to reach at least30 minutes of performance have resisted fire for as long as54 minutes, surpassing the 30 minute requirement by 24 minutes.

ConsiderationsWhen specifying any material, there are considerations that needto be addressed and this can also be said for wood in commercialspaces. Many factors will be specific either to the building itself,the timeline of the project, or whether it is desired that a particularsustainability standard is achieved. For example, wood flooring is ideal for many commercial

environments and can be used in conjunction with a concrete,steel or timber structural base. However, awareness and correct

specification of uniquely engineered timbers is needed whenaccreditations, such as BREEAM, are desired. Ongoing innovationin manufacturing technology and engineered wood products hasresulted in the material being used where previously it may nothave been possible.A prime example is the Woodland Trust Headquarters in

Grantham, where the building achieves a BREEAM ‘excellent’rating by passively absorbing the excess heat generated by theoffice during the day. At the site, precast concrete “radiators” werebolted to the ceiling soffits of the CLT floor panels to enhance thethermal mass of the building while retaining the use of wood asthe main construction material.When considering specifying windows and doors, alongside

the regulatory requirements associated with their use, such asanti-ligature guards, measures to prevent finger trapping or toprotect people from falling, other characteristics of wood windowsand doors need to be considered. This includes the product’smechanical strength and security, weather resistance, thermal andacoustic insulation, heat and light transmission, operating forces,and long-term durability.Further to this an important consideration of any product

specification is its ongoing maintenance requirements. All windowsand doors require maintenance regardless of the material fromwhich they are made. For example, the surfaces of the glazing andframe need regular cleaning and hardware requires lubrication.Within their service life many will also require re-glazing and sealsmay need to be replaced, so it’s important that all windows anddoors are periodically checked for any damage or wear. For wood windows and doors, should any minor defects

in the coating be detected during the inspection, these can besimply retouched with a spot repair. This means that only arenovation coating needs to be applied to maintain the coating’ssheen, colour and durability, which effectively prevents the needfor full redecoration. A clear demonstration of the longevity of timber products is the

results from a recent trial at the Building Research Establishment(BRE), which involved BWF member Stora Enso Timber UK.The findings show that wood windows made from untreatedheartwood redwood (pinus sylvestris) with a water based acryliccoating have remained in excellent condition after 14 years ofsouth facing exposure with no intermediate maintenance, andwill need only a simple refurbishment coat to extend theirserviceability further. The opportunities for wood in commercial environments are

vast, and with technological advancements creating innovativenew wood products we only expect these to increase. Forarchitects seeking support, guidance and expert technical insight,the British Woodworking Federation provides dedicated designguides and a technical advice line.

Kevin Underwood is technical director of the British Woodworking Federation

The opportunities for wood in commercialenvironments are vast, and withtechnological advancements creatinginnovative new wood products we onlyexpect these to increase

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www.jamesjones.co.uk/ewp

COMMENT

Offsite construction presents many new opportunities for anindustry looking to improve productivity, reduce wasteand deliver better quality buildings at a fast rate. Offsite

technology is hailed as the solution to resolving some of the mostchallenging problems facing the construction industry today, mostnotably the shortfall in housing supply and the skills shortage.

The Government, industry funders, insurers and stakeholderstogether with contractors, housebuilders and clients, recognise therole timber technology must play in this vital area. And, despite theGovernment’s initial attempts to constrain the low carbon agendathrough the closing of the Zero Carbon Hub and scrapping of theCode for Sustainable Homes, it is growing in prominence, thanksto customers. Environmentally conscious clients are demandingsustainable building materials be used wherever and wheneverpossible, and this of course favours timber.

The Government’s recent change of heart was probably bestrealised in their Future Homes Standard. As part of his CleanGrowth strategy, the Chancellor Philip Hammond announced plansin the Spring Statement to develop energy efficient, low-carbonhomes with the introduction of the Future Homes Standard.This will require new residential builds to be future-proofed withlow-carbon heating and energy efficiency to make homes better for

Andrew Carpenter of the Structural Timber Association says that the timber solutionsalready exist for building the energy-efficient low-carbon dwellings the Government iscalling for to address the housing crisis, now underpinned by robust assurances

QUALITY ASSUREDIn 2018 the Structural Timber Association’s STA Assure quality standards scheme became mandatory for members

Assured solutions in a crisis

Environmentally conscious clients aredemanding sustainable building materialsbe used wherever and whenever possible,and this of course favours timber

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the environment. Our response to this strategy is unequivocal – wewelcome the introduction of the Future Homes Standard, but wehave to ask, why wait until 2025 and miss the opportunity to takethese important steps now? Fortunately, we do not have to invent the solutions to develop

energy efficient, low-carbon homes. We just need to make betteruse of what is already available. Structural timber technology isseriously reducing carbon emissions across our housinginfrastructure, and reducing energy bills for homeowners andtenants. Against this backdrop, the structural timber sector iswitnessing unprecedented demand for technically advancedoffsite manufactured solutions. It is therefore crucially importantto ensure that quality and safety standards, underpinned byrobust procedures, are at the top of the agenda of thoseoperating in the sector.

A responsible approachHowever, with opportunity comes responsibility, and this has neverbeen better communicated than as outlined in the Hackitt Review.Dame Judith castigated the UK construction industry for its ‘lowestcost’ culture and insisted we need to be more collaborative andbetter integrated using digitalisation to be able to manage ourassets. She insisted we place far more emphasis on quality. I amproud to say that this quality journey is something the STA hasbeen on for many years. Back in 2016 we developed a Membership and Quality

Standards Scheme – STA Assure was launched early the next yearand the initial accreditation was based on an online self-assessmentdeclaration process. To add further standing and credibility to thisinitiative, at the beginning of 2018, STA Assure became amandatory independently audited scheme. Its purpose is to inspireconfidence in our industry and means that our customers can relyupon members to do the job properly. It has been particularlyrewarding to receive widespread stakeholder endorsement from allthe major warranty providers including NHBC, LABC Warranty,Premier Guarantee, Protek Warranty, Build-Zone Warranty,Self-Build Zone Warranty and ABC+ Warranty.The STA Assure programme does not just cover the factory

operations, but also extends to how structures are installed. Thisyear saw manufacturing members make a firm commitment tousing only accredited erectors that have completed the TimberFrame Competency Award Scheme. The assessment also includes abespoke Offsite Award winning Site Safe audit – validating CDMcompliance and Health & Safety Executive requirements for theprotection and registration of timber structures duringconstruction. This audit ensures that design and productionprocesses and quality controls are in line with the customer’sexpectations for consistent, high levels of quality with continuousimprovement at the heart of the manufacturer’s culture. Carried out by skilled assessors, the audit process is designed to

be in-depth, supportive and informative. Not only does theindependent audit validate the design, manufacturing and productrealisation processes which offers reassurances to customers, it is

particularly beneficial to promote areas of excellence and setstandards for best practise principles.STA Assure creates a clear distinction in the expected

performance levels of member and non-members within thestructural timber arena. By providing transparency, credibility andaccountability, the STA safeguards the interests of end users,enabling them to partner with reputable member companies thatwill harness the multitude of inherent benefits that structuraltimber offers.

