Roof Details

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ACCREDITED CONSTRUCTION DETAILS (SCOTLAND) (FOR THE LIMITATION OF THERMAL BRIDGING AND AIR LEAKAGE IN LOW AND MEDIUM RISE DOMESTIC TYPE)

tatus of this document his document provides guidance on one way to meet some of the requirements of

he functional standards set out in Regulation 9 of the Building (Scotland) egulations. There is however no need to follow the guidance in this document, as

here are other ways of meeting the functional standards. Access to the Technical andbook is available on the website of the Scottish Building Standards Agency at ww.sbsa.gov.uk, and it may be downloaded free of charge.

---------------- ------------------- N

ackground mproved energy performaneflected in the Scottish buildeans that buildings are mfficiencies than ever befoonstruction that limits:

• air infiltration; and • heat-loss through junc

he Scottish Building Standaow to address these two isan arise. The details prebsolute levels of airtightnesre currently ventilated, but cceptable level. The detavailable and minimise theondensation. The arrangemondensation risk, to making uilding elements, where tra

evels that can be achieved w

his document provides two elected construction type ans also provided on associaelection of membranes, air in

imitations on use he details illustrated here d

ntended to provide sufficienerformance presented in thhow principles of constructirawn to scale. It should be nhown; it is acceptable to pould be, in the timber frame

-------------------------------1 INTRODUCTIO

ce measures for new construction work are now ing regulations. Achieving these standards generally

ore highly insulated and have better heating system re, whilst simultaneously retaining a good level of

tions in the fabric.

rds Agency recognise the need to provide guidance on sues, whilst at the same time avoiding the risks which sented in this document do not endeavour to attain s that will result in a change in the way that dwellings when followed with care will limit air infiltration to an ils can be built using the construction skills currently risk of both surface condensation and interstitial ents shown however go further than simply minimising a useful contribution to reduce heat-loss at junctions of ditionally it can be difficult to maintain the insulation ithin the elements themselves.

levels of guidance. Specific guidance related to each d on each construction detail. Supplementary guidance ted issues including the selection of insulation, the filtration and some examples of construction issues.

o not form part of the Technical Handbooks but are t information to enable users to achieve the level of ese documents. These details are generic in nature, on and for this reason they are not dimensioned, nor oted that not all permutations of thermal insulation are rovide multiple layers of insulation. Examples of this wall an additional layer of insulation with a preserved

cavity may be provided to the outside of the sheathing board, or in the masonry cavity wall an insulated lining board may be installed in addition to the cavity insulation. All details are suitable for use in domestic type buildings up to six storeys high. Details are provided for the most common construction types:

• masonry walls with external insulation • masonry cavity walls with full fill insulation • masonry cavity walls with partial fill insulation • masonry walls with internal insulation • timber frame walls • steel frame walls • miscellaneous junctions, e.g. door thresholds and roof windows.

AimThe main aim in providing these details is to illustrate a ready means:

• to manage thermal loss (to reduce energy requirement) • to avoid interstitial condensation (which can damage construction) • to avoid surface condensation (which can lead to mould growth and endanger

health) • to limit air leakage (to reduce energy requirement) • to prevent rain penetration (which can damage construction and endanger

health). The common factors which are illustrated in each detail are:

• the position of insulation (to limit thermal bridging) • the position and extent of ventilation (to control condensation) • the position and the different performance characteristics of the building

membranes (to manage air and vapour movement and to prevent water entering the building)

• the position and type of cavity closers and cavity barriers (to minimise air movement and in the case of the latter, to provide fire resistance). Where these are proprietary types, it is assumed for the purposes of these details that they incorporate a DPC which is capable of directing moisture away from the inside of the building.

Other requirements of the Scottish building regulations which are not illustrated by these details, but which should be considered by the designer include:

• thermal performance of elements (U-values) • structural • fire resistance and flame spread • ventilation (of rooms) • airborne and impact noise (including flanking sound) • damp-proofing arrangements.

Supplementary Guidance

Selection of Insulation The selection of insulation material and the choice of thickness of insulation to be provided will be influenced by a number of factors which are determined by the building procurer and the designer (e.g. architectural features). These fall outwith the scope of this publication. In terms of construction of elements the key issues are a combination of the following:

• thermal transmittance (U-value) recommended in Scottish building regulations • thermal conductivity of the insulation material • thermal performance of the ‘non-insulating’ part of the construction (e.g.

linings and structural components) • interaction of the insulation material and the remainder of construction (e.g.

insulation position in relation to ventilation of the element or bridging of insulation by fixings).

The U-value calculation is outwith the scope of this document. Guidance on how this can be done and the other options available are in Section 6 of the Technical Handbooks. Layers of differing insulation materials Where different types of insulation are used within a construction, it is recommended that the insulation nearest to the outer surface of the construction be the least resistant to the passage of water vapour. This is to reduce the possibility of condensation forming in between the insulation layers. For example, where mineral wool is used in conjunction with polystyrene board, the mineral wool should be the outer layer. Where it is essential that the outer layers of insulation has a higher vapour resistivity than the inner layer then condensation risk analysis should always be carried out. Selection of Membranes The details illustrate the location and characteristics of the membranes related to their function in resisting water, water vapour or air. These characteristics are fundamental to the success of the construction and selection of the correct membrane should be made with care. Vapour control layer A vapour control layer should be used:

• principally to reduce the spread of water vapour throughout the construction element, where condensation can do harm to the building materials.

• as a secondary function to improve the airtightness of the building fabric.

Typically this layer is provided on the inside face of the insulation in, timber or steel frame walls, rooms in roof spaces, flat roofs and it may be incorporated as an integral part of a proprietary wall lining board A vapour control layer is a material with a vapour resistance greater than 200 MN·s/g.

Vapour permeable or breather membrane A vapour permeable or breather, water-resistant membrane should be used:

• as a primary protection to vulnerable construction materials from the harmful effects of precipitation during the construction process; and

• as a secondary protection to vulnerable construction materials from the harmful effects of precipitation, throughout the life of the building; and

• to allow water vapour to escape from vulnerable construction materials that would otherwise be entrapped due to lack of ventilation.

Typically this layer is provided on the outer face of the inner leaf of a timber frame wall or above sarking insulation where the space between the tiles or slates is ventilated. In the case of the former the membrane has a vapour resistance of no more than 0.6 MN·s/g and in the case of the latter, it has a vapour resistance of no more than 0.25 MN·s/g. Non-vapour permeable roofing membrane A non-vapour permeable, water-resistant roofing membrane should be used:

• as a primary protection to vulnerable roof construction materials from the harmful effects of precipitation during the construction process; and

• as a primary protection to vulnerable roof construction materials from the harmful effects of precipitation, for example the covering to a built-up felt flat roof directly above the insulation; and

• as a secondary protection to vulnerable roof construction materials from the harmful effects of precipitation, for example as a roof tile underlay where the roof space is ventilated above the insulation.

This type of layer has a vapour resistance of more than 0.25 MN·s/g. Sequence of construction Some of the details presented in this document can only be followed effectively if consideration is given to the sequence of construction. This is important with regard to the placing of insulation materials and particularly where insulation needs access from two sides to allow correct positioning. An example of this is at the eaves of a roof where it may be necessary to fit the insulation which links the wall and roof insulation before the soffit boards are fitted. Dense Block For the purposes of this document a dense block is one with a thermal conductivity greater than 0.7 W/mK. Thermal Conductivity (lambda - λ ) Thermal conductivity is a measure of a material’s ability to conduct heat. It is measured in W/mK and is the quantity of heat (in Watts) which will pass through 1 square metre of the material 1 metre thick for each degree difference in temperature between one side of the material and the other. Any quoted thermal conductivity of a given material is, therefore, independent of its thickness.

Air infiltrationThe details shown in this document contain measures designed to reduce air infiltration. This depends on the form of construction and the level of workmanship but the objective is to form a definable, continuous air barrier around the dwelling. Ways of preventing air infiltration should then be considered at every penetration of this barrier. Particular care on site should be paid to:

• joints between structural components e.g. wall to floors • joints around components and opening within walls • service penetrations – plumbing, electrical and ventilation.

