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Timspec CERTCLAD Weatherboards

Bevel Back Cavity System

Installation Manual

Timspec CERTCLAD Weatherboards Bevel Back Cavity System Installation Manual

Version 1-3

© Timber Specialists Limited 2011 Page 1 of 72 Updated: 2nd Nov 2012

TIMSPEC

The Timber Specialists

Email: [email protected]

Website: www.timspec.co.nz

AUCKLAND

64 Stoddard Road, Mt Roskill

Ph: (09) 620-0260

Fax: (09) 620-0261

CARTERTON

30 Kent Street

Ph: (06) 379-9381

Fax: (06) 379-9382

CHRISTCHURCH

69 Hayton Road, Sockburn

Ph: (03) 341-0242

Fax: (03) 341-0243

TABLE OF CONTENTS

Scope ...................................................................... 2

Health and Safety .................................................... 6

Site Preparation ....................................................... 7

Pre-Installation ....................................................... 9

Materials ............................................................... 10

Installing Cavity Battens ........................................ 25

Fixing Details for Weatherboard ............................ 28

Inter-Storey Cavity Junctions ................................. 33

Within-Board Joins ................................................ 34

External 90° Corner Details ................................... 35

External 135° Corner Details ................................. 39

Internal 90° Corner Details .................................... 40

Internal 135° Corner Details .................................. 44

Bottom Plate (Base of Wall) Details ........................ 46

Enclosed Deck Details ........................................... 50

Top Plate (Top of Wall) Details ............................... 53

Parapet/Enclosed Balustrade Details ...................... 58

Pipe Penetration Details ........................................ 64

Meter Box ............................................................. 66

Site Clean-up ........................................................ 70

On-going Maintenance ......................................... 71


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SCOPE

INTENDED USE

This Bevel Back Weatherboard Cavity System has been designed for use as cladding for

residential and small commercial buildings. It is only suitable for buildings with a „Risk Score‟

of 20 or below as per the „Risk Matrix‟ outlined in E2/AS1. Refer to the Department of Building

and Housing‟s booklet titled „External moisture - a guide to using the risk matrix‟ for more

information.

This is an Alternative Solution in terms of NZBC compliance.

VALIDITY

CodeMark certification is only valid when all products in the weatherboard system are

CERTCLAD branded or Timspec approved and all methods and procedures outlines in this

manual are followed. This is to ensure that all products are up to the standards required by

CodeMark and are installed in the correct manner.


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SCOPE (CONTINUED)

PERFORMANCE

When installed and maintained as specified in this manual and the work is done by a qualified

tradesman using accepted trade practices, it will meet the applicable sections of the following

requirements of the NZBC (New Zealand Building Code as contained in the Building Regulations

Act 1992):

B1 Structure

B2 Durability

E2 External Moisture

F2 Hazardous Building Materials

This is evidenced by conformance with the objectives of the following Department of Building

and Housing Compliance documents:

B1/AS1 (amendment 10, effective from 19 May 2011)

B2/AS1 (amendment 7, effective from 4 April 2011)

E2/AS1 (third edition, amendment 5, effective from 1 August 2011)

F2/AS1 (amendment 2, effective from 1 December 2000)


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SCOPE (CONTINUED)

WIND ZONES

This solution is only acceptable for wind zones up to and including „Very High‟ as defined in

NZS 3604 (New Zealand Standard 3604:2011 Timber Framed Buildings).

Note: Extra High wind zones are outside the scope of this document. Please refer to E2/AS1

for construction details as rigid underlays and larger flashings will be required.

MASS

The mass of Timspec Bevel Back Weatherboard is approximately 12 kg/m2 and therefore is

considered a lightweight cladding by NZS 3604.

Weatherboard

Material

Timber Density

(Air Dried)

Approx Mass

Accoya® wood 512 kg/m3 10.5 - 14.9 kg/m²

Radiata Pine 500 kg/m3 10.3 - 14.6 kg/m²

Western Red Cedar 385 kg/m3 7.7 - 11.4 kg/m²

LIFESPAN

MINIMUM LIFE

This Bevel Back Weatherboard Cavity System has 15-year durability as required by NZS 3602

(New Zealand Standard 3602:2003 Timber and wood-based products for use in building).


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SCOPE (CONTINUED)

LIFESPAN (CONTINUED)

SERVICEABLE LIFE

In addition to the above minimum life, this Bevel Back Weatherboard Cavity System is expected

to have a serviceable life of at least:

50 years for Accoya® wood; or

15 years for H3.1 treated Radiata Pine when painted; or

40 years for H3.2 treated Radiata Pine when painted; or

40 years for Western Red Cedar when coated.

This serviceable life is subject to the paint, coating and maintenance requirements below.

More importantly some Cedar and Radiata Pine boards may require replacement over the

lifetime of the cladding.

COATING REQUIREMENTS

To achieve the above serviceable life all hidden faces of Western Red Cedar must be coated

with a minimum of one coat of penetrating oil and all exposed faces must be coated with a

further two coats, refer to page 17 for more information. For Radiata Pine all hidden face must

be coated with one coat of primer and all exposed faces coated with a further two coats of a

suitable topcoat, refer to page 15 for more detail.

MAINTENANCE REQUIREMENTS

The above serviceable life spans assume regular maintenance. Appearance will degrade over

time unless timber is coated and both the coatings and all aspects of the cladding system are

maintained.

Please refer to the On-Going Maintenance section on page 71 for more information about the

required maintenance.


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HEALTH AND SAFETY

CUTTING OF TIMBER

Cutting of timber is to be done in a well ventilated area and a suitable dust mask, eye

protection, and ear protection must be worn.

