Tips & Installation

Builders' tips & information

 

Always adhere to highest industry standards and best practices when installing Niagara products. 

 



Do not install weatherboards, fascia or mouldings with a moisture content over 14%. We will not warrant any product that has not been maintained in accordance with our warranty specifications. 

Handling and storage

 

Unload timber products carefully by hand from the truck, or by using a mechanical lifting device. Never drag boards across the ground. To avoid bending, always carry individual boards on their edges. 

To minimise board distortion and moisture uptake all Niagara products must be stored in a dry, well-ventilated area, stacked on a flat surface at least 150mm above the ground, covered and out of direct sunlight and rain.

Moisture uptake before installation

 

Kiln dried radiata pine timber is hygroscopic. It will absorb moisture in a damp environment and release it in a dry environment (even when primed).

If timber absorbs moisture, some dimensional swelling may occur, which will disappear when the timber returns to its original moisture content. If the product shows signs of dimensional swelling allow time for it to dry out and return to the manufactured dimensions before installation.

All end cuts, notches, rebates and drill holes must be resealed with a suitable end-sealing product such as Envira Fast Dry End Seal. 

Proper application and nailing practices are essential for maximising the product performance and appearance. 

All nailing should be over studs with at least 35mm penetration into the frame. Nailing should be such that it does not restrict normal seasonal movement, so do not nail through overlapping pieces.

Selection of proper nails is important. 
Use Jolt Head (JH) hot-dipped galvanised or stainless steel annular grooved, for fixing either directly into framing or structural batten.
Do not use plain or electroplated nails.
Hot dipped galvanising must meet the requirements of AS/NZS 4680:2006.

Hand nailing is recommended as nail guns can cause damage to the surface of the board. If a nail gun is used a non-marking attachment should be used to avoid damage to the board surface. Nails are to be countersunk (punched) by 2mm and must be filled immediately to avoid moisture uptake around the nail head.

Pre-drilling near the ends is recommended as a precaution to avoid the possibility of end splitting. We recommend the use of scarf joints. Butt joints can be used without an expansion gap, but these must be flashed. Joints should be staggered up the wall. Scarf joints should face away from the prevailing winds.

Envira-Bevel-Back-Nailing-Schedule

Rusticated-Nailing-Schedule

Prime all nail holes with a suitable premium exterior wood primer and fill holes with an exterior grade wood filler.

Sealants must not be relied upon for primary weather protection, they are used to assist with weathering at joint and laps only.

All filled areas must be spot-primed prior to top coating. 

The primer will not protect against the possibility of moisture uptake, which can result in dimensional swelling.

To avoid shrinkage lines it is essential that if swelling is evident, the product should be given time to dry out and return to its equilibrium moisture content and manufactured dimensions before application of any final coating system. 

Application of the first top coat prior to installation will help protect against moisture uptake during construction.

Use colours with a Light Reflectance Value (LRV) of 45 or more and with a gloss level of above 10%. Timber is a natural product and resin is a natural constituent of the pine species.

Resin bleed is rare,but will most likely occur in hot conditions, or where the product has been painted a darker colour. In the case of a resin bleed the following is offered as a guide:
1. Scrape off exposed resin.
2. Wipe with a cloth damp with solvent - mineral turpentine is ideal.
3. Sand back exposed area.
4. Apply Zinsser BIN Primer Sealer, following the instructions on the product.
5. Allow to dry.
6. Apply two coats of premium exterior grade paint.

Two top coats of quality house paint should be applied within six weeks of the product being installed. Irrespective of when the top coats are applied, ensure all loose material and dirt is removed. Some sanding and spot priming may be required.  

It is the painter’s responsibility to ensure all surfaces are prepared correctly prior to painting, including ensuring the primer is well adhered to the timber substrate and all surfaces are in a suitable condition for subsequent top coats.      

Do not top coat timber that has moisture-related dimensional swelling as this will help avoid shrinkage lines that may occur as the timber returns to its equilibrium moisture content and original machined dimension. This applies especially to weatherboards and fascia.

All preparation and painting shall be carried out in a good tradesman-like manner and to the requirements of the current AS/NZS 2311 Guide to Painting of Buildings, paint manufacturer’s data sheets and to be applied by applicators with the necessary equipment and experience, and under the appropriate environmental conditions to ensure that the potential of the paint system is maximised. 

For weatherboard painting guidelines click here.