General

• close any vertical ducts at the top and bottom where they meet the air barrier (e.g. boxing round soil vent pipe’s)

• seal any service penetrations through the air barrier • select the appropriate sealant or gap filler for the size of gap and degree of

movement anticipated.

Masonry Construction • ensure continuous ribbons of adhesive are used to fix to dry lining at

perimeters of external walls, openings, and services on external walls. The importance of correct sealing of dry lining on dabs needs to be stressed, as this is a key area of infiltration and can seriously affect the overall ventilation rate

• use joist hangers to support floor joists • seal under skirting boards where dry lining is used, or on suspended floors.

Timber Frame

• ensure DPC’s are turned up behind sole plates and lap with vapour control layers; alternatively seal with mastic or a gasket between the DPC and sole plate

• place bead of mastic on timber floor deck before positioning wall panels (timber ground floors and intermediate floors)

• ensure ‘sheet’ vapour control layers are properly lapped at junctions, and/or, • ensure any vapour control plasterboard is jointed in accordance with the

manufacturer’s instructions • always return vapour control layers into door and window reveals, head and

sills • cut vapour control layers tight to electrical outlets and seal at piped service

penetrations, (with tape or sealant as appropriate) • ensure all breather control membranes overlap each other and are stapled in

place.

Steel Frame • all joints between rigid insulation boards be lapped or sealed with tape

approved by insulation manufacturer • ensure ‘sheet’ vapour control layers are properly lapped at junctions, and/or, • ensure any vapour control plasterboard is jointed in accordance with

manufacturer’s instructions • always return vapour control layers into door and window reveals, heads and

sills • cut vapour control layers tight to electrical outlets and seal at piped service

penetrations. Examples of some common construction issues Poorly positioned cavity insulation The cavity wall insulation should be installed tight to the outer face of the inner leaf. This will prevent air circulation between the block and insulation reducing the performance of the insulation layer. Debris bridging the cavity Clear all debris including mortar droppings from the cavity as work progresses to prevent cold bridging occurring between the inner and outer leaf. Insulation cut short of the cavity closers Ensure that cavity insulation is cut to suit boards/batts that tightly butt against each other and against surrounding cavity closers and loose fill insulation. Service Penetrations Service penetrations should be core drilled to minimise damage to the insulation layer and facilitate remedial air sealing. Any damage caused to the insulation layer by penetrations through the air barrier should be made good following their installation. This can be achieved by filling any large gaps with loose fibrous insulation, expanding foam insulation and sealing with a thin mastic fillet. This includes behind bath panels, shower trays, kitchen units and into service shafts. Socket outlet/ switch plates Where the air barrier is formed by a plasterboard lining it is recommended that a continuous ribbon of adhesive is applied around the hole prior to installing the plasterboard. This will reduce air leakage through the sockets/ switches into the void beyond. Proprietary gasketed socket boxes and membranes are also available where required. Window and door frames Air leakage is often found to occur between window/door frames and the surrounding construction. Mastic seals are often required between plaster finishes, window boards and frames.

Recessed light fittings Recessed light fittings may permit air leakage where they breach the plasterboard ceiling line into the voids or lofts beyond. They should only be allowed to penetrate the primary air barrier if the units are of an air sealed type or a further secondary air barrier is formed beyond. Extract fans Termination of extract fan ducts should be installed and sealed to prevent air leakage occurring through plasterboard finishes. Where appropriate a continuous ribbon of adhesive should be installed around the penetration. Where possible the ducts should also be sealed to any masonry inner leaf. Extract fans may also be fitted with external flaps to minimise air infiltration through the unit. Stairs Plaster finishes are typically omitted from voids below staircases. Air infiltration may then occur through mortar joints in poor quality masonry into the externally ventilated wall cavities. Plaster finishes should be installed below stairs or a thin render/parge coat shoul be applied to the surface of the masonry. Dormers in room in roof The plasterboard linings surrounding the dormer will form the air barrier. Care should be taken to ensure that the linings form a continuous air barrier and are fully sealed to the window frames.

Section 1 Introduction and Supplementary Guidance Section 2 2.00 Masonry: External Wall Insulation Link 2.01 Pitched Roof, Ventilated Roofspace, Eaves Link 2.02 Pitched Roof, Ventilated Roofspace, Gable Link 2.03 Pitched Roof, Ventilated Rafter Void, Eaves Link 2.04 Pitched Roof, Ventilated Rafter Void, Gable Link 2.05 Pitched Roof, Ventilated Batten Void (warm roof), Eaves Link 2.06 Pitched Roof, Ventilated Batten Void (warm roof), Gable Link 2.07 Timber Flat Roof Link 2.08 Timber Flat Roof with Parapet Link 2.09 Lintel at Window Head Link 2.10 Windows and doors, Jambs and sills Link 2.11 Ground Bearing Floor, Insulation Above Slab Link 2.12 Ground Bearing Floor. Insulation Below Slab Link 2.13 Raft Foundation Link 2.14 In-situ Suspended Ground Floor Slab Insulation Above Slab Link 2.15 In-situ Suspended Ground Floor Slab, Insulation Below Slab Link 2.16 Concrete Beam and Block Suspended Ground Floor Link 2.17 Timber Suspended Ground Floor Link 2.18 Separating Wall Link 2.19 Concrete Intermediate Floor Link 2.20 Timber Intermediate Floor Link Section 3 3.00 Masonry: Cavity Wall Insulation: Full Fill Link 3.01 Pitched Roof, Ventilated Roofspace, Eaves Link 3.02 Pitched Roof, Ventilated Roofspace, Gable Link 3.03 Pitched Roof, Ventilated Rafter Void, Eaves Link 3.04 Pitched Roof, Ventilated Rafter Void, Gable Link 3.05 Pitched Roof, Ventilated Batten Void (warm roof), Eaves Link 3.06 Pitched Roof, Ventilated Batten Void (warm roof), Gable Link 3.07 Timber Flat Roof Link 3.08 Timber Flat Roof with Parapet Link 3.09 Windows and doors, Lintel Link 3.10 Windows and doors, Folded Lintel Link 3.11 Windows and doors, Independent Lintel Link 3.12 Windows and doors, Jambs and sills Link 3.13 Ground Bearing Floor. Insulation Above Slab Link 3.14 Ground Bearing Floor, Insulation Below Slab Link 3.15 Raft Foundation Link 3.16 In-situ Suspended Ground Floor Slab, Insulation above Slab Link 3.17 In-situ Suspended Ground Floor Slab, Insulation Below Slab Link 3.18 Concrete Beam and Block Suspended Ground Floor Link 3.19 Timber Suspended Ground Floor Link 3.20 Separating Wall Link 3.21 Concrete Intermediate Floor Link 3.22 Timber Intermediate Floor Link