Andrew Carpenter is chief executive at the Structural Timber Association

Fortunately, we do not have to invent the solutions to develop energy efficient,low-carbon homes. We just need to makebetter use of what is already available

HOUSINGThe Government, plus industry funders, insurers and stakeholders, together withcontractors, housebuilders and clients, recognise the role timber has to play in thisvital sector of the industry

11COMMENT



Situated just a stone’s throw away fromLake Léman on one side, hugging theFrench border, and the Swiss Jura on

the other, the village of Le Vaud is shroudedin natural beauty. It was this setting thatpredicted the commune’s requirement for,above all, a sensitively packaged solution toits intensifying shortcomings in publicamenity space. In 2013, the commune’slocal government opened the project up tocompetitive tender, paving the way forLausanne and Zurich-based practiceLOCALARCHITECTURE’s first contactwith the client.In addition to demands for additional

space, the commune also wanted the designto make use of as many locally availablematerials as possible. Beyond that, entrieswere relatively free to experiment, explainsSaurer: “Because it was a competition, theygave us a very small brief. We were veryfree to create something new and feel free,so each of the six projects submitted werevery different.” He continues: “The questionof integration was key, though.” Accordingto the architect, it was the studio’s sensitivedesign and placement of the project intosite and surroundings that secured theirselection to lead the design. What distinguishes Le Vaud’s new

building from other villages is its uniquestory. Following initial completion in 2016

and one month before the building’sopening, Le Vaud’s Polyvalent Hall wasentirely destroyed by a calamitous fire.While the event was a huge blow, itserved to bring the architects, client – inparticular Chantal Landeiro, president ofthe commune – and the local inhabitants,closer together. As a result of this, thearchitects gained a more profoundunderstanding of the client’s needs;essential to further fine-tuning certainaspects of the design for the rebuild.

A child-friendly formThe plot is situated adjacent to a pathwhich also provides access to theneighbouring village church and cemeteryto the west and a school sports field to thenorth. A concrete forecourt acts as a visualmarker for the hall’s entrance, and buffer tothe road. Further removed are smallerresidential units, largely in concord with therural architectural language in that part ofthe world. In plan, the building takes on a near

rectangular shape measuring roughly36 metres by 40 metres, however theeastern side of the building is marginallylonger at both ends, forming a trapezium.The simple plan is balanced by the hall’srelatively complex form characterised bytwo pitched roofs of varying height and

Challenged by steep topography, unspoilt alpinesurroundings, and a devastating fire after its initialconstruction, the creation of a community sports andactivity hall brought architect, client and locals together inthe Swiss village of Le Vaud. Sébastien Reed speaks toarchitect Laurent Saurer

Climb every mountain

POLYVALENT HALLLE VAUD, SWITZERLAND

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width made up of seven planes which,according to the architects, make the scaleof the building appear “ambiguous andabstract”. A chimney structure alsoprotrudes from the roof, nodding to thecottage typologies found in the region.

“Questions of form were veryimportant,” says Saurer. In terms of scale,the architects wanted the building to be“something within the measure of a child.”It was important that the building’s masswere restrained; firstly, to better integrate itinto the village, which is made up of smallbuildings, and secondly, so it wouldn’tappear intimidating to the youngerdemographic that make up a significantportion of users. The team was also keenfor the building to react to the nearbymountains, and decided to orient therooflines in parallel with the topography.The result “looks, in a way, like part of thelandscape,” remarks Saurer.

Drawing lines between the new hall andits context and as part of the client’s brief,the architects specified only local materialsfor Le Vaud’s new hall, with its exteriorshrouded primarily in agricultural steel, likethat used for farmhouses and agriculturalbuildings throughout the Swiss Jura.Triangular sections of slatted pine appear tosprout up from the building’s east and westelevations, providing a shading system tothe triangular window beneath, while thesame slatted timber frames expanses ofglazing recessed into the mass of thebuilding right across the north and southelevations. Here, far-reaching views of theJura mountains to the north, and MontBlanc to the south are captured for users.

Uninterrupted space“The interior works with the topography,too,” says Saurer, “with some roomshidden underground.” The concreteforecourt doubles up as the roof slab ofsome of the accommodation on the lowerground floor of the building, housingnumerous amenities such as lavatories,plant, small function rooms, a kitchen area,and storage areas for chairs, tables, andother equipment.

One of the client’s requestswas to incorporate asmuch local material intothe building’s constructionas possible

14 POLYVALENT HALL, LE VAUD



Set adjacently to the south of thesedug-out spaces, the multifunctional sportshall is situated on the same floor. A stage isbuilt into the body of the western wall toprovide the necessary facilities for localsto enjoy live spectacles. An upper groundfloor level acts as a balcony area spanning18 metres by 16 metres which overlooks thehall from the northern side, as well asfunctioning as an entrance lobby for theentire building. Users can move easilybetween floors via a staircase on the northeastern side of the plan, providing access tothe storage and plant rooms below.

Structurally, the hall’s mass is supportedby the load-bearing walls of the roof gableswhich allowed the architects to keep asmuch interior space as possibleunobstructed. Aside from a minimaltwo-beam truss at the central ridge betweenthe two pitched roofs, the interior iscompletely open plan. “You can walk40 metres without encountering anypillars,” remarks Saurer. In order toaccommodate the various sporting activitiesand events programmed for the hall, theform of the interior shell deliberatelydiverges from that of the external envelope.Saurer explains: “Whereas the exteriorreacts to the natural and built context, wedesigned the interior to best fit the norms ofmany different sports and activities.”

The studio also worked in closecollaboration with lighting designer EtienneGillabert, who was particularly invested inminimising the clutter when it came to lightfittings. “A traditional multipurpose hallwould have a large light on the ceiling, butin this project,” says Saurer, “we gatheredall the lights to the main beam to emphasisethe structure and offer a kind of purity.”80 spots, one every square metre, form alighting grid which evenly illuminates thehall. Natural ventilation services the largespaces through hand-operable windowsand openings on the north and southelevations which are situated to align withthe prevailing winds in the region, while thesmaller rooms on the lower ground floorbenefit from mechanical ventilation.

Alpine sourceWith one of the client’s requests being toincorporate as much local material into theconstruction as possible, the architects hadonly to look to the nearby alpine regionfor inspiration. “White pine is a verywell-known Jura wood,” explains Saurer,“it’s very resistant and often used byfarmers, so it was very natural to use inthis context.”