COATING AND PRIMING

Coating and priming is to be done in a well ventilated area, refer to the coating/primer

supplier for all matters relating to health and safety. All relevant sections of standard AS/NZS

2311:2009 (Guide to the painting of buildings) should be adhered to.


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SITE PREPARATION

STRUCTURE AND FRAMING

NEW ZEALAND STANDARD 3604

Generally, the timber framing must comply with NZS 3604 (Timber-framed buildings), however

where specific engineering design is required the framing shall be at least of equivalent

stiffness as the framing provisions of NZS 3604.

LAYOUT

Studs must be at a spaced at a maximum of 600mm between centres. Dwangs (noggins) must

be spaced at a maximum of 800mm between centres. Studs and dwangs must form a flush

plane for cavity battens and weatherboards to be fixed to.

Additional framing may be required at soffits, corners, window and door openings.

MOISTURE CONTENT

The moisture content of the framing must not exceed 20% at the time of fixing the

weatherboard as problems may occur later due to excessive timber movement if framing is too

wet.


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SITE PREPARATION (CONTINUED)

BUILDING WRAP

MATERIAL

Building wrap must comply with properties stipulated in Table 23 (Properties of roof underlays

and building wraps) of E2/AS1.

INSTALLATION

Install the building wrap (also called wall underlay) directly over the framing i.e. under the

cavity battens. No additional building wrap is required over the cavity battens.

INTERMEDIATE SUPPORT

If studs are greater than 450mm between centres a polypropylene strap or galvanised wire

must be run vertically between studs to provide intermediate support to prevent the building

wrap from bulging into the cavity as referred to in paragraph 9.1.8.5 of E2/AS1.

HORIZONTAL JOINS

At horizontal joins (e.g. between stories) ensure that the upper layer overlaps the lower layer

by minimum 75mm.

VERTICAL JOINS

Ensure that at vertical joins, the lap is minimum 150mm and situated over a stud.

TRIMMED OPENINGS

Trimmed openings are to be prepared in accordance with E2/AS1 paragraph 9.1.5 or an

approved alternative solution.

We recommend that building wrap be turned into the opening and secured over the framing.

Flexible flashing tape should be applied to the full width of the sill, and at the corners of the

jamb and head, have minimum 100mm turn-up along jambs and heads have minimum 50mm

lap over the exterior wall.


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PRE-INSTALLATION

ON-SITE STORAGE AND HANDLING

Care must be taken to ensure that timber and accessories are kept clean and dry, and are not

damaged whilst in storage awaiting application.

Extra care is to be taken while handling timber to ensure that they are not damaged.

Timber is to be stacked on flat level bearers/dunage that are a maximum of 900mm apart and

at least 100mm off the ground. Timber should either be stored inside an enclosed building or

covered and protected from the elements when stored outside.

Important: Timber weatherboards should not be installed if their moisture content is

outside the range of 14 - 18%.

DOCKING OUT DEFECTS

Before coating or installing boards, check for any defects that may require docking out.

Important: All docked ends of stained or painted weatherboards will require priming

with a minimum of one coat of primer or stain.

PRIMING AND SEALING (APPLIES TO STAINED OR PAINTED WEATHERBOARDS ONLY)

Apply the first coat of stain or primer to all sides and edges of the weatherboard prior to

installation. Remember that all docked ends will require priming as noted above. Follow the

coating manufacturer‟s directions and ensure further coats are applied as required. All

relevant sections of standard AS/NZS 2311:2009 (Guide to the painting of buildings) should be

adhered to.

Note: It is usually easier to order your weatherboards to arrive on-site

preprimed/precoated.


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MATERIALS

SUPPLY AND ALTERNATIVE ITEMS

WEATHERBOARDS

All Weatherboards must be CERTCLAD brand weatherboard supplied by Timspec either directly

or through an agent/merchant. This is to ensure that the weatherboard is up to standard

(profile, grade, treatment, moisture content, etc). Any alternative or competitor supplied

weatherboard will invalidate the CodeMark certification.

ANCILLARY ITEMS

All Ancillary Items (Cavity Battens, Soakers, Flashings, Profiles, and Nails) must be supplied or

approved by Timspec. This is to ensure that the compatibility and suitability of the ancillary

items.

ITEMS PRECEDING OR SUCCESSIVE TO THE WEATHERBOARD SYSTEM

All items that precede the installation of the weatherboard system (building wrap, roofing

underlay, flashing tape, etc) and all consumables and items successive to the weatherboard

system (PEF backing rods, flexible sealants, etc) will not be supplied by Timspec as these are

outside their role.


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MATERIALS (CONTINUED)

ACCOYA® WOOD BEVEL BACK WEATHERBOARD

MATERIAL

New Zealand grown Radiata Pine modified to the core by a non-toxic, proprietary acetylation

process.

DURABILITY

Accoya is class one durable, furthermore it is guaranteed not to rot for 50 years in above-

ground applications.

For the purpose of this guarantee, rot is defined as fungal decay that materially damages the timber caused by the soft-rot fungal

species: Poria placenta, Coniophora puteana, Gloeophyllum trabeum, Corriolus versicolor or Serpula lacrymans but does not

include common surface mould, mildew or any other organism either bacteria or fungi.

Scion (New Zealand Forest Research Institute) compared Accoya to commonly used hardwoods,

H3.2 and H4 CCA treated Radiata Pine as both ground contact stakes and fungus cellar

stakelets (an accelerated decay environment). In both tests Accoya dramatically outperformed

the durability of all the other timbers (including H4 treated Pine). The report “The Durability of

Accoya Radiata Pine Sapwood Results from Ground Contact Tests after Five Years Exposure” is

available from www.accoya-timspec.co.nz.