Section 4 4.00 Masonry: Cavity Wall Insulation: Partial Fill Link 4.01 Pitched Roof. Ventilated Roofspace. Eaves. Link 4.02 Pitched Roof. Ventilated Roofspace. Gable Link 4.03 Pitched Roof, Ventilated Rafter Void, Eaves Link 4.04 Pitched Roof, Ventilated Rafter Void, Gable Link 4.05 Pitched Roof. Ventilated Batten Void (warm roof). Eaves. Link 4.06 Pitched Roof, Ventilated Batten Void (warm roof), Gable Link 4.07 Timber Flat Roof Link 4.08 Timber Flat Roof with Parapet Link 4.09 Lintel at Window Head Link 4.10 Windows and doors. Folded Lintel Link 4.11 Windows and doors. Independent Lintel Link 4.12 Windows and doors. Jambs and sills Link 4.13 Ground Bearing Floor. Insulation Above Slab Link 4.14 Ground Bearing Floor. Insulation Below Slab Link 4.15 Raft Foundation Link 4.16 In-situ Suspended Ground Floor Slab, Insulation above Slab Link 4.17 In-situ Suspended Ground Floor Slab, Insulation Below Slab Link 4.18 Concrete Beam and Block Suspended Ground Floor Link 4.19 Timber Suspended Ground Floor Link 4.20 Separating Wall Link 4.21 Concrete Intermediate Floor Link 4.22 Timber Intermediate Floor Link Section 5 5.00 Masonry: Internal Wall Insulation Link 5.01 Pitched Roof, Ventilated Roofspace, Eaves Link 5.02 Pitched Roof. Ventilated Roofspace. Gable Link 5.03 Pitched Roof, Ventilated Rafter Void, Eaves Link 5.04 Pitched Roof. Ventilated Rafter Void. Gable Link 5.05 Pitched Roof, Ventilated Batten Void (warm roof), Eaves Link 5.06 Pitched Roof, Ventilated Batten Void (warm roof), Gable Link 5.07 Timber Flat Roof Link 5.08 Timber Flat Roof with Parapet Link 5.09 Lintel at Window Head Link 5.10 Windows and doors, Folded Lintel Link 5.11 Windows and doors. Jambs and sills Link 5.12 Ground Bearing Floor. Insulation Above Slab Link 5.13 Ground Bearing Floor. Insulation Below Slab Link 5.14 Raft Foundation Link 5.15 In-situ Suspended Ground Floor Slab Insulation above Slab Link 5.16 Concrete Beam & Block Suspended Ground Floor Link 5.17 Timber Suspended Ground Floor Link 5.18 Separating Wall Link 5.19 Concrete Intermediate Floor Link 5.20 Timber Intermediate Floor Link

Section 6 6.00 Timber Frame Link 6.01 Pitched Roof, Ventilated Roofspace, Eaves Link 6.02 Pitched Roof. Ventilated Roofspace. Gable Link 6.03 Pitched Roof, Ventilated Rafter Void, Eaves Link 6.04 Pitched Roof, Ventilated Rafter Void, Gable Link 6.05 Pitched Roof, Ventilated Batten Void (warm roof), Eaves Link 6.06 Pitched Roof, Ventilated Batten Void (warm roof), Gable Link 6.07 Timber Flat Roof Link 6.08 Timber Flat Roof with Parapet Link 6.09 Lintel at Window Head Link 6.10 Windows and doors, Jambs and sills Link 6.11 Ground Bearing Floor, Insulation Above Slab Link 6.12 Ground Bearing Floor, Insulation Below Slab Link 6.13 Raft Foundation Link 6.14 In-situ Suspended Ground Floor Slab. Insulation Above Slab Link 6.15 Concrete Beam and Block Ground Floor Link 6.16 Timber Suspended Ground Floor Link 6.17 Separating Wall Link 6.18 Timber Intermediate Floor Link 6.19 Wall junction Link Section 7 7.00 Steel frame Link 7.01 Pitched Roof, Ventilated Roofspace, Eaves Link 7.02 Pitched Roof. Ventilated Roofspace. Gable Link 7.03 Pitched Roof, Ventilated Rafter Void, Eaves Link 7.04 Pitched Roof, Ventilated Rafter Void, Gable Link 7.05 Pitched Roof, Ventilated Batten Void (warm roof), Eaves Link 7.06 Pitched Roof, Ventilated Batten Void (warm roof), Gable Link 7.07 Timber Flat Roof Link 7.08 Timber Flat Roof with Parapet Link 7.09 Lintel at Window Head Link 7.10 Windows and doors, Jambs and sills Link 7.11 Ground Bearing Floor, Insulation Above Slab Link 7.12 Ground Bearing Floor, Insulation Below Slab Link 7.13 Raft Foundation Link 7.14 In-situ Suspended Ground Floor Slab. Insulation Above Slab Link 7.15 Concrete Beam and Block Ground Floor Link 7.16 Timber Suspended Ground Floor Link 7.17 Separating Wall Link 7.18 Timber Intermediate Floor Link 7.19 Wall junction Link Section 8 General Arrangements 8.00 For future development Link 8.01 For future development Link 8.02 Roof Window, Ventilated Rafter Void Link 8.03 Roof Window. Ventilated batten Void (Warm Roof) Link 8.04 Roof Window. Ventilated batten Void (Warm Roof) Link 8.05 Level Threshold, Insulation above Slab, Ramped Access Link 8.06 Level Threshold, Insulation below Slab, Ramped Access Link 8.07 Level Threshold, Timber Floor, Ramped Access Link 8.08 Ceilings, Services Penetrations Link

plaster or plasterboard on dabs

solid masonry wall(any type)

cladding(render finish shown)

externally applied insulation system, various fixing methods (see BRE publication Thermal Insulation: avoiding risks - BR262 to establish where it can be used avoiding technical risk)

Revision E

2.00 Masonry: External Wall Insulation

This detail is a constituent component of the SBSA, Technical Guide : Accredited Construction Details (Scotland) and should be used only after reference to the introduction and the supplementary guidance where the relevance and any limitations on the use of this detail are set out.

Masonry: External Wall Insulation2.01 Pitched Roof, Ventilated Roofspace, Eaves

proprietary cross flow ventilator to maintain

minimum 25mm air gap

lap roof and wall insulation, minimum 50mm thickness at

narrowest pointconsider sequence of construction,

see supplementary guidance

roofing membrane

continuous ribbon of plaster adhesive, sealing joint between wall and ceiling board

ventilation gap equivilent to 10mm minimum continuous opening is

required where the roof pitch is above 15°

orventilation gap equivilent to

25mm minimum continuous opening is required where the

roof pitch is below 15°,insect mesh should be installed

Revision F

Read in conjunction withMasonry: External Wall InsulationPitched Roof, Ventilated Roofspace, Gable

ventilation gap equivalent to 5mm minimum continuous opening at ridge is required where the roof pitch is greater than 35° or the roof span is more than 10m

sarking board

restraint required for insulation, for example metal banding, wire

mesh or similar material, fixed between rafters


Masonry: External Wall Insulation2.02 Pitched Roof, Ventilated Roofspace, Gable


insulation between last truss and gable wall

Revision C

Read in conjunction withMasonry: External Wall InsulationPitched Roof, Ventilated Roofspace, Eaves


30 minute fire resistingcavity barrier


proprietary cross flow ventilator to maintain minimum

25mm air gaproofing membrane

inhabited space

where two insulation types are used together see supplementary guidance

Masonry: External Wall Insulation2.03 Pitched Roof, Ventilated Rafter Void, Eaves

Revision E

Read in conjunction withMasonry: External Wall InsulationPitched Roof, Ventilated Rafter Void, Gable

ventilation to roofspace

sarking board

ventilation gap equivalent to 5mm minimum continuous opening at ridge is required

50mm air gap

sarking board




vapour control layer

ventilation gap equivilent to 25mm minimum continuous

opening,insect mesh should be installed




lap roof and wall insulation, roof insulation to be

compressed between sarking and wall head


Revision E

wall insulation should be taken up level with

top of gable

Masonry: External Wall Insulation2.04 Pitched Roof, Ventilated Rafter Void, Gable

Read in conjunction withMasonry: External Wall InsulationPitched Roof, Ventilated Rafter Void, Eaves

fill gaps at top of gable masonry with mortar to

form an even surface

50mm ventilation path over insulation



sarking boardroofing membrane


Masonry: External Wall Insulation2.05 Pitched Roof, Ventilated Batten Void (warm roof), Eaves.

ventilation to batten void


proprietary over fascia ventilator



lap roof and wall insulationminimum 50mm

consider sequence of construction, see supplementary guidance

vapour permeable membrane with a vapour resistance of not more than

0.25 MN.s/g

support insulation between rafters on battens or clips

inhabited space

Revision F

Read in conjunction withMasonry: External Wall InsulationPitched Roof, Ventilated Batten Void (warm roof), Gable


ventilation gap equivalent to 5mm minimum continuous opening is required at ridge rigid insulation as sarking

restraint required for insulation, for example

metal banding, wire mesh or similar material, fixed

between rafters


vapour permeable membrane (with a vapour resistance of not

more than 0.25 MN.s/g)


ventilation to tile batten void


compressed between sarking insulation and wall head

Revision E


insulation between rafters supported on battens or clips

ensure insulation is placed between gable wall and last rafter

Masonry: External Wall Insulation2.06 Pitched Roof, Ventilated Batten Void (warm roof), Gable