15POLYVALENT HALL, LE VAUD



Timber elements on the outside are treatedwith Lasure varnish, which will allow thewood’s hue to fade gradually as it ages.“Currently,” says Saurer, “the exteriortimber is a light orange colour, but thewood will eventually fade to grey, whichwill compliment the grey and black steelplate material on the rest of the building.It’s the natural life of the wood.”White pine is used almost exclusively

throughout the interior, constituting boththe walls and ceilings. The wood is treatedwith a UV protective solution on the inside,helping maintain the wood’s bright colourand keeping the internal spaces light-fillednaturally. Also conscious of the noiseexpected from large swathes of childrenplaying and the hosting of local functions,keeping acoustics under control was also apriority for the design team who, inresponse, specified a lightweight timbersolution – Lignatur. The prefabricated Lignatur elements

incorporate cavities and perforationswhich not only provide acoustic treatmentfor the hall, but structure and thermalinsulation too, all the while cutting downon the amount of material required due totheir hollow design. The result, in Saurer’swords: “You don’t get the impression ofbeing in a sports hall. It’s more like atraditional stable, transformed into acontemporary object.”The primary sustainability benefit of

using white pine comes from the reducedtransportation costs that go hand in hand

with specifying locally sourced materials.Naturally, the white pine also locks insignificantly more carbon compared tosome other choices, a contributing factor tothe scheme’s Passivhaus certification. “Wethink that every building should be verywell insulated and should correspond tocertifications,” says Saurer.

Reaping the rewardsSetting aside the fire that ravaged thefirst construction in July 2016 and thesoul-searching that followed, Saurer says themost difficult part of the project “was theinstallation of the main beam over thesports hall.” The U-shaped ridge beam of themain hall incorporates all the technicalequipment required for sports activities suchas rings, movable basketball hoops, andlighting, which leaves the hall ceiling freefrom any visible technology. Between thesemain beams, secondary structures made ofLignatur panels support the roof. Becauseof the size of the main beam – measuring2 metres thick and 40 metres long, it alsohad to be split in two for transportationpurposes, then reassembled on site. The completed project has been

awarded the Swiss award DistinctionRomande d’Architecture 2019 and the2019 International Wood Prize, as well asreceiving an honourable mention by PrixLignum, a Swiss co-operative promotinginnovation in timber design.Notwithstanding industry accolades, for theclient and Le Vaud itself, its Polyvalent Hallwill have a far greater impact as a placewhere the community gathers andinnumerable beneficial experiences are had.When building the second time round,

only minor changes to internal fixtureswere made, making the end product and theoriginal design submission very similar.When asked if he would change anythingabout the final design, Saurer responds witha resounding “no.” He expands: “In a way,we’ve had the luck to do this twice. I thinkthe project is incredible.” �

TIMBER TREATMENTThe timber elements on the exterior have been treatedwith Lasure varnish, which will allow the wood’s hue tofade gradually as it ages from light orange to grey All images © Matthieu Gafsou

PROJECT FACTFILE

Architects: LOCALARCHITECTURE(Laurent Saurer, Manuel Bieler, Antoine Robert-Granpierre)Wood engineer: Ratio Bois Sàrl, ÈcublensCivil engineer: 2M ingénierie civileSA, Yverdon-les-BainsCVS engineer: Weinmann-EnergiesSA, ÈchallensLighting: Etienne Gillabert, Paris,Aebischer & Bovigny, LausanneGeometric engineer: Bovard & Nickl SA, NyonClient: Commune of Le VaudBuilt area (footprint): 1,209 m²Volume: 9,207 m³

You don’t get theimpression of being in asports hall. It’s more like a traditional stable,transformed into acontemporary objectLaurent Saurer

16 POLYVALENT HALL, LE VAUD



Based in Taunton, Somerset, the newheadquarters for the UKHydrographic office has reached

completion, as what’s claimed to be aunique timber-enhanced construction thatprovides an inspiring workspace for oneof the world’s leading marine geospatialinformation agencies. The 11,000 m2 building was created to

deliver a specific vision of openness andmovement, both in terms of its architectureand its functionality for its users. This hasbeen realised as an open plan, collaborativeenvironment, with key emphasis placed on

increasing the ability of the staff to worktogether and choose how they do so,all within a healthy environment thatheightens productivity. At three storeys tall, the building

includes a range of amenities, includinghigh specification office space, a staffrestaurant, a gym, and meeting facilitiesfor the Government agency.

A collaborative relationshipThe UKHO wanted to replace its formerbuildings in Taunton, which were inefficientand expensive to maintain. As such, the

UK HYDROGRAPHIC OFFICETAUNTON

BUILDINGPROJECTS

The UK’s official agency for shipping and Royal Navy data has a new headquarters inSomerset, designed to push collaboration to the fore, in an open and fluid structureenhanced by timber throughout. Jack Wooler reports on how the AHR-designed projecthelps workers engage in a ‘one team culture’

All hands on deck


T


agency was looking to create anenvironmentally friendly new home foritself, which, as well as bringing financialbenefits, they hoped would provide the upto date technology infrastructure andworking conditions necessary to enable theorganisation to sustain its long-term future. Employed to enact this vision were

architects AHR, engineers Hydrock, costconsultant Mace, and main contractorBAM, with the budget for the new officebeing met by the UKHO from businessreceipts as a self-funding agency. AHR, awarded the design services

contract in 2016, was reportedly chosen forits significant experience working on similarprojects, in particular a new headquartersfor Bath and North East Somerset Council– which had won a number of awards,including ‘The best of the best’ award 2015from the British Council for Offices.

From the outset, there was an extremelyclose collaborative working relationshipbetween the client and the practice, bringingUKHO staff into the design process andallowing the agency and its workers tocontribute to the vision and eventual feel ofthe building.When the practice first discussed the

proposal with the client, Adam Spall, regionaldirector at AHR, explains that the UKHO’saspiration was for “a ‘one team’ culture.” Spall explains how they approached

this, telling that it was vital to create a“physical and visual connection betweenall parts of the building,” which resulted “inan impressive sense of openness for such alarge facility.”With this open facility now being

completed, its success is testament to thecollaborative approach undertaken. This isevidenced by its deliverance to an ambitious

OPEN PLANThe building’s interior is an open, collaborative environment for the agency’s staff to interact in

18 UK HYDROGRAPHIC OFFICE, TAUNTON



timescale – completing exactly three yearssince initial work began in January 2016.

The speedy build process was enabled inlarge part by BAM, who achieved this bysplitting the project into two phases, whichallowed the car park construction requiredby the UKHO to be undertaken while thedesign and costing were completed for theheadquarters building itself.

Agile workspaces The building is in the main constructedas a system of two large interconnectedfloorplates, which bend gently in acontrolled geometry in constant motion.

These two floorplates are connected onthe ground floor by a dramatic 800 m2

atrium. The fluid motion of the floorplatesis continued in this space, with timberpanels running along the twisted lineardesign. Looking upwards from the groundfloor here, users see curving timberelements, adding to the sense of fluidity,ample daylighting coming between themfrom rooflights covering the atrium roof.

Connecting both sides physically andvisually on the first floor are openbalconies and bridges. The central atrium’slarge staircases lead users up to theselevels, which provide access to the twosymmetrically placed wings.