ABOUT ACETYLATION

Accoya woods exceptional durability is a result of the acetylation process. Acetylation is a

chemical process which effectively changes the free hydroxyls (chemical groups that readily

absorb and release water, causing shrinkage and swelling) within the wood into acetyl groups.

This is done by reacting the wood with acetic anhydride, which comes from acetic acid (known

as vinegar when in its dilute form). When the free hydroxyl group is transformed to an acetyl

group, the ability of the wood to absorb water is greatly reduced, rendering the wood more

dimensionally stable and extremely durable.


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ACCOYA® WOOD BEVEL BACK WEATHERBOARDS (CONTINUED)

MATERIAL RESOURCE

FSC Certified - All Accoya® wood supplied from Timspec is from New Zealand grown FSC

Certified resources and is sold under the Mixed Credit classification.

ABOUT FSC

The Forest Stewardship Council (FSC) is an independent, non-governmental, not-for-profit

organisation established to promote the responsible management of the world‟s forests. FSC

has 10 principles and 56 associated criteria which describe how forests have to be managed in

order to meet the social, economic, ecological, cultural and spiritual needs of present and

future generations.

They include managerial aspects, chain-of-custody requirements, as well as environmental

and social requirements. FSC rules are the strictest and FSC‟s social and environmental

requirements are the highest of any certification scheme. This is probably why FSC is the only

forest certification system that is supported by all major environmental groups.

COATING

We recommend a fungicidal coating be applied to prevent unsightly (but non-detrimental)

surface mould.

IMPORTANT NOTES

Accoya wood has higher acidity levels than most timber and will cause oxidization or corrosion

when in direct contact with certain metals and moisture. Do not use Accoya in direct contact

with copper, galvanized steel, powder-coated aluminium, zinc-alum, or zinc plated steel.

Stainless Steel (304 or 316) or brass fastenings and fixings must be used as these will not

degrade like other metals.


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ACCOYA® WOOD BEVEL BACK WEATHERBOARDS (CONTINUED)

PROFILES DRAWINGS


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RADIATA PINE BEVEL BACK WEATHERBOARD

MATERIAL

New Zealand grown Radiata Pine preservative treated to an H3.1 or H3.2 level.

DURABILITY

H3.1 treated Radiata Pine has an above-ground durability of 15 years when adequately

painted.

H3.2 treated Radiata Pine has above-ground durability of 40 years when adequately stained or

painted.

MATERIAL RESOURCE

FSC Certified where available - Radiata Pine supplied from Timspec is New Zealand grown and

from a mixture of FSC Certified resources and non-contentious resources, please refer to

invoice for details.

IMPORTANT NOTES

Timber treated with a copper-based treatment (ACQ, CCA, etc) should not be in contact with

metal wall claddings as this may lead to corrosion.


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RADIATA PINE BEVEL BACK WEATHERBOARD (CONTINUED)

COATING H3.1 TREATED WEATHERBOARD

H3.1 treated Radiata Pine must be coated with a minimum one coat of primer and two further

coats of alkyd or 100 percent acrylic. All relevant sections of standard AS/NZS 2311:2009

(Guide to the painting of buildings) should be adhered to.

Weatherboards will arrive onsite with one coat of Dulux Ultraprime already applied.

All cut ends must be coated with a minimum of one coat of primer before installation.

Immediately after fixing the weatherboards, all nail holes should be filled and spot-primed.

As soon as possible after fixing the weatherboards they should be over-coated with a

minimum of two coats of a suitable premium paint. Follow the paint manufactures directions.

If the weatherboard has been exposed to the elements for an extended period of time

(generally 4 weeks) or if there is evidence of the primer chalking, then repriming will be

necessary. This involves sanding the primer back to a sound surface and re-priming using a

premium oil based primer.

COATING H3.2 TREATED WEATHERBOARD

For painting, please refer to the information above for H3.1 treated weatherboard.

Upon request we can supply H3.2 treated weatherboard uncoated for you to coat as you wish.

Please be aware that a stain or penetrating oil will not last as long as a painted product.

A suitable coating must be used to achieve the 15 year lifespan.

COLOURS

Dark colours attract more heat which will exacerbate any timber movement and/or resin bleed.

For this reason we recommend the use of colours with a LRV (light reflective value) of 45% or

more.


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RADIATA PINE BEVEL BACK WEATHERBOARD (CONTINUED)

PROFILES DRAWINGS


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WESTERN RED CEDAR BEVEL BACK WEATHERBOARD

MATERIAL

North American grown Western Red Cedar (Thuja plicata).

DURABILITY

Western Red Cedar is naturally durable for 25 years; however some boards will require

replacement during this time.

MATERIAL RESOURCE

FSC or PEFC Certified where available - Western Red Cedar supplied from Timspec is North

American grown and from a mixture of FSC Certified, PEFC Certified resources and non-

contentious resources, please refer to invoice for details.

COATING

No coating is required, however a coating and will dramatically improve the appearance,

performance and durability of the cladding. Timspec recommend a coating system comprising

a base coat of a penetrating oil to all sides of the weatherboard followed by two top coats to all

exposed faces.

Dark colours attract more heat which will exacerbate any timber movement, for this reason we

only recommend light colours.

IMPORTANT NOTES

Careful board selection will help improve the lifespan of your cladding. Quarter sawn boards

should be selected for use in higher exposure areas, such as north facing walls and lower parts

of the wall (where boards are less protected by eaves).