All painted exterior surfaces should be washed at least once a year. Do not use a water blaster. Up to 10 years can be expected before a repaint is required, however this will depend on the colour, type and quality of the top coat and the preparation of the surface prior to applying the first top coats. 

To ensure timber products achieve the durability and long life you expect, it is essential a protective paint system is maintained in good condition and not allowed to deteriorate.

Visit the 'Caring for your paint' page on the Resene website for additional advice:
http://www.resene.co.nz/homeown/probsolv/prob9.htm

Refer to: BRANZ Good Practice Guide Timber Cladding • NZS3604 & E2/AS1.

Envira-Bevel-Back-weatherboard-measurement-table

1.1 Scope and general comment

These instructions are specific and can be used for buildings that fall within the scope of NZS 3604:2012 Timber Framed Buildings and E2/AS1.  Buildings that have a weathertightness risk score of more than 6 as assessed in E2/AS1 section 3 will require a drained and ventilated cavity.

Niagara’s Envira Weatherboard System must be fixed to framing that is dry (<20% mc), straight and stable.  Flashings as shown in the installation CAD drawings must be used.

All building sites are different and while these instructions are detailed, only those details that apply to your specific building site should be used.

When used in combination, timber framed windows and timber cladding are not covered by E2/AS1 and application for an alternative solution to New Zealand Building Code Clause E2 must be made to the Building Consent Authority.

1.2 Storage

Correct storage of Envira Weatherboard System components prior to installation is critical.  Store as follow:
•    in a dry well ventilated area
•    on a flat surface supported every meter along the length of the product
•    clear of the ground by at least 150mm
•    protected from the elements including direct sunlight and rain
•    if rising damp is likely, place a moisture barrier under the stack
•    use inside storage where available

1.3 Handling

Unload Envira Weatherboard System products carefully from truck by hand or use a mechanical lifting device.  Never drag boards across the ground.
To avoid bending, always carry individual boards on their edge.
During handling (cutting, installation etc.) care should be taken to avoid damaging the surface of the board.

1.4 Keep dry

Envira Weatherboard System products are made from kiln dried timber.
Timber is hydroscopic and it will absorb moisture in a damp environment and release it in a dry environment.  Primers will not stop moisture uptake.  If timber absorbs moisture prior to installation, some dimensional swelling may occur, this will disappear when the timber returns to its original moisture content.

If product shows signs of dimensional swelling, allow time for it to dry and return to the manufactured dimensions before installation.

1.5 Wall underlay

Use only underlays that meet the requirements of E2/AS1 Table 23.
Underlays are a secondary protective barrier against weathering and must be installed in accordance with E2/AS1 section 9.1.7.

1.6 Flashings

Refer to NZS 3604 section 4 and E2/AS1 Table 20 for durability requirements and E2/AS1 section 9 for flashing design and fabrication details.
As recommended in E2/AS1, window and door suppliers are responsible for head flashings.
A layer of kraft paper is required between the flashing and timber framing where the timber has been treated with a copper-based treatment.
Check the flashing manufacturer’s recommendations in all cases.

1.7 Sealants

All sealants must be suitable for exterior use and while they will assist with providing weathertightness at laps and joints they must not be relied on to provide total protection.

1.8 Air seals

Air seals are a barrier that prevent air flowing through the cladding or circulating within the cavity, from entering the building.  Air seals are required where a hole or penetration through the external cladding occurs - windows, doors, pipes, meter boxes etc.
See E2/AS1 for complete building air seal requirements.

A backing rod of a suitable diameter must be installed in the gap between the window/door reveal, meter box or pipe and the opening frame prior to applying the sealant.  Take care not to over fill the space with sealant.   

Backing rods and sealants must be used in accordance with the manufacturer’s instructions.  See E2/AS1 for details.

1.9 Building preparation

NZS 3604 sets out the requirements that timber framing must meet including sizing, spacings, straightness (Table 2.1) and moisture content.
All framing must meet these requirements before installation of Envira Weatherboard System can begin.
Ensure all openings are framed out with the correct clearance between the trimmed opening and the window/door/meter box frame.

1.10 Wall cladding cavities

If the weathertightness risk score is higher than 6 a drained and ventilated cavity will be required between the underlay and Envira bevel back weatherboards.

If a cavity is required, structurally fix Envira treated cavity battens to the framing in accordance with BRANZ Bulletin 475. Cavity construction, including flashing and vermin proofing, must be in accordance with the requirements as set out in E2/AS1 and NZS 4229.