The occupants are encouraged to engagewith this atrium as they move aroundthe building, with provisions created forstimulating and creative encountersbetween colleagues. To facilitate this,there is a gradient of activity types withbreakout and social spaces within theatrium, including collaborative and agileworkspaces around the balcony edges onthe first floor, and individual deskingtowards the perimeter.

Arranged around the atrium on bothsides are the rest of the building’s variousamenities, including 700 desks acrossflexible work spaces, broken down into10 smaller neighbourhoods with a range ofwork settings, including team tables,‘scrum’ areas (as part of the agile workingconcept), height adjustable desks and quietwork zones.

These wide open working environmentswere a vital step in meeting the client’sbrief, creating the feeling that workersare all as part of the same space, able tointeract and co-work with each other tomake up a workforce that is moreenergised and synchronised to achieve theirdaily tasks – with acoustic and lightingbarriers allowing for more private spaceswhere necessary.

This brief was intended by the agency topromote a cultural shift within the UKHOitself, prioritising the wellbeing andfunctionality of the 850 members off staffworking in the building. As such, itrequired a building which cultivates thiskind of collaboration, and provides amodern way of working with the ability toaccommodate future business needs – andthe design and engineering behind the newbuilding allowed this to be achieved bothsubtly and efficiently.

CURVING BAFFLESThe ceiling of the atrium includes curving larch bafflesto enhance the feeling of fluidity and contribute toacoustic control

19UK HYDROGRAPHIC OFFICE, TAUNTON



C

Structure & designThe structural engineering design forthe site is based on a concrete flat slabstructure, chosen to fit the grid shape ofthe building, and for effective thermal massand services distribution.

Hydrock’s structural design solutionensures that, by day, heat generated bypeople and IT is absorbed in slab. At night,the vents then open up, allowing the heat toleave the building. The resulting exposedsoffits have been designed in order to fitinto the aesthetics of the structure itself.

Another interesting piece of structuralengineering is the atrium, which is coveredwith 203 rooflights. The unique V-shapedpre-cast concrete beams that form thegutter to the atria roof support thisextensive array – the beams spanning10.5 metres to 16 metres. According toHydrock, the advantage of using pre-castconcrete beams is that no access isneeded inside the building for repair ormaintenance, while on the outside it ispossible to stand in the gutter to clean theroof lights.

Dermot Parkinson, project manager atBAM, explored the construction of theatrium further: “The atrium roof showcasesour use of innovative, modern methodsof construction within the delivery of thisnew headquarters.”

He continued: “Designed as a kit ofprecast concrete elements and cast off-siteonly 5 miles away, it was installed using a300-tonne crane in just 6 weeks. The200 modular rooflights were installedsafely from above, without the need forscaffolding and delivered significanttime efficiencies.”

The facades are a key part of thisconsidered structural design, the brickwork including 600 mm long bricks andhorizontal larch panels which reinforce thelinear concept that is present in all aspectsof the design. This natural wood and brickfinish conceals the concrete smoothly, andjoins together precisely.

The holistic design concept of boththe exterior and the building’s interiorreportedly took inspiration from thehydrographic office’s work, following thetheme of ‘Seabed to Surface,’ with imagesof strata, contours and water currentinfluencing the aesthetic design throughout.This has been highly thought-out, with abespoke artwork and graphics packagehaving been developed with UKHO staff tofollow this theme.

These bespoke graphics cover muchof the building’s interior functionality,carried through the signage, the ITfacilities, lockers, furniture, and thegraphics identifying a room’s purpose, suchas for meeting.

Throughout the design process, the teamaspired to a high level of specification,always exceeding the ‘minimum standard’in order to ensure the building is highlydurable, agile, and will deliver for decadesto come.

The whole project was modelled to BIMLevel 2, with detailed inputs from the BAMsupply chain that ensured all the exposedservices were fully coordinated. This wasachieved in part by the simple palette ofmaterials employed, as well as early inputof the supply chain – all in order to createa robust and well detailed building thatcould deliver a high quality throughout –and to a deadline.

WellbeingThe brief was largely structured aroundnot just the functionality of the building forits users, but on the wellbeing of theemployees, and the necessity to achieve thisin a highly sustainable, low energy format.

Being central to the design ethos, theteam has succeeded in this throughthe adoption of a robust approach tosustainability, and by utilising natural lightand ventilation sources where possible.

SCREENSTimber screening is found throughout the workplaces

20 UK HYDROGRAPHIC OFFICE, TAUNTON



AWARDSThe project has won several RIBA awards since itscompletion at the start of 2019

Thermal comfort models wereundertaken by Hydrock to ensure that thisventilation strategy was sufficient to meetcurrent and future climate demands, whilemeeting workers’ wellness needs.

Chris Bowie-Hill, technical director atHydrock, says that this adoption, “with theheadquarters prioritising the wellbeing ofthe staff,” has enabled the building’s usersto “be in control of their environment andaccess to fresh air on demand.”

This is exemplified in the BuildingManagement System which controls theopening and closing of the top half ofevery window in the building, withoccupiers able to control the opening of thebottom half to give them an immediatesense of control over their environment –while the overall temperature of thebuilding remains automated.

Copious amounts of natural daylightingcompliments this ventilation, owed to theporous atrium and the 3.5 metre floor toceiling heights, which both allow forsignificant levels of glazing, helping toreduce the need for artificial lighting.

Another aspect of wellbeing particularlyimportant in an office space is noisedistractions. The sinuous larch clad baffleshanging from the atrium roof – atriabeing areas that attract echo – are key inproviding acoustic absorption. According toHydrock, the acoustic design allows theworkers to be able to comfortably speak ata normal volume throughout the open planoffice environment. Alongside this – thebaffles being an integral part of the passiveenvironmental design – they also eliminateglare to the offices below by diffusing lowangle sun.

As a result of the services strategyemployed, the sustainable, low energyoperation of the building means that thecosts for installing, operating andmaintaining fans, pumps and chillers weresignificantly reduced. This is helping topush the building’s standards, with theproject being on course to achieveBREEAM Excellent.

The project is also following theGovernment’s Soft Landings (GLS) process,which provides a post-handover period toenable the UKHO to get the best out of itsbuilding and optimise environmentalsystems for both the building’s expenses,and the workers’ wellbeing.

The GSL process is beneficial because,while moving into a custom built structureshould be a great experience, far too oftenthere is a large gap between what the clientexpects of a building and the end product.

The Government process promotes earlyengagement, providing a framework from‘before the beginning,’ where a constructionproject can fulfil a need, right up to annualpost occupancy evaluations for three yearsafter occupation to ensure the end users’needs are being met.

Strong receptionThe project has been extremely wellreceived by the wider community,including achieving the RIBA South WestAward 2019, the RIBA South WestSustainability Award 2019, and the RIBAAwards South West 2019 Winner of theCommercial Category.

The building’s users, too, have been vocalin their approval. Jo Funnell, new buildproject manager at UK HydrographicOffice, for example, lauds the project team’swork: “I am delighted with the outcome ofthe project and the standard of the building.The collaboration between all parties hasbeen the key to the project’s success.