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WESTERN RED CEDAR BEVEL BACK WEATHERBOARD (CONTINUED)

PROFILES DRAWINGS


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CAVITY BATTENS

MATERIAL

H3.1 treated Radiata Pine

DIMENSIONS

Machined to a finished size of 45mm wide (to match framing width) and 18-25mm thick for

packer (non-structural) battens or 20mm thick for structural battens.

DIAGRAM


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NAILS

MATERIAL

Nails can be either: Galvanised Steel, Silicone Bronze or Stainless Steel (316).

COMPATIBILITY

Refer to the table below to check the compatibility of Nails and Weatherboard materials:

Weatherboard Material

Accoya

wood

H3.1 treated

Radiata Pine

H3.2 treated

Radiata Pine

Western Red

Cedar

Nail M

ate

rial

Silicone Bronze No Yes Yes Yes

Galvanised Steel No Yes Conditional See Note Below

No

Stainless Steel (316) Yes Yes Yes Yes

Note: In Sea-spray zones, all nails are to be Stainless Steel as per NZS 3604 paragraph 4.2.3.

Note: All of the following conditions must be met in order to use Galvanised Steel nails in H3.2

treated Radiata Pine weatherboards:

1. Timber treatment must be CCA; and

2. Nails must be punched below timber surface and filled with a suitable filler to prevent

water from accessing the nail; and

3. Weatherboards must be painted as detailed in Coating H3.1 Treated Weatherboards on

page 15.

Important:

If the timber treatment is ACQ or CuAz then you must use stainless steel nails as these treatments are more corrosive.

If the nails are rosehead or pentagon-head then you must use stainless steel nails as the nail will sit above the timber surface and

be exposed to water.

If the weatherboard is not painted you must use stainless steel nails.


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SOAKERS

MATERIAL

Soakers can be either: Galvanised Steel, Aluminium, Stainless Steel (304) or Copper.

COMPATIBILITY

Refer to the table below to check the compatibility of Soakers and Weatherboard materials:


Accoya

wood

H3.1 treated

Radiata Pine

H3.2 treated

Radiata Pine

Western Red

Cedar

Soaker

Mate

rial Aluminium No Yes No Yes

Copper No Yes Yes Yes

Galvanised Steel No Yes No No


PRODUCT CODES

Refer to the table below for the appropriate product code:

Soaker

Product Code

Galvanised

Steel Aluminium

Stainless

Steel (304) Copper

150mm Flat Soaker 42060 42700 42632 42170

150mm 90° Corner Soaker 42000 42690 42620 42110

150mm 135° Corner Soaker 42005 42696 42626 42115

200mm Flat Soaker 42070 42702 42634 42180

200mm 90° Corner Soaker 42010 42692 42622 42120

200mm 135° Corner Soaker 42015 42698 42628 42125


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FLASHINGS

MATERIAL

Flashings can be either: Galvanised Steel, Aluminium or Stainless Steel (304).

COMPATIBILITY

Refer to the table below to check the compatibility of Flashings and Weatherboard materials:


Accoya

wood

H3.1 treated

Radiata Pine

H3.2 treated

Radiata Pine

Western Red

Cedar

Fla

shin

g

Mate

rial

Aluminium No Yes No Yes

Galvanised Steel No Yes Yes No



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FLASHINGS (CONTINUED)

PRODUCT CODES

Refer to the table below for the appropriate product code:

Flashing

Product Code

Galvanised

Steel Aluminium

Stainless

Steel (304)

Flashings for closing the bottom of cavities:

20mm Cavity Base Closure Flashing 40218 40220 40222

Flashings for inter-storey cavity junctions:

35mm „Z‟ Flashing 40168 40930 40932

Flashings for corners:

50 x 50mm External Corner (hemmed) Flashing 40105 40936 40940

90 x 90mm Internal Corner (hemmed) Flashing 40118 40937 40941

90 x 90mm 135° Internal Corner (hemmed) Flashing 40119 40938 40942

Flashings for enclosed balustrades and parapets:

Capping 40205 40946 40949

Capping for Very High Windzones 40206 40947 40950

Saddle Flashing 40212 40213 40214

Flashings for meterboxes:

Meterbox „Z‟ Flashing 40214 40960 40966

Meterbox Head Flashing 40215 40961 40967

Meterbox Sill Flashing 40217 40963 40969

Meterbox Jamb Flashing 40216 40962 40968


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FLASHINGS (CONTINUED)

DIAGRAMS


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INSTALLING CAVITY BATTENS

Cavities must comply with E2/AS1 paragraphs 9.1.8 to 9.1.9.4

Refer to Department of Building and Housing‟s booklet titled „Constructing Cavities for Wall

Claddings‟ for further information about installing cavity battens.

PACKER VS STRUCTURAL CAVITY BATTENS

There are two methods available for installing Cavity Battens:

Packer Cavity Battens: which are only temporarily fixed to the framing until the

weatherboard is installed at which point the weatherboard fixing permanently fixes the

cavity batten to the framing. The main disadvantage of this method is it requires a

larger nail to penetrate the weatherboard and cavity batten to attain the required

framing penetration.

Structural Cavity Battens: which are permanently fixed to the framing by larger and

more frequent nails. This results in the batten being considered part of the framing in

respect to the fixing of Weatherboard, which means that a 35mm fixing penetration can

be achieved with 20mm in the batten and 15mm in the framing so that a smaller nail

can be used for fixing the weatherboard. The disadvantage of this method is that it

requires a more rigorous fixing of the cavity batten to the framing.

Refer to BRANZ bulletin 475 (August 2006) for more details on Structural Cavity Battens.