2.1 Envira bevel back weatherboard fixings and fixing method

Using an Envira tilt fillet, position and fix the bottom Envira weatherboard ensuring there is a minimum 50mm overlap below the bottom plate or bearer.  The tilt fillet will provide the correct layback angle for the bottom board.

Correct positioning of each successive board (32mm lap) is critical to ensure finishing scribers fit correctly.  Use an Envira precut scriber as a storey rod to assist in this process.  (Keep this rod dry at all times to maintain its correct dimensions).

Each Envira weatherboard will be fixed with one nail at every batten or stud, starting in the middle of the board and working to the ends.  Single point nailing will allow the board to expand and contract as Equilibrium Moisture Content change occurs.  Fixings are to be located 40mm above the lower edge of the board penetrating 35mm into the framing or structural batten.

Use 75 x 3.15 JH hot-dipped galvanised or annular grooved stainless steel nails for fixing either directly into framing or structural battens.

Re-prime the cut ends with two coats of a premium quality timber primer, allowing to dry between coats.

Nails must be hand driven and punched below the surface to allow for filling.  Fill with an exterior grade wood filler immediately after nailing.  Avoid using nail guns as they can damage the surface of the board.  Pre-drill nail holes at all joints and within 50mm of ends.

The top board may have to be cut to suit soffit.

2.2 Joins

Avoid joining Envira weatherboards whenever possible but if joining is unavoidable, only use 45 degree scarf joints directly over studs or Envira structural battens.

Face the overlapping board away from the prevailing weather direction using one fixing through the overlapping board (pre-drill the hole).  Re-prime the cut ends with two coats of a premium quality timber primer, allowing to dry between coats.

Nails should be hand driven and punched below the surface to allow for filling.  Prime then fill with an exterior grade wood filler immediately after nailing.

2.3 External box corner

Using 50 x 2.5mm JH hot-dipped galvanized or annular grooved stainless steel nails, fix the Envira two piece prefabricated external box corner over the Envira bevel back weatherboards. Use two nails at each fixing point. There must be a minimum 50mm cover on both faces of the corner.

Fixings must be located 35-40mm above the lower edge of the overlapping board on every fourth board for 142mm wide weather boards and every third board for 187mm wide weatherboards.  For nails near the ends of the corner boards pre-drill the nail holes.

Fit a precut EnviraScribe over the weatherboards against the corner boards.  Pre-drill holes and using 60 x 2.8mm (40 x 18 scriber) or 50 x 2.5mm (40 x 10 scriber) JH hot-dipped galvanised or annular grooved stainless steel nails, fix the scriber firmly against the box corner.  Nail at 450mm centres.

Re-prime the cut ends with two coats of a premium quality timber primer, allowing to dry between coats.

Nails must be hand driven and punched below the surface to allow for filling.  Prime then fill with an exterior grade wood filler immediately after nailing.

2.4 Internal box corner

Internal corners, direct or cavity, must have a flashing behind the cladding that provides a minimum 50mm cover to both faces of the corner.  Refer to E2/AS1 for full details. Using 50 x 2.5mm JH hot-dipped galvanised or annular grooved stainless steel nails, fix the Envira two piece prefabricated internal box corner over the Envira bevel back weatherboards.  Use two nails at each fixing point.  The Envira internal box corner provides 100mm cover on both faces of the corner.

Fixings must be located 35-40mm above the lower edge of the overlapping board on every fourth board for 142mm wide Envira bevel back weatherboards and every third board for 187mm wide weatherboards.
Use two nails at each fixing point.  For nails near the ends of the corner boards pre drill the nail holes.

Fit a precut EnviraScribe over the weatherboards.  Pre-drill holes and using 60 x 2.8mm (40 x 18) or 50 x 2.5mm (40 x 10)  JH hot-dipped galvanised or annular grooved stainless steel nails, fix the scriber firmly against the box corner.  Nail at 450mm centres.

Re prime the cut ends with two coats of a premium quality timber primer, allowing to dry between coats.

Nails must be hand driven and punched below the surface to allow for filling.  Prime then fill with an exterior grade wood filler immediately after nailing.

2.5 Aluminium window and door jambs

Window and door openings are a high weathertightness risk area and require particular attention to ensure weathertightness is achieved.  All window and door openings must be constructed and trimmed in accordance with E2/AS1.  All flashings, air seals, underlay and flexible flashing tapes must be in place.
For flashing details refer to NZS 3604 section 4 and E2/AS1 table 20 for durability requirements and E2/AS1 for flashing design and fabrication details.