“The new environment will supportsmarter ways of working at the UKHO,using new technology and modern officepractices, which is hugely exciting for ourbusiness. The design and quality of thebuilding is something we can all be veryproud of having delivered in Taunton.”

With critics and users happy with thebuilding, the AHR’s designs are set toprovide a significant legacy for the UKHydrographic Office – not just in termsof a striking and fluid use of timber andbrick, nor its porosity or heavy focus onwellbeing, but in its role as an exemplar inhow offices can be run; it is open, engaging,comfortable, and even inspirational. �

21UK HYDROGRAPHIC OFFICE, TAUNTON



All over the world we are surroundedby wooden structures of all ages,shapes and sizes. They range from

the ancient temples of Japan and oakframed medieval buildings of Europeconstructed from intricately jointed timberssometimes fixed with timber pegs, throughto more contemporary structuresconstructed from laminated timbers. Itsexcellent mechanical and thermal properties,beauty, ease of working and widespreadavailability has made timber the material ofchoice for construction across the centuries.

However, the popularity of timber inconstruction has placed huge pressure onthe planet’s natural resources. According tothe FAO (the forestry department of theUnited Nations), seven million hectares offorest were lost between 2000 and 2010,much of it for timber, but most foragriculture. Satellite monitoring has enableddeforestation to be monitored real-time justas we have become aware of the important‘eco-services’ forests provide, includingcarbon capture and storage.To help combat this problem, timber used

Dr Andy Pitman of Lignia Wood Company discusses how theUK timber industry is embracing change and innovating – forthe benefit of the environment and the customer

Modi�cation, innovation and sustainability

22



The versatility of modifiedwood means it’s applicableto almost all areas oftraditional woodworking, in both internal andexternal projects

to manufacture construction products isincreasingly sourced from sustainablymanaged forests. Timber qualifying forChain of Custody certification is harvestedfrom legal and well-managed forests andtimber is traceable from ‘forest through to product’; the Forest Stewardship Council (FSC) runs one such well-knownscheme. The industry has embraced certification and has worked to improve use of available resource.

Changing face of timberIn the past, where products were requiredto resist decay, be strong, stable, or beautiful, these were manufactured from asmall number of timbers possessing oneor more of these properties. For thisreason, many of these timbers have beenoverexploited and their continued use is nolonger sustainable. This led to a search formethods to improve the properties of morereadily available species.Timber modification provides a solution

to this issue. Studied since the early 20thcentury, wood modification technologiesstarted to be commercialised in the 1950s,competing at that time with high-valuetimbers, which had not been overexploited.Commercialisation re-emerged in recentyears, driven by need for alternatives tounsustainable tropical hardwoods. Modification differs from preservation in

that biocides are absent in the process. This is addressed in Callum A.S Hill’scomprehensive review text ‘WoodModification,’ in which he states that theprocess “should not release toxic substancesduring or at end-of-life”. Primarily, species to be modified are

sourced from rapidly-growing softwoodtrees from certified plantations resulting in an environmentally friendly, more-than-worthy alternative to its establishedpredecessor. The modification processimproves one or more properties. Theobjective is that these softwoods haveproperties that are valued, primarily for their beauty, durability, strength and stability. Currently a number of modification

technologies have been commercialised. Onesuch well-established method is acetylation, aform of chemical modification which altersbonding of water to wood, thus improving itsresistance to decay and stability. Another,thermal modification, as the name suggestsinvolves heating the wood to change itschemical structure and properties. An overarching benefit of these modified

woods is that they are, in a sense, ‘designed’

to have less variation in terms of theirproperties. There is stringent control overthe quality of materials used and in theprocess of manufacture. This is apparent inmodified woods’ resistance to decay. Thevariation of heartwood – the central woodof a tree – in a single species may vary inthe extreme dependent on the source ofthe material. The modification processsignificantly reduces this level of variation.

The future The versatility of modified wood means it’s applicable to almost all areas of traditional woodworking, in both internaland external projects. Its durability makes it ideal for cladding and exteriordecking, its stability and hardness for flooring and its aesthetic appeal andthermal properties have seen it used forbuilding interiors and furniture. Thesefactors are essential, and modificationtechnology means resources are nowplentiful and readily accessible. Ratherthan simply aiming to operate within theconfines of sustainability regulations,industry leaders can now look to create anenvironmental blueprint for the timbertrade for years to come. Manufacturers’ green credentials areunder the microscope now more than everand the market is set to grow exponentiallyin the coming years, as the demand forsustainable material ramps up. An increasein the variety of timber species available formodification is expected – including thosethat grow in the UK.

Dr Andy Pitman is technical director ofLignia Wood Company

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http://www.lignia.com/

24


Specialists in the design and construction of timber engineered products including:Decking, Balconies, Cladding, Buildings, Bridges, Walkways, Pontoons and Jetties

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Knowledge of fire protectionterminology in the design andbuild sector is woefully low.

That’s according to a recent survey ofarchitects by the Wood ProtectionAssociation (WPA). The findings of thissurvey came as no surprise to the TimberDecking and Cladding Association (TDCA),which has long held the view that poorspecification of preservative and fireprotection treatments leads to compromisedtimber performance.The TDCA and WPA exist to support

architects and specifiers in their correctchoice of timber. This specialist knowledgeand expertise must be embraced throughoutthe industry to ensure specifications arealways fit for purpose.

The extent of natural durabilityHow to correctly specify timber fordurability is a common question asked ofthe TDCA. Some timbers (mainlyhardwoods) offer natural durability. Theycan withstand outdoor and ground contactfor a determined service life without coatingor treatment.BS EN 350: 2016 provides durability

classifications for different timber species.There are five classes, Class 1 being themost durable. A table detailing the expectedservice life of different species for variouslocations can be found in BS8417 (theBritish standard for wood preservation).

When to specify preservative treated timberIf you’re intending to use a softwood timberoutdoors, some level of factory preservativetreatment will most likely be necessary. Foroutdoor use, timber is generally treated toUse Class 3 or 4 dependant on application,be it above or in ground contact.A proven method for decades, pressure

treatment involves impregnating thedecking or cladding timber with a woodpreservative (most commonly, copper-based). It’s a tightly controlled procedurewith checks for the level of treatment andhow far the preservative penetrates.BS8417 details the specific requirementsfor timber preservation.Not only will the right specification of

treatment achieve the desired service life, itwill also lock up carbon for longer andenable less durable timbers to be effectivelyused for longer-term applications; anenvironmental boon.Modified woods are a more recent

innovation gathering pace. They employprocesses that physically alter the timber

Janet Sycamore of the Timber Decking and Cladding Associationdiscusses why and how the details of timber protection needs to beembraced to ensure specifications are always fit for purpose

Is your timber speci�cation �t for purpose?