MATERIAL

As per the requirements on the materials page 19: Cavity battens are to be H3.1 treated

Radiata Pine machined to a finished size of 45mm wide (to match framing width) and 18-

25mm thick for packer (non-structural) battens or 20mm thick for structural battens.

PRECAUTIONS

As solvents in LOSP treatments can affect bitumen used in some building papers, it is

necessary to fillet stack timber for 7 days after treatment to ensure that solvent has evaporated

before contact with any bitumen-based building paper.


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INSTALLING CAVITY BATTENS (CONTINUED)

LOCATION

The cavity battens must be fixed over the building wrap.

FIXING STRUCTURAL CAVITY BATTENS

Structural cavity battens are to be fixed to the framing with either:

60 x 2.8mm jolt or flat head, hot dipped galvanised nails; or

75 x 3.15mm jolt or flat head, hot dipped galvanised nails; or

Paslode Impulse 65 x 2.87mm „D‟ flat head, power-driven, galvanised nails.

Structural cavity battens are to be fixed to the framing at 300mm centres with fixings

staggered 12mm either side of the batten centreline.

Note: Cavity Structural Battens must be 20mm thick as stipulated in the Materials section on page 19.

FIXING PACKER (NON-STRUCTURAL) CAVITY BATTENS

Packer cavity battens are to be fixed to the framing with either:

40 x 2.5mm flat head, hot dipped galvanised nails; or

Paslode Impulse 50 x 2.8mm „D‟ flat head, power-driven, galvanised nails.

Packer cavity battens are to be fixed to the framing at 800mm centres.

Note: Fixing is only temporary for packer cavity battens as the weatherboard fasteners are used to permanently fix the batten.


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INSTALLING CAVITY BATTENS (CONTINUED)

TOP OF WALL DETAIL

No ventilation is required at the top of the cavity. Use a horizontal batten at the top of the wall

to close off the top of the cavity. This prevents damp air circulating from the cavity space into

interior spaces such as roof framing or eaves and is extremely important where the cavity

finishes beneath an area that is open to a roof space (such as a wall finishing under a soffit).

BOTTOM OF WALL DETAIL

Use a „Cavity Base Closure Flashing‟ at the bottom of the wall to allow drainage and ventilation

but prevent the entry of vermin. This also applies where cavities end over a window, door or

other opening. Ensure building wrap laps over the cavity base closure or use flashing tape to

seal the top of the cavity base closure to the building wrap.

HORIZONTAL BATTENS OR SPACERS

If you use a horizontal batten (apart from at the top of a wall), for example to provide

intermediate support, then make sure there is minimum 50mm clearance on each side to the

vertical batten and the horizontal batten must have a minimum 5° slope to allow water to run

off.


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FIXING DETAILS FOR WEATHERBOARD

FIXING METHOD

Nail placement is to be maximum 42mm above bottom edge of weatherboard to ensure that it

is maximum 10mm above the top of lower board. The nail must not penetrate the

underlapping (lower) board.

Pre-drill all nail holes using a bit that is slightly smaller than the nail to prevent splitting.

Nail on an upward angle to prevent water running down the nail through the cavity.

Hand-drive all nails, gun-driven nails are not recommended as they may damage the surface

of the timber.

NAIL SELECTION CHART

Painted Weatherboard Stained/bare Weatherboard

Structural Cavity Battens

75 x 3.15mm jolt head nail

65 x 3.2mm rose head

or pentagon head

annular grooved nail

Packer Cavity Battens

90 x 4.0mm jolt head nail

Or

75 x 3.15mm annular

grooved nail

85 x 3.2mm rose head

or pentagon head

annular grooved nail


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FIXING DETAILS FOR WEATHERBOARD (CONTINUED)

DIAGRAM FOR PAINTED WEATHERBOARDS WITH STRUCTURAL CAVITY BATTENS


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DIAGRAM FOR PAINTED WEATHERBOARDS WITH PACKER CAVITY BATTENS

Note: Although a 90 x 4.0mm jolt head nail is shown (achieving 35mm framing penetration), a

smaller 75 x 3.15mm nail may be used if it is annular grooved (which only needs to achieve a

25mm framing penetration).


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TIMSPEC




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DIAGRAM FOR STAINED OR BARE WEATHERBOARDS WITH STRUCTURAL CAVITY BATTENS

Care must be taken when nailing rose head or pentagon head nails, they must be hand driven.

Too much force will damage the face of the timber.

When nailing rose head or pentagon head nails on an upward angle, care should be taken to

get the nails finishing on the face of the weatherboard.


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TIMSPEC




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DIAGRAM FOR STAINED OR BARE WEATHERBOARDS WITH PACKER CAVITY BATTENS

Care must be taken when nailing rose head or pentagon head nails, they must be hand driven.

Too much force will damage the face of the timber.

When nailing rose head or pentagon head nails on an upward angle, care should be taken to

get the nails finishing on the face of the weatherboard.


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TIMSPEC




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INTER-STOREY CAVITY JUNCTIONS

USE

Cavities may be continuous up to two storeys but, due to limitations on drainage and drying,

walls over two storeys in height require a horizontal divider.

DIAGRAM


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WITHIN-BOARD JOINS

USE

Use a within-board join to join two weatherboards together for longer length walls.

METHOD

Weatherboards may be joined by scarfing two boards together over a stud. Use an appropriate

adhesive to bond the boards together and nail through the top board only. Space the nail

21mm from the edge of the join to avoid hitting the underlapping board. Care should be

taken to select and use two boards that have equal moisture contents; otherwise one board

may shrink or expand at a differing rate putting stress on the joint.

An optional flat soaker may be nailed in place over the join.