Read in conjunction withMasonry: External Wall InsulationPitched Roof, Ventilated Batten Void (warm roof), Eaves


rigid insulation as sarking

wall insulation should be taken up level with top of gable





Revision F

vapour control layer turned up edge of roof insulation, lapped with roof waterproofing layer,

and sealed

fix full height blocking piece and tightly pack mineral wool

into void and under deck

consider sequence of construction, see supplementary

guidance

roofing membrane


Masonry: External Wall Insulation2.07 Timber Flat Roof

declevity piece


roofing membrane



Revision E


and sealed

minimum distance 300mm between top of edge

insulation and bottom of roof insulation

place 20mm strip of insulation with thermal conductivity (value) not exceeding 0.025W/mK around parapet

flashing minimum 150mm above finish roof level

Masonry: External Wall Insulation2.08 Timber Flat Roof with Parapet

render or impervious cladding

declevity piece

roofing membrane


lintel of any type

15mm strip of insulation with thermal conductivity ( value)

not exceeding 0.025W/mK between packing pieces

Revision D

continuous ribbon of plaster adhesive, sealing joint between wall and board

sealant to back of framesealant to front of frame

Masonry: External Wall Insulation2.09 Lintel at Window Head The same thermal principles apply at the head of doors

damp proof course


wall insulation carried up to underside of sill

sealant to front and back of frame/sill

plan view

Revision E


section view

Masonry: External Wall Insulation2.10 Windows and doors, Jambs and sills

15mm strip of insulation with thermal conductivity ( value) not exceeding 0.025W/mK between packing pieces

15mm strip of insulation with thermal conductivity ( value) not exceeding 0.025W/mK between packing pieces


continuous ribbon of plaster adhesive, sealing joint between

wall and board

damp proof course

damp proof course


wall insulation continued at least 150mm below top of

floor insulation

Revision F

vapour control layer under timber floor finish

damp proof membrane above or below slab

damp proof course

external ground level

Masonry: External Wall Insulation2.11 Ground Bearing Floor, Insulation Above Slab

mastic seal

20mm strip of perimeter insulation with thermal conductivity ( value) not exceeding 0.025W/mK should be installed around any screed

continuous ribbon of plaster adhesive, sealing joint

between wall and board


Revision F


floor insulation

damp proof membrane

damp proof course


Masonry: External Wall Insulation2.12 Ground Bearing Floor. Insulation Below Slab

mastic seal 20mm strip of perimeter insulation with thermal conductivity ( value) not exceeding 0.025W/mK around slab and any screed




Revision F



floor insulation

damp proof course

damp proof membrane

Masonry: External Wall Insulation2.13 Raft Foundation

20mm strip of perimeter insulation with thermal conductivity ( value) not exceeding 0.025W/mK around slab and any screed

mastic seal





Revision F



floor insulation

damp proof course

damp proof membrane

Masonry: External Wall Insulation2.14 In-situ Suspended Ground Floor Slab Insulation Above Slab

mastic seal





Revision F



perimeter insulation

damp proof course

damp proof membrane

20mm strip of perimeter insulation with thermal conductivity ( value) not exceeding 0.025W/mK should be installed around slab and any screed

Masonry: External Wall Insulation2.15 In-situ Suspended Ground Floor Slab, Insulation Below Slab

mastic seal

dense blocks should not be used below slab





sub floor ventilation should be provided, minimum 1500mm ² per metre run of external wall or 500mm ² per m ² floor area

Revision F

damp proof course



floor insulation damp proof membrane

solum

Masonry: External Wall Insulation2.16 Concrete Beam and Block Suspended Ground Floor

mastic seal

N.B. 20mm strip of perimeter insulation with thermal conductivity (value) not exceeding 0.025W/mK should be installed around any screed




insulation directly under flooring - supported either on battens or on netting draped over joists and stapled at required depths

Revision F

damp proof course



floor insulation

sub floor ventilation should be provided, minimum 1500mm ² per metre run of external wall or 500mm ²per m ² floor area

expanding foam and continuous sealant

20mm strip of perimeter insulation with thermal

conductivity ( value) not exceeding 0.025W/mK should be

installed between wall and last joist

solum

Masonry: External Wall Insulation2.17 Timber Suspended Ground Floor

mastic seal floor joist ends supported on joist hangers or using scarcement wall

continuous ribbon of plaster adhesive sealing joint between wall and board

damp proof membrane


plan view

Revision C

Masonry: External Wall Insulation2.18 Separating Wall



wall insulation continued across floor zone

gaps between wall and floor sealed

Revision D

Masonry: External Wall Insulation2.19 Concrete Intermediate Floor


separating floors require additional layers and components to comply with Section 2: Fire and Section 5: Noise



Revision D


Masonry: External Wall Insulation2.20 Timber Intermediate Floor

separating floors require additional layers and components to comply with Section 2: Fire andSection 5: Noise




inner leaf (block shown)

outer leaf (brick shown)

full fill cavity wall insulation(see BRE publication Thermal Insulation: avoiding risks - BR262 to establish where it can be used avoiding technical risk)

3.00 Masonry: Cavity Wall Insulation: Full FillRevision C

render finish if required/desired


Masonry: Cavity Wall Insulation: Full Fill3.01 Pitched Roof, Ventilated Roofspace, Eaves



lap roof and wall insulation, minimum 50mm thickness at narrowest pointconsider sequence of construction,


roofing membrane


Revision E

Read in conjunction withMasonry: Cavity Wall Insulation: Full FillPitched Roof, Ventilated Roofspace, Gable

ventilation gap equivalent to 5mm minimum continuous opening at ridge is required where the roof pitch is greater than 35° or the roof span is more than 10msarking board


required where the roof pitch is below 15°

orventilation gap equivilent to 25mm

minimum continuous opening is required where the roof pitch is 15°

or above

insect mesh should be installed

cavity closer (thin calcium silicate board or similar)




Masonry: Cavity Wall Insulation: Full Fill3.02 Pitched Roof, Ventilated Roofspace, Gable

Revision D

Read in conjunction withMasonry: Cavity Wall Insulation: Full FillPitched Roof, Ventilated Roofspace, Eaves



continue wall insulation to top of gable or alternatively 270mm above

bottom of ceiling tie and insert cavity tray






inhabited space


Revision E

sarking board


50mm air gap

sarking board





Masonry: Cavity Wall Insulation: Full Fill3.03 Pitched Roof, Ventilated Rafter Void, Eaves

Read in conjunction withMasonry: Cavity Wall Insulation: Full FillPitched Roof, Ventilated Rafter Void, Gable

ventilation gap equivilent to 25mm minimum continuous opening

insect mesh should be installed cavity closer (thin calcium silicate board or similar)





Revision E




sarking board

Masonry: Cavity Wall Insulation: Full Fill3.04 Pitched Roof, Ventilated Rafter Void, Gable

Read in conjunction withMasonry: Cavity Wall Insulation: Full FillPitched Roof, Ventilated Rafter Void, Eaves





top of gable



roofing membrane


Masonry: Cavity Wall Insulation: Full Fill3.05 Pitched Roof, Ventilated Batten Void (warm roof), Eaves

Read in conjunction withMasonry: Cavity Wall Insulation: Full FillPitched Roof, Ventilated Batten Void (warm roof), Gable



30 minute fire resisting cavity barrier


lap roof and wall insulationminimum 50mm thickness at



vapour permeable membrane(with a vapour resistance of no more

than 0.25 MN.s/g)


inhabited space

Revision E







between rafters



Revision E






Masonry: Cavity Wall Insulation: Full Fill3.06 Pitched Roof, Ventilated Batten Void (warm roof), Gable

Read in conjunction withMasonry: Cavity Wall Insulation: Full FillPitched Roof, Ventilated Batten Void (warm roof), Eaves




compressed between sarking insulation and wall head

wall insulation should be taken up level with top of gable



vapour permeable membrane (with a vapour resistance of not

more than 0.25 MN.s/g)