VODAFONE BUILDINGGlenalmond Abodo cladding to the building inChristchurch, New Zealand is made from thermallymodified softwood

25



to improve durability and many othercharacteristics. The result is a muchwider choice of materials for specifiersto consider.Documented evidence is available from

all accredited timber treatment providers.Architects must ask and retain this proof todemonstrate the product will meet theanticipated service life.

Getting to grips with improved fire performanceA risk assessment or Building Regulationsusually prompts the need for flameretardant treated timber. Fire (or flame)retardant treatments work by making thewood more difficult to ignite and byslowing the spread of flame, smoke andburning droplet generation, giving moretime for evacuation and lessening damageto the structure.Wood and wood-based panels are

generally treated to Euroclass C (limitedlateral spread of flame, like a BS476 class 1rating) or Euroclass B (very limited lateralspread of flame, like BS476 class 0).Treatment involves the impregnation oftimber under controlled conditions.The smoke rating will be given as an ‘s’

value, and the burning droplets rating as a‘d’ value.Classification Reports exist to verify

performance. They will detail timberspecies, thickness, substrate e.g.plasterboard, and whether the testedassembly incorporated an air gap or not.Deviation from any of these test specifics –e.g. thickness of the wood – will make theperformance certificate invalid.

When specifying flame retardant timber,always check the material description in theClassification Report against the material tobe used in your project. Species, size andintended use should match exactly. Onlythen do you have the right evidence toconfirm your product’s ability to performand to comply with the requirements ofBuilding Control officers or insurers.

CE marking and Declaration ofPerformanceTimber cladding and wood-based panelsare subject to CE marking. CE markingcompliance is the responsibility of theorganisation that brings cladding andpanels into the marketplace, and means theproduct must be accompanied by aDeclaration of Performance (DoP).Usually drawn up after treatment of a

wood product against fire, insist on acheck to ensure your specification matchesthe DoP. If you need more detail, ask for theproduct’s Reaction to Fire ClassificationReport. This is issued by an independentfire test certifying organisation suchas Exova.

Where to seek helpTimber treatment is a complex and essentialaspect of specification. By knowing whatyou’re looking for, and appreciating whatdocumentation should be available, you’llensure effective specification every time.The WPA has a series of fact sheets to

help you, in addition to a CPD accreditedcourse. Telephone helpdesks are available atboth the TDCA and WPA. When it comesto timber protection, there’s no reason tomake poor specification decisions.

Janet Sycamore is the director ofoperations at the Timber Decking andCladding Association

Timber treatment is acomplex and essentialaspect of specification. By knowing what you’relooking for, andappreciating whatdocumentation should beavailable, you’ll ensureeffective specificationevery time

EUROCLASSReaction to fire test results are expressed as Euroclass classifications to EN 13501-1

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The construction sector is thesecond largest consumer of plasticsbehind retail, however the industry is

now starting to focus on ways in whichit can improve its sustainability andgreen-credentials.A way in which this can be achieved is

replacing plastic and PVCu products,such as doors and windows, with timberalternatives. However, there is potentially areal danger of unintended consequencesfrom making the switch, especially if thereplacement products don’t reduce theenvironmental impact. One way in which to check the

sustainability of timber products is throughlife cycle analysis and EnvironmentalProduct Declarations, as well as chain ofcustody certifications. Technology can now be used to target the

tracking of timber as it moves through the

supply chain to guarantee authenticity ofthe timber’s origin, while other technologiesfocus on aggregating, analysing, visualisingand verifying supply chain information.However, both are still quite rare withinthe industry. More is now being done to highlight

the importance of using sustainableproducts within construction. The WWF(2020) accord on biodiversity has gainedsignificant traction within the EU, andhas resulted in stepped up efforts when itcomes to implementing strong natureand environmental laws, includingtimber logging. The new reality is that wooden windows

and doors are kinder to the environment,biodegradable and absorb CO2 from theatmosphere. Recent studies have found thatwhen properly protected with paint orwoodstain, timber windows and doors last

Gavin Knowles of Howarth Timber & Building Supplies on why scrutiny needs to beapplied to ensure correct product specification, which is also being applied to the industry

Looking past the uncertainty

29



twice as long as PVCu. Reducing thenumber of windows and doors that becomelandfill is good for the planet and theysport top-end, performance double glazing;ensuring that any loss of energy is furtherminimised – keeping heat inside the homewhere it is most beneficial.

Reaching new heightsOne area where timber products have comeunder particular scrutiny is cladding,following the Grenfell disaster. Newlegislation has shaped how timber claddingcan be used, with it no longer being allowedto be used more than 18 metres above theground.This has had a significant impactand means there is no definitive answer onthe next steps. What we do know is thatthe only materials allowed will be thoseclassed as A1 or A2 under the EuropeanReaction to Fire classification system, whichincludes materials such as metal, stone,glass and plasterboard.Any product that is combustible cannot

be used within anything classified as a newbuilding, while anything above 18 metreshas to be fully non-combustible, which willrule out all current timber products. Testing

is currently underway to try and find asolution which will allow timber productsto meet the new stringent fire regulations.

Timber doors make their mark While internal doors have nearly alwaysbeen timber, there has been a shift intorequiring an internal timber door that isboth sustainable and adds value andsaleability to new builds. Increasinglyspecified by leading housebuilders, doorssuch as the Suffolk door from HowarthTimber are chain and custody certified,while aesthetics can be significantlysuperior to pine or white moulded doors. Regarded as the new ‘wooden door

effect,’ this style of doors is proven to makea property more sellable, while offering it asan upgrade offers an extra revenue streamfor homebuilders. Available at threeseparate price points depending on thespecification level, even the most affordableoption still offers the same levels of greencredentials, giving peace of mind to boththe builder and their buyers.

Gavin Knowles is marketing manager atHowarth Timber & Building Supplies

Technology can now beused to target the trackingof timber as it movesthrough the supply chain toguarantee authenticity ofthe timber’s origin

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http://www.howarth-timber.co.uk/

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Brimstone poplar, the innovative,British-grown cladding from VasternTimber was the natural choice for

twelve affordable and sustainable homes in Shropshire.

The project required a timber claddingproduct that was British grown, durable andstable, and one with a lifespan of over 50years. Vastern Timber supplied 2,000m2 ofBrimstone cladding, produced from thermallymodified British grown poplar. Thanks to themodification process, Brimstone is ideal foroutdoor use and a great alternative toimported hardwoods. This beautiful claddinggreys naturally, helping the buildings to blendin with the landscape without the need forany ongoing maintenance.

Affordable, sustainable and locally-sourced Built to Passivhaus standards to reduceongoing fuel costs, these homes are at theforefront of sustainable residential

development. Commissioned by SouthShropshire housing association, they weredesigned by Architype, the award-winningsustainable architectural practice and built bySJ Roberts Construction. The homes sitcomfortably in their rural surroundings,thanks to the use of locally sourced naturalmaterials - including roof tiles from a nearbyquarry, locally produced lime render, andBrimstone poplar, a British-grown timbercladding.