DIAGRAM


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TIMSPEC




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EXTERNAL 90° CORNER DETAILS

BOXED CORNER

METHOD

For Boxed corners use two cover boards and two lengths of scriber to box the corner.

The cover boards must cover a minimum of 50mm of the weatherboards.

Important: Building wrap must run continuously around the corner.

DIAGRAM


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TIMSPEC




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EXTERNAL 90° CORNER DETAILS (CONTINUED)

MITRED CORNER WITHOUT SOAKERS

USE

Mitred corners without soakers are only recommended for use with Accoya® wood, as Radiata

Pine and Western Red Cedar lack the stability and may open up.

METHOD

For Mitred corners use a 50 x 50mm External Corner (hemmed) Flashing behind the

weatherboards (over the cavity battens). Make sure the mitres are tight and sealed to try to

prevent the corner opening up. Avoid nailing too forcibly as undue stress on the mitred corner

could cause it to open up.



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MITRED CORNER WITHOUT SOAKERS (CONTINUED)

DIAGRAM


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SOAKERS CORNER

METHOD

For a soakers corner; the weatherboards can be roughly mitred and then covered with an

appropriate soaker.

The soaker must cover a minimum of 15mm over the weatherboards.

Use four 19 x 1.6mm annular grooved nails per soaker to fasten it to the weatherboards.


DIAGRAM


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EXTERNAL 135° CORNER DETAILS

SOAKERS CORNER

METHOD

For a soakers corner; the weatherboards can be roughly mitred and then covered with an

appropriate soaker.

The soaker must cover a minimum of 15mm over the weatherboards.

Use four 19 x 1.6mm annular grooved nails per soaker to fasten it to the weatherboards.


DIAGRAM


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TIMSPEC




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INTERNAL 90° CORNER DETAILS

SCRIBED AND NOTCHED CORNER

METHOD

For Scribed and Notched corners use a 90 x 90mm Internal Corner (hemmed) Flashing behind

the corner (over the cavity battens). Then cut a scribe out of one weatherboard and notch it so

that the other weatherboard fits into it.

IMAGE

Note: Top boards suppressed for clarity


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TIMSPEC




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INTERNAL 90° CORNER DETAILS (CONTINUED)

SCRIBED AND NOTCHED CORNER (CONTINUED)

DIAGRAM


Version 1-3


TIMSPEC




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INTERNAL MOULDING CORNER

METHOD

For an Internal Moulding corner use a 90 x 90mm Internal Corner (hemmed) Flashing behind

the corner (over the cavity battens). Then cut a 39 x 39mm Dressed Four Sides moulding to fit

the height of the corner and butt the weatherboards up to it.

IMAGE


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INTERNAL MOULDING CORNER (CONTINUED)

DIAGRAM


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TIMSPEC




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INTERNAL 135° CORNER DETAILS

SCRIBED AND NOTCHED CORNER

METHOD

For Scribed and Notched corners use a 90 x 90mm Flashing behind the corner (over the cavity

battens). Then cut a scribe out of one weatherboard and notch it so that the other

weatherboard fits into it.


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SCRIBED AND NOTCHED CORNER (CONTINUED)

DIAGRAM


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TIMSPEC




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BOTTOM PLATE (BASE OF WALL) DETAILS

CONCRETE SLAB-ON-GROUND

METHOD

Wall framing is to be separated from the concrete slab by a damp-proof-course (DPC).

Minimum 150mm from floor level to pavings (or 225mm to uncovered ground).

Ground to be sloped (minimum 1:30) to carry water away from building


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BOTTOM PLATE (BASE OF WALL) DETAILS (CONTINUED)

CONCRETE SLAB-ON-GROUND (CONTINUED)

DIAGRAM


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TIMSPEC




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TIMBER FLOOR

METHOD

Wall framing is to be separated from the foundation by a damp-proof-course (DPC).

Minimum 150mm from top of foundation wall to pavings (or 225mm to uncovered ground).

Ground to be sloped (minimum 1:30) to carry water away from building


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TIMBER FLOOR (CONTINUED)

DIAGRAM


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ENCLOSED DECK DETAILS

GENERAL DETAILS

Careful forward planning is required to ensure that an enclosed deck will meet all

requirements.

Enclosed decks may only be up to 40 m2 in area and there needs to be a minimum 100mm

from the finished deck surface height to the internal flooring height. Refer to E2/AS1 for other

requirements including drainage and surface fall.

Cladding must finish a minimum 35mm from the finished decking surface and have a 10mm

drip edge.

Butyl rubber or EPDM rubber is to be used as a deck membrane and it must have a fully

supported 150mm upstand. Refer to the deck membrane supplier as to whether timber or

tiles duck boards can be used on raised feet on the membrane. Note: If using duck boards

forward planning is required to ensure that cladding finishes a minimum 35mm above the

finished deck surface.

Refer to the following two diagrams for the base of wall details.


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ENCLOSED DECK DETAILS (CONTINUED)

CONCRETE SUBSTRATE

DIAGRAM


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TIMSPEC




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ENCLOSED DECK DETAILS (CONTINUED)

PLYWOOD SUBSTRATE

DIAGRAM


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TIMSPEC




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TOP PLATE (TOP OF WALL) DETAILS

FLAT SOFFIT

METHOD

Run a cavity batten horizontally along the top of the wall to seal the top of the cavity and to

prevent moisture/vapour transfer from the wall cavity into the roof cavity.

Fit a 42 x 19mm D4S Moulding tight up against the soffit lining.

DIAGRAM


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TIMSPEC




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TOP PLATE (TOP OF WALL) DETAILS (CONTINUED)

ANGLED SOFFIT

METHOD


prevent moisture/vapour transfer from the wall cavity into the roof cavity.