Revision E


and sealedfix full height blocking piece and tightly pack mineral wool



guidance

roofing membrane


Masonry: Cavity Wall Insulation: Full Fill3.07 Timber Flat Roof

declevity piece



roofing membrane



Revision E


and sealed

minimum distance 300m between top of edge





declevity piece

Masonry: Cavity Wall Insulation: Full Fill3.08 Timber Flat Roof with Parapet

roofing membrane


Revision E

steel lintelcontinuous baseplate

steel lintelperforated baseplate

sealant to back of frame


sealant to front and back of frame

sealant to front of frame


Masonry: Cavity Wall Insulation: Full Fill3.09 Windows and doors, Lintel


not exceeding 0.025W/mK

N.B. in certain circumstances the lintel will require fire resistance - check with lintel manufacturer

weep hole taken through render



folded steel lintel

no baseplate

folded steel lintel

Revision E

continuous baseplate

sealant to front of frame sealant to front and

back of frame



Masonry: Cavity Wall Insulation: Full Fill3.10 Windows and doors, Folded Lintel

15mm strip of insulation with thermal conductivity ( value) not exceeding 0.025W/mK






insulation brought down to window opening and cavity closed

cavity tray with a minimum upstand of 140mm and stop ends

any lintel type can be used

Revision D

sealant to back of framesealant to front of frame


Masonry: Cavity Wall Insulation: Full Fill3.11 Windows and doors, Independent Lintel



sealant to front and back of sill

plan view

Revision E



Masonry: Cavity Wall Insulation: Full Fill3.12 Windows and doors, Jambs and sills

insulation between packing pieces


section view

insulation between packing pieces


continuous ribbon of plaster

adhesive, sealing joint between wall

and board

damp proof course

damp proof course



floor insulation

Revision E

damp proof course


Masonry: Cavity Wall Insulation: Full-Fill3.13 Ground Bearing Floor. Insulation Above Slab







Masonry: Cavity Wall Insulation: Full Fill3.14 Ground Bearing Floor, Insulation Below Slab


floor insulation

damp proof course

damp proof membrane

Revision E




Revision E




damp proof course

damp proof membrane

Cavity Wall Insulation: Full Fill3.15 Raft Foundation





Revision E



floor insulation

damp proof course

damp proof membrane

Masonry: Cavity Wall Insulation: Full Fill3.16 In-situ Suspended Ground Floor Slab, Insulation above Slab

20mm strip of perimeter insulation with thermal conductivity ( value) not exceeding 0.025W/mK around any screed



Revision E




damp proof course

damp proof membrane


Masonry: Cavity Wall Insulation: Full Fill3.17 In-situ Suspended Ground Floor Slab, Insulation Below Slab






Revision E

damp proof course




solum

Masonry: Cavity Wall Insulation: Full Fill3.18 Concrete Beam and Block Suspended Ground Floor



cavity barrier type sleeve through cavity



Revision E

damp proof courseexternal ground level


floor insulation

sub floor ventilation should be provided, minimum 1500mm ² per metre run of external wall or 500mm ² per m ²floor area

expanding foam and continuous sealant


conductivity ( value) not exceeding 0.025W/mK should be

installed between wall and last joist

solum

Masonry: Cavity Wall Insulation: Full Fill3.19 Timber Suspended Ground Floor

floor joist ends supported on joist hangers or using scarcement wall


damp proof membrane



plan view

Revision D

plan view

Masonry: Cavity Wall Insulation: Full Fill3.20 Separating Wall





Revision D

Masonry: Cavity Wall Insulation: Full Fill3.21 Concrete Intermediate Floor





Revision D


Masonry: Cavity Wall Insulation: Full Fill3.22 Timber Intermediate Floor







partial fill cavity wall insulation

Revision C


4.00 Masonry: Cavity Wall Insulation: Partial Fill


Masonry: Cavity Wall Insulation: Partial Fill4.01 Pitched Roof. Ventilated Roofspace. Eaves.

Revision D



lap roof and wall insulation, minimum 50mm thickness at narrowest pointconsider sequence of construction,


roofing membrane



sarking board





roof pitch is 15° or above


30 minute fire resisting cavity barrier (thin calcium silicate board or similar)

Read in conjunction with Masonry: Cavity Wall Insulation : Partial Fill, Ventilated Loft, Gable.




Masonry: Cavity Wall Insulation: Partial-Fill4.02 Pitched Roof. Ventilated Roofspace. Gable.


Revision C

continue wall insulation to top of gable or stop wall insulation 270mm above bottom of ceiling tie

place loft insulation between last truss and gable wall

Read in conjunction withMasonry: External Wall InsulationPitched Roof, Ventilated Roofspace, Eaves




inhabited space


Masonry: Cavity Wall Insulation - Partial Fill4.03 Pitched Roof, Ventilated Rafter Void, Eaves Revision E

ventilation gap equivalent to 25mm minimum continuous

opening


50mm air gap

sarking board


narrowest point - considersequence of construction






Read in conjunction withMasonry: Cavity Wall Insulation: Partial FillPitched Roof, Ventilated Rafter Void, Gable

restraint required for insulation, for example metal banding, wire mesh or similar material, fixed

between rafters


Revision DMasonry: Cavity Wall Insulation: Partial Fill4.04 Pitched Roof, Ventilated Rafter Void, Gable





sarking board

Read in conjunction withMasonry: Cavity Wall Insulation: Partial FillPitched Roof, Ventilated Rafter Void, Eaves





top of gable



roofing membrane


Masonry: Cavity Wall Insulation: Partial Fill4.05 Pitched Roof. Ventilated Batten Void (warm roof). Eaves.

Revision C





inhabited space



Read in conjunction withMasonry: Cavity Wall Insulation: Partial FillPitched Roof, Ventilated Batten Void (warm roof), Gable





vapour permeable membrane(with a vapour resistance of no more

than 0.25 MN.s/g)




metal banding, wire mesh or similar

material, fixed between rafters


vapour permeable membrane (with a vapour resistance of no more than 0.25 MN.s/g)


Revision D




Masonry: Cavity Wall Insulation - Partial Fill4.06 Pitched Roof, Ventilated Batten Void (warm roof), Gable

Read in conjunction withMasonry: Cavity Wall Insulation - Partial FillPitched Roof, Ventilated Batten Void (warm roof), Eaves







top of gable





Revision D

vapour control layer turned up edge of roof insulation, lapped with roof waterproofing layer

and sealed




guidance

roofing membranevapour control layer

Masonry: Cavity Wall Insulation - Partial Fill4.07 Timber Flat Roof


declevity piece


roofing membrane



Revision E


and sealed



place 20mm strip of insulation with thermal conductivity ( value) not exceeding 0.025W/mK around parapet


Masonry: Cavity Wall Insulation - Partial Fill4.08 Timber Flat Roof with Parapet


declevity piece

roofing membrane


Revision C



Masonry: Cavity Wall Insulation: Partial Fill4.09 Lintel at Window Head

note that the same principal applies at the head of doors

steel lintelcontinuous baseplate

steel lintelperforated baseplate




15mm strip of insulation with thermal conductivity (

value) not exceeding 0.025W/mK


N.B. in areas of extreme exposure, a cavity tray type damp proof course will be applied on top of the lintel - check with lintel manufacturer




Masonry: Cavity Wall Insulation: Partial-Fill4.10 Windows and doors. Folded Lintel




Revision C


N.B. in areas of extreme exposure, a cavity tray type DPC will be applied on top of the lintel - check with lintel manufacturer

steel lintelsteel lintel with continuous base plate







Masonry: Cavity Wall Insulation: Partial-Fill4.11 Windows and doors. Independent Lintel

any lintel types can be used

insulation brought down to window opening and cavity closed

cavity tray with minimum upstand of 140mm and stop ends




Revision B




Masonry: Cavity Wall Insulation: Partial Fill4.12 Windows and doors. Jambs and sills

plan view

Revision D




insulation brought to underside of sill and 30

minute fire resisting proprietary fire /

insulating cavity barrier incorporating damp proof

course


insulation brought to window frame and 30 minute fire resisting proprietary fire /

insulating cavity barrier incorporating damp proof course


continuous ribbon of plaster adhesive, sealing joint between

wall and board

section view

damp proof course

damp proof course



floor insulation

Revision C


damp proof course


Masonry: Cavity Wall Insulation: Partial Fill4.13 Ground Bearing Floor. Insulation Above Slab