As recommended in E2/AS1, window and door suppliers are responsible for head flashings.

The following instructions apply to aluminium windows and doors as set out in E2/AS1 9.1.10  -  9.1.10.8.

All windows must comply with NZS 4211 including consideration of the building location.

The aluminum facing flange must overlap the cladding (Envira  weatherboard) by at least 10mm for jambs and at least 8mm for sills.

Fit firmly against the flange either an EnviraScribe or an Envira facing board and EnviraScribe combination.  Pre-drill holes in the scriber and fix using 60 x 2.8mm JH hot-dipped galvanised or annular grooved stainless steel nails.  Nail at 450mm centres.

Facing board fixings must be located 35-40mm above the lower edge of the overlapping board on every forth board for 142mm wide weatherboards and every third board for 187mm wide weatherboards.  Use two nails at each fixing point.  For nails near the ends of the corner boards pre-drill the nail holes.

Direct fixed and cavity fixed cladding applications must have a sill tray flashing a minimum of the full width of the opening.

Re-prime the cut ends with two coats of a premium quality timber primer, allowing to dry between coats.

Nails must be hand driven and punched below the surface to allow for filling.  Prime then fill with an exterior grade wood filler immediately after nailing.

Fit air seals around all window and door openings as specified.

2.6 Aluminium window and door sills

The Envira Weatherboard System requires a full width sill tray for direct fixed windows and doors, which meets the requirements of E2/AS1. If an Envira sill (plant on) is to be used, ensure the positioning of the sill does not compromise the sill flashing detail or function.  The sill tray must extend at least 8mm behind the line of the aluminium frame.

In a cavity fix application, all doors and windows with a trim opening wider than 600mm require an appropriate sill support bar conforming to EM6, paragraph 9.1.10.5

2.7 Aluminium  window and door heads

Direct and cavity fixed aluminium windows and doors require a flashing that meets the requirements of E2/AS1.  The flashing must be fitted behind the cladding with a 5mm gap between the bottom edge of the cladding and the horizontal surface of the flashing. If an Envira Head Trim is to be used there must be a 5mm gap between the bottom edge of the head trim and the horizontal surface of the flashing.

2.8 Timber window and door openings

When used in combination, timber framed windows and timber cladding are not covered by E2/AS1 and application for an Alternative Solution to New Zealand Building Code  Clause E2 must be made to the Building Consent Authority.  Timber window and door installations must include facings boards and scribers when used in combination with the Envira Weatherboard System.

Envira-Bevel-Back-Nailing-Schedule

Envira-Rusticated-weatherboard-measurement-table

1.1 Scope and general comment

These instructions are specific and can be used for buildings that fall within the scope of NZS 3604:2012 Timber Framed Buildings and E2/AS1.  Buildings that have a weathertightness risk score of more than 6 as assessed in E2/AS1 section 3 will require a drained and ventilated cavity.

Niagara’s Envira Weatherboard System must be fixed to framing that is dry (<20% mc), straight and stable.  Flashings as shown in the installation CAD drawings must be used.

All building sites are different and while these instructions are detailed, only those details that apply to your specific building site should be used.

When used in combination, timber framed windows and timber cladding are not covered by E2/AS1 and application for an alternative solution to New Zealand Building Code Clause E2 must be made to the Building Consent Authority.

1.2 Storage

Correct storage of Envira Weatherboard System components prior to installation is critical.  Store as follow:
•    in a dry well ventilated area
•    on a flat surface supported every meter along the length of the product
•    clear of the ground by at least 150mm
•    protected from the elements including direct sunlight and rain
•    if rising damp is likely, place a moisture barrier under the stack
•    use inside storage where available

1.3 Handling

Unload Envira Weatherboard System products carefully from truck by hand or use a mechanical lifting device.  Never drag boards across the ground.
To avoid bending, always carry individual boards on their edge.
During handling (cutting, installation etc.) care should be taken to avoid damaging the surface of the board.

1.4 Keep dry

Envira Weatherboard System products are made from kiln dried timber.
Timber is hydroscopic and it will absorb moisture in a damp environment and release it in a dry environment.  Primers will not stop moisture uptake.  If timber absorbs moisture prior to installation, some dimensional swelling may occur, this will disappear when the timber returns to its original moisture content.

If product shows signs of dimensional swelling, allow time for it to dry and return to the manufactured dimensions before installation.

1.5 Wall underlay

Use only underlays that meet the requirements of E2/AS1 Table 23.
Underlays are a secondary protective barrier against weathering and must be installed in accordance with E2/AS1 section 9.1.7.