Fit a 42 x 19mm D4S Moulding tight up against the soffit lining.


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ANGLED SOFFIT (CONTINUED)

DIAGRAM


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TOP PLATE (TOP OF WALL) DETAILS

NO SOFFIT

METHOD


prevent moisture/vapour transfer from the wall cavity to the roof cavity.

When boxed corners are used: Use a packer to provide a flush surface to mount the fascia onto

so that fascia is flush with boxed corners.

When soakers or mitred corners are used: A fillet can be used to provide a flat surface flush

with the outside of the weatherboards to mount the spounting to.

Roofing must over hang the fascia by minimum of 50mm.

An eaves flashing may be required in certain situations (for example in high and very high wind

zones), the roofer is to determine if necessary and install.


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NO SOFFIT (CONTINUED)

DIAGRAM


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PARAPET/ENCLOSED BALUSTRADE DETAILS

CAPPING

METHOD

Wrap a continuous layer of building wrap over the framing (under the cavity battens).

Use a sloped packer continuously along the top of the parapet/enclosed balustrade to support

the capping flashing.

Parapets are to be capped with a metal flashing that meets all of the following criteria:

Capping is to have 50 year durability; and

No penetrations through the top of capping (fix through the side); and

Slope of top is to be minimum 5° (1:12); and

Capping is to be separated from timber by the use of roofing underlay or another

suitable material; and

Capping is to have minimum 50mm cover over weatherboards (70mm for very high

wind-zones); and

Capping is to have a „birds beak‟ style drip edge.

Enclosed balustrades must also comply with all the above criteria, except that cappings for

enclosed balustrades only require 15 year durability (this is because they are easier to inspect).

EXPANSION JOINTS

Metal cappings longer than 8 metres may require an expansion gap. Refer to E2/AS1 for

details.


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PARAPET/ENCLOSED BALUSTRADE DETAILS (CONTINUED)

CAPPING (CONTINUED)

DIAGRAM


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INTERSECTION WITH WALL

DIAGRAM


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INSTALLATION

STEP-BY-STEP

1: Cover the framed wall with building

wrap.

2: Frame the balustrade/parapet

3: Cover the balustrade/parapet with

building wrap ensuring that‟s its one

continuous piece over the top.

4: Apply battens to wall.

5: Apply cavity battens to

balustrade/parapet.

6: Fit a sloped packer to making sure it

extends all the way into the cavity of the

wall.


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INSTALLATION (CONTINUED)

STEP-BY-STEP

7: Fit corner flashings to corners.

8: Fix lower weatherboards to

balustrade/parapet.

9: Scribe and notch weatherboards on the

wall to the weatherboards on the

balustrade/parapet.

10: Fix weatherboards to

balustrade/parapet.

11: Continue to scribe and notch

weatherboards on the wall to the

balustrade/parapet.

12: Fit triangular packers to top of

balustrade/parapet to give a solid surface

for capping.


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30 Kent Street

Ph: (06) 379-9381

Fax: (06) 379-9382

CHRISTCHURCH


Ph: (03) 341-0242

Fax: (03) 341-0243


INSTALLATION (CONTINUED)

STEP-BY-STEP

13: Install an isolating layer of roofing

wrap between timber and metal capping.

14: Install saddle flashing.

15: Apply two lines of sealant to saddle

flashing in preparation for installing

capping flashing.

16: Install capping, and seal to saddle

flashing by riveting and using two lines

of sealant.

17: Scribe weatherboards to fit saddle

flashing.

18: Install rest of weatherboards, scribing

weatherboards to fit over saddle flashing.


Version 1-3


TIMSPEC




AUCKLAND


Ph: (09) 620-0260

Fax: (09) 620-0261

CARTERTON

30 Kent Street

Ph: (06) 379-9381

Fax: (06) 379-9382

CHRISTCHURCH


Ph: (03) 341-0242

Fax: (03) 341-0243

PIPE PENETRATION DETAILS

METHOD

Cut a hole in the building wrap just large enough for the pipe.

Pipe to be on 5° slope downward, so that any water in the cavity will run away from the

building wrap (towards the weatherboard).

Rest a bevelled packer on a noggin under the pipe to support it, and secure the pipe to the

packer with a strap/webbing fastened with screws.

Use flashing tape to create a flange that is adhered to both the building wrap and the pipe.

Lap along the building wrap for 100mm in all directions and 20mm along the pipe.

Cut a 6-10mm diameter hole through internal lining and weatherboard (so that there is 3-

5mm between pipe and internal lining/weatherboard) and apply a suitable sealant over PEF rod

to make weathertight.

IMAGE


Version 1-3


TIMSPEC




AUCKLAND


Ph: (09) 620-0260

Fax: (09) 620-0261

CARTERTON

30 Kent Street

Ph: (06) 379-9381

Fax: (06) 379-9382

CHRISTCHURCH


Ph: (03) 341-0242

Fax: (03) 341-0243

PIPE PENETRATION DETAILS (CONTINUED)

DIAGRAM


Version 1-3


TIMSPEC




AUCKLAND


Ph: (09) 620-0260

Fax: (09) 620-0261

CARTERTON

30 Kent Street

Ph: (06) 379-9381

Fax: (06) 379-9382

CHRISTCHURCH


Ph: (03) 341-0242

Fax: (03) 341-0243

METER BOX

HEAD

METHOD

An additional layer of building wrap is required to lap over the „Z‟ flashing to direct water

outwards from the wall. The „Z‟ flashing is to be riveted and sealed to the meterbox top

flashing with minimum 10mm cover. The top flashing must also be riveted and sealed to the

meterbox.