N.B. 20mm strip of perimeter insulation with thermal conductivity ( value) not exceeding 0.025W/mK should be installed around any screed



Masonry: Cavity Wall Insulation: Partial Fill4.14 Ground Bearing Floor. Insulation Below Slab



floor insulation

damp proof course

damp proof membrane


continuous ribbon of plaster adhesive sealing joint between wall and wallboard

Revision C


Masonry: Cavity Wall Insulation: Partial-Fill4.15 Raft Foundation




damp proof course

damp proof membrane


Revision D



Masonry: Cavity Wall Insulation: Partial Fill4.16 In-situ Suspended Ground Floor Slab, Insulation above Slab




floor insulation

damp proof course

damp proof membrane

Revision D



Revision C




damp proof course

damp proof membrane


Masonry: Cavity Wall Insulation: Partial Fill4.17 In-situ Suspended Ground Floor Slab, Insulation Below Slab






Revision C

damp proof course




solum

Masonry: Cavity Wall Insulation: Partial Fill4.18 Concrete Beam and Block Suspended Ground Floor




Masonry: Cavity Wall Insulation: Partial-Fill4.19 Timber Suspended Ground Floor


damp proof courseexternal ground level


floor insulation


flexible insulation/expanding foam and continuous sealant

20mm strip of perimeter insulation with thermal conductivity ( value)

not exceeding 0.025W/mK should be installed between wall and last joist

solum


Revision B

continuous ribbon of plaster adhesive sealing joint


damp proof membrane



Masonry: Cavity Wall Insulation: Partial Fill4.20 Separating Wall

plan view

Revision B

plan view

damp proof course





Revision B

Masonry: Cavity Wall Insulation: Partial Fill4.21 Concrete Intermediate Floor




Masonry: Cavity Wall Insulation: Partial Fill4.22 Timber Intermediate Floor Revision B






plaster or plasterboard


internally applied insulation system (various fixing methods)

5.00 Masonry: Internal Wall InsulationRevision B









roofing membrane






roof pitch is 15° or above


Revision C

Read in conjunction withMasonry: Internal Wall InsulationPitched Roof, Ventilated Roofspace, Gable


sarking board


Masonry: Internal Wall Insulation5.01 Pitched Roof, Ventilated Roofspace, Eaves


between rafters




Revision A

Read in conjunction withMasonry: Internal Wall InsulationPitched Roof, Ventilated Roofspace, Eaves

Masonry: Internal Wall Insulation5.02 Pitched Roof. Ventilated Roofspace. Gable.


30 minute fire resisting cavity barriercontinuous ribbon of plaster adhesive, sealing joint between wall and ceiling board



inhabited space


Revision C

Read in conjunction withMasonry: External Wall InsulationPitched Roof, Ventilated Rafter Void, Gable

ventilation to roofspace

sarking board







opening


Masonry: Internal Wall Insulation5.03 Pitched Roof, Ventilated Rafter Void, Eaves


50mm air gap

sarking board


between rafters



Revision C

Read in conjunction withMasonry: Internal Wall InsulationPitched Roof, Ventilated Rafter Void, Eaves



sarking board

Masonry: Internal Wall Insulation5.04 Pitched Roof. Ventilated Rafter Void. Gable.




top of gable



roofing membrane



Masonry: Internal Wall Insulation5.05 Pitched Roof, Ventilated Batten Void (warm roof), Eaves.









vapour permeable membrane (with a vapour resistance of no more than

0.25 MN.s/g)


inhabited space

Revision C

Read in conjunction withMasonry: Internal Wall InsulationPitched Roof, Ventilated Batten Void (warm roof), Gable






between rafters


Revision C

Masonry: Internal Wall Insulation5.06 Pitched Roof, Ventilated Batten Void (warm roof), Gable

Read in conjunction withMasonry: Internal Wall InsulationPitched Roof, Ventilated Batten Void (warm roof), Eaves












30 minute fire resisting cavity barrier (thin calcium silicate

board or similar)



Revision C


and sealed




guidance

roofing membrane


Masonry: Internal Wall Insulation5.07 Timber Flat Roof

declevity piece



roofing membrane



Revision D


and sealed





Masonry: Internal Wall Insulation5.08 Timber Flat Roof with Parapet


declevity piece

roofing membrane


Masonry: Internal Wall Insulation5.09 Lintel at Window Head.

Revision C

The same thermal principles apply at the head of doors



steel lintel





weep hole taken through render 15mm strip of insulation with

thermal conductivity ( value) not exceeding 0.025W/mK


Masonry: Internal Wall Insulation5.10 Windows and doors, Folded Lintel

Revision C

The same thermal principles apply at the head of doors

folded steel lintel








not exceeding 0.025W/mK



Masonry: Cavity Wall Insulation: Partial-Fill5.11 Windows and doors. Jambs and sills

30 minute fire resisting proprietary

fire / insulating cavity barrier, incorporating

damp proof course

30 minute fire resisting proprietary fire / insulating cavity barrier, incorporating damp proof course


plan View

section view

Revision D

wall insulation carried up to underside of sill




damp proof course

continuous ribbon of plaster adhesive,

sealing joint between wall and board

15mm strip of insulation with thermal conductivity ( value) not exceeding

0.025W/mK


damp proof course


Masonry: Internal Wall Insulation5.12 Ground Bearing Floor. Insulation Above Slab


damp proof coursevapour control layer under timber floor finish


Revision D


flexible insulation /expanding foam

continuous ribbon of plaster adhesive applied to perimeter of wall


Masonry: Internal Wall Insulation5.13 Ground Bearing Floor. Insulation Below Slab


damp proof course

damp proof membrane


Revision D




Masonry: Internal Wall Insulation5.14 Raft Foundation


damp proof course

damp proof membrane


Revision D




Masonry: Internal Wall Insulation5.15 In-situ Suspended Ground Floor Slab Insulation above Slab

Revision D



damp proof membrane

damp proof course





Masonry: Internal Wall Insulation5.16 Concrete Beam & Block Suspended Ground Floor



damp proof course

damp proof membrane

Revision D

solum





continuous ribbon of plaster adhesive applied to perimeter

of wall


Masonry: Internal Wall Insulation5.17 Timber Suspended Ground Floor


external ground level solum sub floor ventilation should be provided, minimum 1500mm ² per metre run of external wall or 500mm ² per m ² floor area


Revision C


conductivity ( value) not exceeding 0.025W/mK

should be installed between wall and last joist



cavity barrier type sleeve through cavity and cavity

tray type damp proof course locally over sleeve

damp proof membrane


Masonry: Internal Wall Insulation5.18 Separating Wall

Plan View

Revision C

damp proof course



Masonry: Internal Wall Insulation5.19 Concrete Intermediate Floor



Revision C

insulation should be installed in cavity projecting minimum

100mm above and below floor zone (insulation may need to be

damp proof course faced in areas of severe exposure)

100mm

100mm



separating floors require additional layers & components to comply with Section 2: Fire and Section 5: Noise


Masonry: Internal Wall Insulation5.20 Timber Intermediate Floor

continuous ribbon of plaster adhesive, sealing joint between wall and boardseparating floors require additional layers & components to comply with Section 2: Fire andSection 5: Noise

Revision C


not exceeding 0.025W/mK continued accross floor zone




plasterboard

sheathing board


Revision B


6.00 Timber Frame


structural timber frame

insulation


cavity

stainless steel wall tie



cavity barrier giving 30 minute fire resistance - ensure cavity barrier is not breeched by inappropriate insulation material in timber frame