1.6 Flashings

Refer to NZS 3604 section 4 and E2/AS1 Table 20 for durability requirements and E2/AS1 section 9 for flashing design and fabrication details.
As recommended in E2/AS1, window and door suppliers are responsible for head flashings.
A layer of kraft paper is required between the flashing and timber framing where the timber has been treated with a copper-based treatment.
Check the flashing manufacturer’s recommendations in all cases.

1.7 Sealants

All sealants must be suitable for exterior use and while they will assist with providing weathertightness at laps and joints they must not be relied on to provide total protection.

1.8 Air seals

Air seals are a barrier that prevent air flowing through the cladding or circulating within the cavity, from entering the building.  Air seals are required where a hole or penetration through the external cladding occurs - windows, doors, pipes, meter boxes etc.
See E2/AS1 for complete building air seal requirements.

A backing rod of a suitable diameter must be installed in the gap between the window/door reveal, meter box or pipe and the opening frame prior to applying the sealant.  Take care not to over fill the space with sealant.   

Backing rods and sealants must be used in accordance with the manufacturer’s instructions.  See E2/AS1 for details.

1.9 Building preparation

NZS 3604 sets out the requirements that timber framing must meet including sizing, spacings, straightness (Table 2.1) and moisture content.
All framing must meet these requirements before installation of Envira Weatherboard System can begin.
Ensure all openings are framed out with the correct clearance between the trimmed opening and the window/door/meter box frame.

1.10 Wall cladding cavities

If the weathertightness risk score is higher than 6 a drained and ventilated cavity will be required between the underlay and Envira rusticated weatherboards.

If a cavity is required, structurally fix Envira treated cavity battens to the framing in accordance with BRANZ Bulletin 475. Cavity construction, including flashing and vermin proofing, must be in accordance with the requirements as set out in E2/AS1 and NZS 4229.

2.1 Envira rusticated weatherboard fixings and fixing method

Position and fix the bottom Envira weatherboard ensuring there is a minimum 50mm overlap below the bottom plate or bearer.

Correct positioning of each successive board (25mm lap) is critical to ensure finishing scribers fit correctly. Use an Envira rusticated precut scriber as a storey rod to assist in this process.   (Keep this rod dry at all times to maintain its correct dimensions.)

Each Envira weatherboard will be fixed with one nail at every batten or stud, starting in the middle of the board and working to the ends.  Single point nailing will allow the board to expand and contract as EMC change occurs.  Allow a 3mm expansion gap at the overlap between boards.
Fixings are to be located between 35-40mm above the lower edge of the board penetrating 35mm into the framing or structural batten.

Use 60 x 2.8mm JH hot-dipped galvanised or annular grooved stainless steel nails for fixing either directly into framing or structural battens.

Re-prime the cut ends with two coats of a premium quality timber primer, allowing to dry between coats.

Nails must be hand driven and punched below the surface to allow for filling.  Fill with an exterior grade wood filler immediately after nailing.  Avoid using nail guns as they can damage the surface of the board.
Pre-drill nail holes at all joints and within 50mm of ends.

The top board may have to be cut to suit soffit. Finish detail using an Envira eaves mould.

2.2 Joins

Avoid joining Envira weatherboards whenever possible but if joining is unavoidable, only use 45 degree scarf joints directly over studs or Envira structural battens.

Face the overlapping board away from the prevailing weather direction using one fixing through the overlapping board (pre-drill the hole).
Re-prime the cut ends with two coats of a premium quality timber primer, allowing to dry between coats

Nails should be hand driven and punched below the surface to allow for filling.  Prime then fill with an exterior grade wood filler immediately after nailing.

2.3 External box corner

Using 50 x 2.5mm JH hot-dipped galvanized or annular grooved stainless steel nails, fix the Envira External box corner (pre-fabricated) over the Envira rusticated weatherboards. Use two nails at each fixing point.  There must be a minimum 50mm cover on both faces of the corner.

Fixings must be located 35-40mm above the lower edge of the overlapping board on every fourth board for 142mm wide weather boards and every third board for 187mm wide weatherboards.  For nails near the ends of the corner boards pre-drill the nail holes.

Fit a pre-cut EnviraScribe (30 x 18, 27 x 18) over the weatherboards against the corner boards.  Pre-drill holes and using 60 x 2.8mm JH hot-dipped galvanised or annular grooved stainless steel nails, fix the scriber firmly against the box corner.  Nail at 450mm centres.