It is important to install a flexible air seal to all sides of the meterbox. This must be a self-

expanding polyurethane foam or sealant installed over a closed cell polyethylene foam (PEF)

backing rod or a similar backing rod.

The self-expanding polyurethane foam or sealant used, must meet one of the following

requirements:

Type F, Class 20LM of ISO 11600; or

Class 25LM of ISO11600; or

Low modulus Type II, Class A of Federal Specification TT-S-00230c.


Version 1-3


TIMSPEC




AUCKLAND


Ph: (09) 620-0260

Fax: (09) 620-0261

CARTERTON

30 Kent Street

Ph: (06) 379-9381

Fax: (06) 379-9382

CHRISTCHURCH


Ph: (03) 341-0242

Fax: (03) 341-0243

METER BOX (CONTINUED)

HEAD (CONTINUED)

DIAGRAM


Version 1-3


TIMSPEC




AUCKLAND


Ph: (09) 620-0260

Fax: (09) 620-0261

CARTERTON

30 Kent Street

Ph: (06) 379-9381

Fax: (06) 379-9382

CHRISTCHURCH


Ph: (03) 341-0242

Fax: (03) 341-0243


JAMB

DIAGRAM


Version 1-3


TIMSPEC




AUCKLAND


Ph: (09) 620-0260

Fax: (09) 620-0261

CARTERTON

30 Kent Street

Ph: (06) 379-9381

Fax: (06) 379-9382

CHRISTCHURCH


Ph: (03) 341-0242

Fax: (03) 341-0243


SILL

DIAGRAM


Version 1-3


TIMSPEC




AUCKLAND


Ph: (09) 620-0260

Fax: (09) 620-0261

CARTERTON

30 Kent Street

Ph: (06) 379-9381

Fax: (06) 379-9382

CHRISTCHURCH


Ph: (03) 341-0242

Fax: (03) 341-0243

SITE CLEAN-UP

After completion the installer is to leave the site in a clean and tidy manner, including:

1. Replacing or repairing any damaged or marked items; and

2. Removing all rubbish, debris and unused items from the building site.

Any treated and/or coated timber off-cuts or rubbish are to be disposed with according to

local council requirements.

Note: Accoya ® wood is not treated with dangerous chemicals and can be disposed by burning, or as untreated timber at refuse

sites.


Version 1-3


TIMSPEC




AUCKLAND


Ph: (09) 620-0260

Fax: (09) 620-0261

CARTERTON

30 Kent Street

Ph: (06) 379-9381

Fax: (06) 379-9382

CHRISTCHURCH


Ph: (03) 341-0242

Fax: (03) 341-0243

ON-GOING MAINTENANCE

It is the building owner‟s responsibility to ensure that the cladding system receives regular

maintenance so that it continues to perform at its required level.

MAINTENANCE INTERVAL

For most areas (especially coastal, industrial, and inner-city area) maintenance should be

performed at least once every 12 months. Maintenance may be required as often as once

every six months, depending on the level of pollution, dirt and dust in the environment.

For sheltered, inland locations, maintenance should be performed once every 12 to 18 months.

MAINTENANCE REQUIREMENTS

Regular maintenance is to include the following 5 steps:

1. Wash all exterior surfaces with low pressure water to remove dust, dirt and other

contaminants;

a. Extra attention should be given to areas that are not exposed to rain such as

sheltered areas below eaves;

b. Do not direct high pressure water at any part of the cladding system, especially

sensitive junctions such as joinery surrounds and other flashings were you must

avoid forcing water past anti-capillary gaps and flashings into the wall cavity.

2. Use a soft bristle brush or broom with water and an appropriate cleaning agent (refer to

paint manufacturer for correct cleaning agent specific to their paint system) to remove

stubborn or persistent dirt and contaminants.


Version 1-3


TIMSPEC




AUCKLAND


Ph: (09) 620-0260

Fax: (09) 620-0261

CARTERTON

30 Kent Street

Ph: (06) 379-9381

Fax: (06) 379-9382

CHRISTCHURCH


Ph: (03) 341-0242

Fax: (03) 341-0243

ON-GOING MAINTENANCE (CONTINUED)

MAINTENANCE REQUIREMENTS (CONTINUED)

3. Inspect all surfaces and junctions for signs of damage, wear-and-tear, or coating

breakdown. Where coating surface has broken or remedial action is required:

a. Remove all damaged or loose coating (may involve sanding back to solid timber);

b. Spot prime any bare timber (if repairing paint);

c. Recoat with minimum two coats of the product originally used to initially overcoat

the timber.

4. Repairing or replacing any damaged or deteriorated items in order to preserve the

weathertightness of the building:

a. Small isolated areas of dry rot in timber can be cut out and filled then primed and

coated;

b. For larger areas of deterioration: remove and replace either the damaged section

or the entire board for any deteriorated timber boards either (includes scribers,

cover boards and weatherboards). Prime and coat the replacements as required;

c. Other items (soakers, flashings and cappings) may need to be replaced in their

entirety.

5. Where a coating is applied, periodic recoating is required to ensure the integrity of the

coating is sustained. This will generally mean applying another exterior coat every 4 to

10 years (dependant on the coating used and building location) after washing and

maintenance.

Timspec CERTCLAD Bevel Back Cavity System … Back - Cavity/CERTCLAD Bevel... · Timspec CERTCLAD...

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Transcript of Timspec CERTCLAD Bevel Back Cavity System … Back - Cavity/CERTCLAD Bevel... · Timspec CERTCLAD...