Timber Frame6.01 Pitched Roof, Ventilated Roofspace, Eaves






roofing membrane





roof pitch is below 15°


Revision D

Read in conjunction withTimber FramePitched Roof, Ventilated Roofspace, Gable


sarking board





Timber Frame6.02 Pitched Roof. Ventilated Roof Space. Gable


loft insulation continued up to sheathing of spandrel

panel

cavity barrier giving 30 minute fire resistance


Revision C

Read in conjunction withTimber FramePitched Roof, Ventilated Roofspace, Eaves





inhabited space


Timber Frame6.03 Pitched Roof, Ventilated Rafter Void, Eaves

Revision C

Read in conjunction withTimber FramePitched Roof, Ventilated Rafter Void, Gable

sarking board


50mm air gap






opening

insect mesh should be installed vapour control layer


cavity barrier giving 30 minute fire resistance - ensure cavity barrier is not breeched by inappropriate insulation material within timber frame




differential movement gap sealedwith compressible foam or sealant

cavity barrier giving 30minute fire resistance

50mm ventilation path over insulationlap roof and wall insulation, roof

insulation to be compressed between sarking and timber frame

Revision C

Timber Frame6.04 Pitched Roof, Ventilated Rafter Void, Gable

Read in conjunction withTimber FramePitched Roof, Ventilated Rafter Void, Eaves






Timber Frame6.05 Pitched Roof, Ventilated Batten Void (warm roof), Eaves.








vapour permeable membrane (with a vapour resistance of not more than

0.6 MN.s/g)

support insulation between rafters on netting, battens

or clips

inhabited space

Revision D

Read in conjunction withTimber FramePitched Roof, Ventilated Batten Void (warm roof), Gable


ventilation gap equivalent to 5mm minimum continuous opening is required at ridge to batten space


cavity barrier giving 30 minute fire resistance - ensure cavity barrier is not breeched by inappropriate insulation material within timber frame


vapour permeable membrane (with a vapour resistance of no more than 0.6 MN.s/g)restraint required for

insulation, for example metal banding, wire

mesh or similar material, fixed

between rafters




lap roof and wall insulation, roof insulation to be compressed between

sarking and timber frame

Revision C


insulation between rafters supported on battens, clips or netting

Timber Frame6.06 Pitched Roof, Ventilated Batten Void (warm roof), Gable

Read in conjunction withTimber FramePitched Roof, Ventilated Batten Void (warm roof), Eaves








Revision D


and sealed

eaves - fix full height blocking piece and tightly pack mineral wool into void and under deck

verge - tightly pack mineral wool into void over wall and under

deck (not shown)

roofing membrane


Timber Frame6.07 Timber Flat Roof

declevity piece


cavity barrier



guidance



Revision A


Timber Frame6.08 Timber Flat Roof with Parapet



vapour control layer turned up edge of roof insulation, lapped with roof waterproofing layer, and sealed

roofing membrane to be taken minimum 150mm above finished roof level

declevity piece



cavity barrier giving 30 minute

fire resistance


Revision E

Timber Frame6.09 Lintel at Window Head



vapour permeable membrane (with a vapour

resistance of no more than 0.6 MN.s/g)

The same thermal principles apply at the head of doors.

steel lintel





N.B. in areas of extreme exposure, a cavity tray type DPC will be applied on top of the lintel - check with lintel manufacturer alternative for heavy duty lintel







Plan View

Revision C

section view

Timber Frame6.10 Windows and doors, Jambs and sills




damp proof course

damp proof course vapour control layer


vapour permeable membrane (with a vapour resistance of

no more than 0.6 MN.s/g)



Revision D



damp proof course


Timber Frame6.11 Ground Bearing Floor, Insulation Above Slab

20mm strip of perimeter insulation with thermal conductivity ( value) not exceeding 0.025W/mK should be installed around any screedvapour permeable membrane

(with a vapour resistance of no more than 0.6 MN.s/g)


perpend vent



Timber Frame6.12 Ground Bearing Floor, Insulation Below Slab

damp proof course

damp proof membrane

Revision D



no more than 0.6 MN.s/g)vapour control layer

perpend vent




damp proof course

damp proof membrane

Revision E

Timber Frame6.13 Raft Foundation


no more than 0.6 MN.s/g) vapour control layer


perpend vent



Revision D


damp proof course

damp proof membrane

Timber Frame6.14 In-situ Suspended Ground Floor Slab. Insulation Above Slab



no more than 0.6 MN.s/g) vapour control layer

perpend vent




Revision C

damp proof course


damp proof membrane

solum

Timber Frame6.15 Concrete Beam and Block Ground Floor

20mm strip of perimeter insulation with thermal conductivity ( value) not exceeding 0.025W/mK should be installed around any screedvapour permeable membrane

(with a vapour resistance of no more than 0.6 MN.s/g)



perpend vent



Revision D

damp proof course

external ground levelsub floor ventilation should be provided, minimum 1500mm ² per metre run of external wall or 500mm ² per m ² floor area

expanding foam or continuous sealant

solum

Timber Frame6.16 Timber Suspended Ground Floor


no more than 0.6 MN.s/g)


damp proof membrane

perpend vent



Plan View

Revision D

Timber Frame6.17 Separating Wall

acoustic insulation not shown

cavity barriers giving 30 minute fire resistance, ensure cavity barriers are not breeched by inappropriate

insulation material in the timber frame alternative corner details,

see Timber Frame, Wall Junction

vapour permeable membrane (with a vapour resistance of no more than 0.6 MN.s/g)vapour control layer

flexible cavity barrier


continuous bead of sealant applied to floor deck prior to

positioning of upper wall panel

Revision E

Timber Frame6.18 Timber Intermediate Floor

20mm strip of insulation with thermal conductivity ( value) not exceeding 0.025W/mK installed around floor perimeter

vapour control layervapour permeable membrane (with a vapour resistance of no more

than 0.6 MN.s/g)

cavity barriers giving 30 minute fire resistance


perpend vent

sealant between skirting and floor


plan view

alternative detail where required for structural reasons - insulation placed in void before wall panels are erected

standard corner detail - insulation

tucked into corner

Revision C

Timber Frame6.19 Wall Junction

vapour permeable membrane(with a vapour resistance of no more than 0.6 MN.s/g)


cavity barriers with 30 minute fire resistance are not shown, ensure that those provided are not breeched by inappropriate insulation in the timber frame


plasterboard

rigid insulated sheathing board



7.00 Steel Frame


structural light gauge steel frame

compressible mineral wool insulation

cavity

stainless steel wall tie in channelsfixed to stud structure through insulation



cavity barrier giving 30 minute fire resistance - ensure cavity barrier is not breeched by inappropriate rigid sheathing insulation material

Steel Frame7.01 Pitched Roof, Ventilated Roofspace, Eaves






roofing membrane





roof pitch is below 15°

insect mesh should be installedRead in conjunction withWarm Steel FramePitched Roof, Ventilated Roofspace, Gable


sarking board



mineral wool insulation between the studs in addition to the rigid board over. This insulation must be tightly packed and be in direct contact with the rigid board



Steel Frame7.02 Pitched Roof. Ventilated Roof Space. Gable

loft insulation continued up to inner face of the rigid

sheathing insulant

Read in conjunction withSteel FramePitched Roof, Ventilated Roofspace, Eaves


mineral wool insulation between the studs in addition to the rigid board over.This insulation must be tightly packed and be in direct contact with the rigid board

vapour control layer stainless steel wall tie in channelsfixed to stud structure through insulation





inhabited space


Steel Frame7.03 Pitched Roof, Ventilated Rafter Void, Eaves

Read in conjunction withSteel FramePitched Roof, Ventilated Rafter Void, Gable

sarking board


50mm air gap






opening



between rafters







50mm ventilation path over insulationlap roof and wall insulation, roof

insulation to be compressed between sarking and timber frame

Steel Frame7.04 Pitched Roof, Ventilated Rafter Void, Gable

Read in conjunction withSteel FramePitched Roof, Ventilated Rafter Void, Eaves








Steel Frame7.05 Pitched Roof, Ventilated Batten Void (warm roof), Eaves.