Brimstone: thermally modifiedcladding Beautiful, versatile and modified to last,Brimstone is a new breed of thermallymodified timber for external applications.The natural, toxin-free modification process removes moisture, resin and otherextractives from the wood. The result is adurable, stable and consistent material – withClass 1 Durability and low risk of bending or warping.

Perhaps most importantly, Brimstone isproduced from the UK's own fast-growinghardwood species. Using homegrown wood helps to cut carbon emissions, but moreimportantly it supports the management ofour native woodlands. The Brimstone range is GIB certified, which means thatarchitects, builders and their clients can be sure of local provenance and goodwoodland management.

01793 853281 www.vastern.co.uk

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Historic building retains regal charmNumber One Queen Anne’s Gate is a prestigiousdevelopment of 27 luxury private residencessituated adjacent to St James’ Park in London.George Barnsdale’s experience of working withdifferent types of retained facade and steelframed systems was invaluable in managing

this fenestration project. A range of like for like timber sash andcasement windows were manufactured, some with single glazing andacoustic glass. Putty glazing beading and Grandis Hardwood doorswere recreated and installed to complement the existing door sets.Acoustic laminated glass was incorporated into the design.

01775 823000 www.georgebarnsdale.co.uk

High quality timber engineered productsEstablished in 2003, Deckbuilders UK Ltdare a leading member of the Timber Deckingand Cladding Association, designing andconstructing high quality timber engineeredproducts including: Decking, Balconies,

Cladding, Timber Buildings, Bridges, Walkways, Viewing Platforms,Pontoons and Jetties. The company offers a full design and installationservice, and can carry out a full survey, giving you assurance that youare working with experts who will carefully manage every aspect ofyour project up until the final sign off on site. Please call DeckbuildersUK Ltd if you have a project in mind.

0345 370 7790 www.deckbuildersltd.co.uk



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B&K Structures are not engineeredtimber purists. Our business modelfocuses on hybrid construction

solutions – however, CLT is by far the mostexciting revolutionary building material ofthe 21st century and will be significant in ourfuture development plans. Only now are wetruly realising the full capabilities of thisstrong, sustainable and technically advancedstructural solution and the new regulationswill not stifle innovation.

The UK has a magnificent heritage oftimber architecture dating back to thethirteenth century. We are now building onthis legacy using ground-breaking engineeredtimber systems. We develop high quality, low

carbon projects for a wide range of clientsthroughout the UK and through our robust,integrated supply-chain, B&K Structures arededicated to finding the best solution.

Putting the changes in to perspectiveChanges in the Building Regulations haverestricted the use of engineered timber inthe external wall elements over 18m, that iscirca six-storeys. To put the changes in toperspective, we have constructed in excess of50 cross laminated timber projects over thepast 15 years, of which only three would havefelt the impact of the regulatory change anda cost neutral wall solution would have beensimple to implement.

The engineered timber sector by its verynature, is founded on innovation – we arepioneers of sustainable construction and withmodifications, B&K Structures will ensurebuilding highly sustainable CLT structuresover six-storeys is not only possible but alsohighly practical.

The restriction applies to the external walls of residential accommodation, carehomes, hospitals and school dormitories over18m. The rest of the building including internal walls, floors and roof can therefore be formed in CLT. This equates toapproximately 80-90 per cent of the overallstructural frame.

In anticipation of the government

The Future of CLT Construction Buildings are the sum of many parts and we need a full portfolio of materials toachieve the best outcomes in terms of, performance, sustainability, safety, durability,efficiency and cost. Since the new Building Regulations came into force on21 December 2018, much has been written about cross laminated timber (CLT) –here Andy Goodwin shares with ADF how B&K Structures have planned for suchan event and have taken a pragmatic approach to embrace the new protocols


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announcement, we have been working inclose collaboration with our supply chainpartners to develop alternative through-wallsolutions that can be implemented with aprimary CLT superstructure.

Our non-combustible unitised wall panelsystems have been developed with leadingindustry supply chain partners. These systemsreplace the cross laminated timber elementsfrom within the external wall line with ahot rolled structural steel carrier frame andnon-combustible SFS infill wall panels,the remainder of the structural frame willbe constructed in CLT, which is totallycompliant with the regulatory changes.

As part of the research and developmentof these compliant solutions, carefulconsideration has been given to the designinterface between the CLT superstructure andthe SFS walling system. The SFS system andassociated connection details have beendesigned to take in to account increased loadcases attracted by traditional brickwork,heavier brick slip systems and balconylocations. Importantly the system is cost andprogramme neutral.

We have been instrumental in the development and growth of the CLT market in the UK, and through continuedcollaboration with our supply chain andindustry stakeholders, this will continue. The latest Building Regulations merelychange the way we construct the externalwalls to residential schemes above 18m. Wewill continue to work with our clients toensure that any new projects are designed anddelivered in accordance with the newBuilding Regulations.

Over the last 10 years CLT has beenemerging as a sustainable and cost-effectivebuilding material of choice and a vitalcomponent in the battle to reduce carbonemissions in the construction sector. We mustconsider the specification of materials whenconstructing large scale developments toensure we minimise the impact on theenvironment, not just for us but for the healthand wellbeing of generations to come.

Products and ServicesOperating since 1974, B&K Structures has worked with some of the UK’s renowned clients to develop outstandingbuildings with green credentials. For moreinformation on their product portfolio and full range of services, please contact the company.

01773 853 400 www.bkstructures.co.uk


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Val-U-Therm PLUS® wall panelsachieve 0.08 W/m2K – probably thebest U-value wall in the world.

Couple this with Scotframe’s expertise &track record and the sky really is the limitwhen it comes to design of buildings that tickall the boxes on your clients’ wish lists. Key to achieving this extraordinary

performance is that the insulation isinjected in off-site, quality-controlled factoryconditions. The foam expands into everynook and cranny, providing a best-in-classBR443 U-value correction factor of zero.As well as excellent thermal insulationperformance, details are available to minimisethermal bridging and give excellent airtight fabric levels.The Scotframe Val-U-Therm® building

system was originally launched in 2011 andhas been used in over 8,500 homes withan excellent track record. A UK marketleader in full timber frame packages for newhousing and commercial projects, Scotframeexclusively offers the Val-U-Therm PLUS®

closed panel building system. This is acceptedby financial institutions, NHBC, PremierGuarantee and Checkmate – the panels havea 60-year minimum service life.Because it’s a hybrid of the best aspects

of SIPS and timber frame technology,coupled with the latest advances in materialscience, it offers much flexibility andinnovation in the design and buildprocess. The unique combination of designopportunities includes:• Can be used for walls, roofs and floors• All types of design and architecture, evencurved walls and roofs

• Can be thermally engineered to performas an optimum combination

• Unrestricted elevational treatments –brick, stone, render, cladding, tile,timber, etc.