Re-prime the cut ends with two coats of a premium quality timber primer, allowing to between coats.

Nails must be hand driven and punched below the surface to allow for filling.  Prime then fill with an exterior grade wood filler immediately after nailing.

Envira Rustic Plugs can be used in place of a scriber.

2.4 Internal box corner

Internal corners, direct or cavity must have a flashing behind the cladding provide a minimum 50mm cover to both faces of the corner.  Refer to E2/AS1 for full details. Using 50 x 2.5mm JH hot-dipped galvanised or annular grooved stainless steel nails, fix the Envira two piece prefabricated internal box corner over the Envira rusticated weatherboards.  Use two nails at each fixing point.  The Envira internal box corner provides 100mm cover on both faces of the corner.

Fixings must be located 35-40mm above the lower edge of the overlapping board on every fourth board for 142mm wide Envira rusticated weatherboards and every third board for 187mm wide weatherboards.  Use two nails at each fixing point.  For nails near the ends of the corner boards pre-drill the nail holes.

Fit a pre-cut EnviraScribe over the weatherboards.  Pre-drill holes and using 60 x 2.8mm JH hot dip galvanised or annular grooved stainless steel nails, fix the scriber firmly against the box corner.
Nail at 450mm centres.

Re-prime the cut ends with two coats of a premium quality timber primer, allowing to dry between coats.

Nails should be hand driven and punched below the surface to allow forfilling.  Prime then fill  with an exterior grade wood filler immediately after nailing.

Envira Rustic Plugs can be used in place of a scriber.

2.5 Aluminium window and door jambs

Window and door openings are a high weathertightness risk area and require particular attention to ensure weathertightness is achieved.  All window and door openings must be constructed and trimmed in accordance with E2/AS1.  All flashings, air seals, underlay and flexible flashing tapes must be in place.
For flashing details refer to NZS 3604 section 4 and E2/AS1 table 20 for durability requirements and E2/AS1 for flashing design and fabrication details. As recommended in E2/AS1, window and door suppliers are responsible for head flashings.

The following instructions apply to aluminium windows and doors as set out in E2/AS1 9.1.10  -  9.1.10.8.

All windows must comply with NZS 4211 including consideration of the building location.

The aluminum facing flange must overlap the cladding (Envira weatherboard) by at least 10mm for jambs and at least 8mm for sills.

Fit firmly against the flange either an EnviraScribe or an Envira facing board and EnviraScribe combination.  Pre-drill holes in the scriber and fix using 60 x 2.8mm JH hot-dipped galvanised or annular grooved stainless steel nails. 
Nail at 450mm centres.

Facing board fixings must be located 35-40mm above the lower edge of the overlapping board on every fourth board for 142mm wide weatherboards and every third board for 187mm wide weatherboards.  Use two nails at each fixing point.  For nails near the ends of the corner boards pre-drill the nail holes.

Direct fixed and cavity fixed cladding applications must have a sill tray flashing a minimum of the full width of the opening.

Re-prime the cut ends with two coats of a premium quality timber primer, allowing to dry between coats.

Nails must be hand driven and punched below the surface to allow for filling.  Prime then fill with an exterior grade wood filler immediately after nailing.

Fit air seals around all window and door openings as specified.

2.6 Aluminium window and door sills

The Envira Weatherboard System requires a full width sill tray for direct fixed windows and doors, which meets the requirements of E2/AS1. If an Envira sill (plant on) is to be used, ensure the positioning of the sill does not compromise the sill flashing detail or function.  The sill tray must extend at least 8mm behind the line of the aluminium frame.

In a cavity fix application, all doors and windows with a trim opening wider than 600mm require an appropriate sill support bar conforming to EM6, paragraph 9.1.10.5

2.7 Aluminium  window and door heads

Direct and cavity fixed aluminium windows and doors require a flashing that meets the requirements of E2/AS1.  The flashing must be fitted behind the cladding with a 5mm gap between the bottom edge of the cladding and the horizontal surface of the flashing. If an Envira Head Trim is to be used there must be a 5mm gap between the bottom edge of the head trim and the horizontal surface of the flashing.

2.8 Timber window and door openings

When used in combination, timber framed windows and timber cladding are not covered by E2/AS1 and application for an Alternative Solution to New Zealand Building Code  Clause E2 must be made to the Building Consent Authority.  Timber window and door installations must include facings boards and scribers when used in combination with the Envira Weatherboard System.

Rusticated-Nailing-Schedule