0.6 MN.s/g)

support insulation between rafters on netting, battens

or clips

inhabited space

Read in conjunction withSteel FramePitched Roof, Ventilated Batten Void (warm roof), Gable


ventilation gap equivalent to 5mm minimum continuous opening is required at ridge to batten space




between rafters

cavity barrier giving 30 minute fire resistance - ensure cavity barrier is not breeched by inappropriate rigid sheathing insulation materialmineral wool insulation between the studs in addition to the rigid board over.This insulation must be tightly packed and be in direct contact with the rigid board




stainless steel wall tie in channels

fixed to stud structure through insulation




lap roof and wall insulation, roof insulation to be compressed between

sarking and frame

insulation between rafters supported on battens, clips or netting

Steel Frame7.06 Pitched Roof, Ventilated Batten Void (warm roof), Gable

Read in conjunction withSteel FramePitched Roof, Ventilated Batten Void (warm roof), Eaves






mineral wool insulation between the studs in addition to the rigid board over. This insulation must be tightly packed and be in direct contact with the rigid board





and sealed

eaves - fix full height blocking piece and tightly pack mineral wool into void and under deck

verge - tightly pack mineral wool into void over wall and under

deck (not shown)

roofing membrane


Steel Frame7.07 Timber Flat Roof

declevity piece


guidance







Steel Frame7.08 Timber Flat Roof with Parapet


vapour control layer turned up edge of roof insulation, lapped with roof waterproofing layer, and sealed

roofing membrane to be taken minimum 150mm above finished roof level

declevity piececavity barrier giving 30 minute fire resistance - ensure cavity barrier is not breeched by inappropriate rigid sheathing insulation material



insulated upstand having a minimum R value of 0.75 m2K/W supported on a sheathing board around the parapet

tightly packed compressible insulant between the wall studs above the level of the roof deck



proprietary cavity barriergiving 30 minute fireresistance


Steel Frame7.09 Lintel at Window Head

sealant to frontof frame

sealant to front and backof frame

The same thermal principles apply at the head of doors.

steel lintel


sealant to back of frameN.B. in certaincircumstances the lintel willrequire fire resistance -check with lintelmanufacturer

N.B. in areas of extremeexposure, a cavity traytype DPC will be applied ontop of the lintel - checkwith lintel manufacturer alternative for heavy duty lintel

weep hole takenthrough render

weep hole takenthrough render

This detail is a constituent component of the SBSA, Technical Guide : Accredited Construction Details (Scotland) and should be used only after reference to theintroduction and the supplementary guidance where the relevance and any limitations on the use of this detail are set out.

proprietary cavity barriergiving 30 minute fire

resistance

sealant to front and back offrame/sill

Plan View

section view

Steel Frame7.10 Windows and doors, Jambs and sills


sealant to back offrame

proprietary cavity barriergiving 30 minute fire

resistance

damp proof course

damp proof course vapour control layer


stainless steel wall tiein channels

fixed to stud structurethrough insulation

This detail is a constituent component of the SBSA, Technical Guide : Accredited Construction Details (Scotland) and should be used only after reference to theintroduction and the supplementary guidance where the relevance and any limitations on the use of this detail are set out.



damp proof course


Steel Frame7.11 Ground Bearing Floor, Insulation Above Slab


perpend vent

seal between the wall and floor membrane with a flexible sealant or seal the gap between the skirting board and floor using a flexible sealant

the wall insulation installed below the wall DPC must be

fit for purpose with regards to water absorption

stainless steel wall tie in channelsfixed to stud structure through

insulation


Steel Frame7.12 Ground Bearing Floor, Insulation Below Slab

damp proof course


perpend vent




damp proof membrane







damp proof course

damp proof membrane

Steel Frame7.13 Raft Foundation



perpend vent

the wall insulation installed below the wall DPC must be fit for

purpose with regards to water absorption




Steel Frame7.14 In-situ Suspended Ground Floor Slab. Insulation Above Slab



damp proof membrane

damp proof course



perpend vent

Seal between the wall and floor membrane with a flexible sealant or seal the gap between the skirting board and floor using a flexible sealant

the wall insulation installed below the wall DPC must be fit

for purpose with regards to water absorption


insulation




damp proof course


damp proof membrane

solum

Steel Frame7.15 Concrete Beam and Block Ground Floor



perpend vent






insulation


Steel Frame7.16 Steel Suspended Ground Floor



insulating block

external ground level solum


perpend vent


seal the gap between the skirting board and floor using a flexible sealantthe wall insulation installed

below the wall DPC must be fit for purpose with regards

to water absorptionoptional mineral wool insulation directly under flooring

damp proof membrane

damp proof course

rigid insulation fixed to the underside of the joists

light steel joist with bitumen coated ends built onto masonry wall


insulation


Plan View

Steel frame7.17 Separating Wall

acoustic insulation not shown

cavity barriers giving 30 minute fire resistance, ensure cavity barriers are not breeched by inappropriate

insulation material in the steel frame




continue the wall insulation across the floor abutment

zone

Steel Frame7.18 Steel Intermediate Floor


cavity barriers giving 30 minute fire resistance


perpend vent

sealant between skirting and floor



plan view

Steel Frame7.19 Wall Junction


cavity barriers with 30 minute fire resistance are not shown, ensure that those provided are not breached by inappropriate rigid sheathing insulation material

corner detail using standard sized studs - insulation placed in void before second stud is erected

alternative detail using increased stud size - insulation fitted within the stud



ventilation to rafter voidconsideration to be given

to maintenance of circulation

roofing membrane

sarking board



window frame to be level or lower than top of

counterbatten to minimise thermal bridging

push flexible insulation into gap between frame and tile

batten

10mm strip of insulation with thermal conductivity ( value) not exceeding 0.025W/mK to be installed around reveals

General Arrangements8.02 Roof Window, Ventilated Rafter Void

pack with insulation

proprietary flashing

proprietary drainage gutter

side gutter of proprietary flashing


Revision B

For proprietary details consult roof window manufacturer


General Arrangements8.03 Roof Window. Ventilated batten Void (Warm Roof)



0.25MN.s/g)rigid insulation as sarking



push flexible insulation into gap between frame and tile

batten

10mm strip of insulation with thermal conductivity ( value) not exceeding 0.025W/mK to be installed around reveals


proprietary drainage gutter


pack with insulation

Revision A

window frame to be level or lower than top of

counterbatten to minimise thermal bridging

side gutter of proprietary flashing

For proprietary details consult roof window manufacturer


General Arrangements8.04 Loft Hatch

ensure loft hatch / proprietary hatch is fully draught sealed

counterbearers and boarding should be provided if access to loft is required

U-value through loft hatch should not exceed 0.35W/m ² K

revision B


vapour control layer under timber floor finishdamp proof membrane above or below slab

damp proof course stepped down locally at entrance

continue floor insulation up to back of sill

General Arrangements8.05 Level Threshold, Insulation above Slab, Ramped Access

proprietary weather bar seal for air leakage / rain penetration

revision D

ramped access

surrounding ground level


damp proof membrane

damp proof course stepped down locally at entrance

continue floor insulation up to back of sill

proprietary weather bar seal for air leakage / rain penetrationfor sill types other than timber / plastic / composite also include a perimeter of insulation to the rear of sill, minimum 20mm thick, with thermal conductivity (value) not exceeding 0.025W/mK

General Arrangements8.06 Level Threshold, Insulation below Slab, Ramped Access

revision C

ramped access



General Arrangements8.07 Level Threshold, Timber Floor, Ramped Access

insert 20mm insulation with thermal conductivity ( value) not

exceeding 0.025W/mK against inner leaf and back of sill


solum


proprietary weather bar seal for air leakage and rain penetration

revision C

ramped access

damp proof course


General Arrangements8.08 Ceilings, Service Penetrations

seal all service penetrations with expanding foam or other suitable sealant

for large voids mineral wool or other material may be used to provide a backing for the sealant

similar arrangements should be adopted for service penetrations through ground floors

N.B. insulation material has been omitted for clarity

revision B


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Roof Details

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