• All interior finishes and treatments• Large-span roofs with vaulted ceilings,if required

• Dramatic open-plan layouts offeringlifestyle flexibility

• Extensive glazed features anduninterrupted roof-space living areas

• BBA accredited building system, includingin-fill panels in other building systems

Couple this with its exceptional thermal

performance and sustainability, Val-U-Therm PLUS® provides a straightforward andcost-effective way for architects to hitenergy efficiency, air permeability and otherenvironmental targets. It offers a fit-and-forget, future-proof solution, whatever levelof environmental specifications are required– for example, ‘A’ rated Energy PerformanceCertificates, PassivHaus or the highest levelsof energy saving and carbon neutrality.The patented Val-U-Therm PLUS® is

also inherently sustainable due to carefulsourcing of raw materials with a minimalenvironmental impact. Scotframe’s timber issourced from FSC and PEFC sustainablymanaged forests and the insulation in Val-U-Therm PLUS® panels is based on renewablevegetable oil, has zero ozone depletionpotential and is CFC, HFC and HCFC-freewith a Global Warming Potential of less than5. This means it has a BRE Green GuideA/A+ Rating – the same as straw bales orsheep wool yet is hydrophobic offeringflood mitigation.From the UK’s first PassivHaus for rent

(which won a Green Apple Award) toexamples that significantly exceed thePassivHaus standard, Scotframe has beenleading the way using Val-U-Therm®

technology in energy efficient building formany years. The Maryville PassivHaus delivered a total

primary energy demand of 69 kWh/m2a(exceeding the PassivHaus requirement of120 kWh/m2a). This ‘Fabric First’ approach

is also suitable for commercial buildings – theRocking Horse Nursery at the University of Aberdeen, which caters for 78 pre-schoolchildren. achieved an air tightness of 0.475 ACH.Hence Scotframe homes and buildings are

warm and draught-proof in winter, cool andwell ventilated in summer, healthy for all thefamily and enjoy remarkably low energy bills.Scotframe Val-U-Therm PLUS® allows theconstruction of typical family homes that cancost less than £95 a year to heat. The great news is that building to these

high standards is not necessarily more expensive or time consuming using ScotframeVal-U-Therm PLUS®. Edinburgh NapierUniversity compared the cost per squaremetre of superstructure using 10 differentbuilding systems. Scotframe Val-U-Therm® cost £1092 when

built to PassivHaus standards, while the othernine systems ranged from £711 to £1138when built only to existing BuildingRegulations. It took 65 days to build aScotframe home to PassivHaus standards; theother 26 homes ranged from 49 to 126 daysto build, again only to Building Regulations. So, if you are looking to design a dream

home or superlative building – thinkScotframe Val-U-Therm PLUS®.Scotframe Timber Engineering and Val-U-

Therm are proud to be part of the SaintGobain Group of Companies.

01467 624 440 www.scotframe.co.uk

Design Flexibility & Performance from Scotframe


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Protect Membranes, UK producer ofconstruction and roofing membranes,has introduced two new waterproof

breather membranes designed for use externally on timber frame, SIPs and CLTwall panels, achieving a Class W1 resistanceto water penetration.

Launched in tandem with the STA AdviceNote 18 published by the Structural TimberAssociation and NHBC, the products are designed for buildings sited in severelyexposed locations which are typically high altitude, open to high winds and onwesterly coastal sites in England, Ireland,Wales and Scotland.

Protect Thermo Extreme is a low emissivity, insulating breather membranewith microporous film and microperforationtechnology to ensure high watertightness and vapour permeability. This protects theouter sheathing from moisture and allowsvapour to pass into the external wall cavity.Featuring a highly reflective surface, Protect

Thermo Extreme helps deliver low overall U-values when the foil faces into an unventilated airspace, achieving an agedthermal resistance R-value of 0.77m2K/W,incorporating printed branding.

Protect TF200 Extreme is a high performance membrane used on the cold sideof the insulated panel to minimise the risk ofinterstitial condensation, with microporousfilm technology to ensure high vapour permeability and exceed requirements recommended by TRADA and NHBC. Itoffers a temporary, first line of protection to

the whole of the external wall.John Mellor, Product Manager comments,

“We are delighted to introduce these twoproduct additions to meet the need for aClass W1 external wall membrane in severelyexposed areas, based on the new advice fromthe STA. With our market leading ProtectTF200 Thermo and TF200 ranges continuingto be used widely throughout the UK wherein the majority of cases Class W2 is acceptable as stated in STA Advice Note 18, it now means that we can offer a comprehensive range of membrane options to our customers throughout the UK and Ireland.”

Both membranes are CE marked, availableex-stock in 3m widths and 100m lengths and produced in the UK.

For more details, please [email protected].

0161 905 5700 www.protectmembranes.com

‘Extreme’ wall membranes deliver Class W1performance for severely exposed sites

Benefits of using CaberShieldPlusCaberShieldPlus, from Norbord, is a chipboardflooring panel, available in 18mm or 22mm,with a permanent waterproof, protective layeron the top and bottom of the panel. It has beenspecifically designed for construction when theroof still hasn’t been placed, or before the

building is watertight. With a permanent, waterproof coating on bothsides, the flooring is BBA-certified for exposure to construction workand the elements for up to 60 days when fixed with Caberfix D4adhesive. After work is complete, the floor can be wiped clean so thatit is ready for finishings such as carpet and laminate.

www.norbord.co.uk

Convenient and paper-freeEnjoy reading ADF but find it’s not alwaysconvenient to have the printed magazine?Or has your workplace turned paper-free?The Digital Issue offers you the samecontent, delivered straight to your inboxand accessible via smartphone, tablet and desktop computers. Be among the firstto read all the latest features, comment,interviews, and more, before the print

issue has even been delivered! What’s more, the Digital Issue includesinteractive links to featured companies. Subscribe for free now.

www.subscribepage.com/adf

Eco-friendly solution for timber fire treatmentExperts in timber treatment, WJ, have teamed-upwith an innovative Danish business to bring anatural and non-toxic fire retardant to the UK. Thecompany has invested in a new high-pressure timbertreatment and kiln drying facility. The treatmentperforms to the highest European fire standard;Euroclass B and retains an s1 smoke rating, meaning

the smoke emitted in a fire is greatly reduced and non-toxic in nature.Treatment certificates, classification reports and DoP’s are providedwith each job, documenting that the treatment meets the requiredEuropean fire classification, in accordance with EN 13510-1.

www.wj-group.co.uk

Rubio® WoodCream Rubio WoodCream is a 0 per cent VOC water-basedcream, that provides instant protection for yourvertical exterior wood and also makes wood waterrepellent. This water repellant character acts as aself-cleaning function that ensures less maintenanceand cleaning in the future. Due to the creamstructure, Rubio WoodCream is easy to apply,especially on vertical wood and also provides a

long-lasting pearl effect. Available in seven shades of grey as well as atransparent version. Rubio WoodCream is excellent for hard and softwood species. Order your Rubio WoodCream from Rubio Monocoat.

01827 59 041 www.rubiomonocoat.co.uk



www.rubiomonocoat.co.uk

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