Triclad Lapped Weatherboard June 2013

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1 Triclad Lapped Weatherboard June Ph TRICLAD 1

2 Please note it is the responsibility of the Specifier and the party responsible for the project, to make sure they have the latest version of the Technical Manual. The latest version will always be available on our website Contents 1. Application and Scope 1.1 Application 1.2 Scope 1.3 Detail 1.4 Specific Design 2. Components 2.1 Profiles 2.2 Flashings 2.3 Primer 3. Nail Requirements 4. Design 4.1 Compliance 4.2 Responsibility 4.3 Clearance 5. Framing 5.1 Framing Grade 5.2 Dimensions 5.3 Treatment 5.4 Construction 6. Wall Underlay 6.1 Flexible Wall Underlay 6.2 Rigid Wall Underlay 7. Cavity Battens 8. Vermin Proofing 9. Flashings 10. Triclad Laps 10.1 Horizontal Laps 11. Cut Ends 12. Sealants 13. Durability Year Durability Ph TRICLAD 2

3 Year Durability 14. Coatings 15. Maintenance 16. Handling and Storage 17. Drawing Directory Ph TRICLAD 3

4 1. Application and Scope 1.1. Application Triclad Weatherboards are made from 12 and 17mm S grade bandsawn plywood. They are LOSP treated and pre-primed. Under NZS3604 Triclad weatherboard is classed as a lightweight cladding product. Triclad Lapped Weatherboard Triclad Lapped Weatherboard has a Bandsawn Finish and is available in thicknesses of 12mm and 17mm with four different widths available- 145mm, 190mm, 230mm and a 295mm (which is only available in 17mm thickness) with all coming in 4.8metre lengths Scope This specification covers the use of Triclad Weather Boards that fall within the scope of NZS This specification covers the use of Triclad Weatherboards in both direct fixed and cavity construction methods and is limited to the materials, products and processes contained herein, for buildings within the scope of NZS 3604: Up to 3 storey s with a height measured from lowest ground level adjacent to the building to the highest point of the roof (except for chimneys, aerials and the like) of 10 m or less, and With floor plan area limited only by seismic and structural control joints, and External walls that are vertical, and roofs that are 60º or less above the horizontal. Where buildings are based on NZS 3604, but require specific engineering design input, the framing shall be of at least equivalent stiffness to the framing provisions of NZS Detail Triclad Weatherboards details are provided in the details section of this document. The CAD files are available on the Triclad website at Specific Design For the use of Triclad Weatherboard outside the scope of this document, the Architect Designer or Engineer must undertake specific design. For advice on designs outside the scope of this specification, ask Triclad on Ph TRICLAD 4

5 2. Components 2.1. Profiles Ph TRICLAD 5

6 2.2. Treatment. Triclad Weatherboards are treated with Vascol Azure. Vacsol Azure Concentrate is a Light Organic Solvent Preservative (LOSP) which must be diluted with white spirits to the correct working strength, in accordance with mixing instructions given in Section 3. Vacsol Azure, RTU (Ready to Use) is specifically formulated for the treatment of timber to AS H3 hazard level (external above ground) providing protection against fungal decay and attack from borer and termites. Vacsol Azure is suitable for AWPA UC3A applications in the USA (EPA Ref. No ). Vacsol Azure is also approved for H3.1 applications in NZ (NZS3640:2004) Primer Triclad Weatherboard uses an Alkyd wood primer called PPG 839 Enduraprime. PPG 839 Enduraprime is a high quality wood primer formulated as a timber mill factory applied primer and has been sold in this market for more than 20 years, establishing and maintaining its proven performance. 3. Nail Fixing Requirements Nail lengths are designed for a minimum penetration of 35mm into framing. If thickness of batten or cladding is varied length shall be adjusted. Description Profile Dimensions (mm) Nail Size Direct Fix(mm) Triclad Weatherboard 145 x 12 60mm x 2.8mm AG FH* Triclad Weatherboard 190 x 12 60mm x 2.8mm AG FH* Triclad Weatherboard 230 x 12 60mm x 2.8mm AG FH* Triclad Weatherboard 145 x 17 70mm x 2.8mm AG FH* Triclad Weatherboard 190 x 17 70mm x 2.8mm AG FH* Triclad Weatherboard 230 x 17 70mm x 2.8mm AG FH* Triclad Weatherboard 295 x 17 70mm x 2.8mm AG FH* Nail Size On 20mm Cavity(mm) 90mm x 3.15mm AG FH* 90mm x 3.15mm AG FH* 90mm x 3.15mm AG FH* 90mm x 3.15mm AG FH* 90mm x 3.15mm AG FH* 90mm x 3.15mm AG FH* 90mm x 3.15mm AG FH* AG = Annular Grooved, FH = Flathead Nail Fixing material for Triclad Weatherboards in accordance with Table 4.3 of NZS3604 are as follows. a) Zone B- Galvanised Steel or Stainless Steel or Silicon Bronze. b) Zone C- Galvanised Steel or Stainless Steel or Silicon Bronze. c) Zone D- Stainless Steel or Silicon Bronze. Zone D includes all offshore islands, the area within 500m of the coastline of New Zealand. As per Section of NZ3604 Microclimate Considerations. Significant acceleration of the corrosion rate of structural fasteners and fixings beyond what could be expected from the geographical location can occur in the following circumstances and require a Specified Engineered Design. a) Industrial contamination and corrosive atmospheres b) Contamination from agricultural chemicals or fertilizers; and c) Geothermal hot spots. Hot spots are defined as being within 50m of a bore, mud pool, steam vent or other source. 4. Design Ph TRICLAD 6

7 4.1. Compliance Triclad weatherboards comply with NZBC Responsibility The specifiers or other party responsible for the project must ensure that the information and details in this specification are appropriate for the intended application and that additional detailing is performed for specific design or any areas that fall outside the scope of this technical specification. For applications outside the scope of this literature and details which are not provided herein, the architect, designer or engineer must undertake specific design and it should be ensured that the intent of their design meets the requirements of the NZBC Clearance Clearance at concrete slab level, The base of the Triclad Weatherboard system in accordance NZS3604 and Clause E2- External Moisture of the NZBC shall: Finish a minimum of: o 100 mm above a paved surface, or o 175 mm above finished unpaved surface, Overlap the concrete slab by 50 mm, and Be offset horizontally by a minimum of 6 mm for Direct Fixed Triclad Weather board to prevent capillary action Clearance for timber floor framing, Suspended timber floors shall meet the requirements of NZS Clearances from paved and unpaved surfaces to the wall framing shall be in accordance with NZS 3604 and Clause E2- External Moisture of the NZBC. At ground floor level, the base of the cladding system shall: Overlap the timber floor structure by 50 mm minimum, and For walls with direct fixed claddings, be offset horizontally from a concrete foundation wall by a minimum of 6 mm Have no direct connection between sub floor spaces and drained cavities 5. Framing 5.1. Framing Grade. In accordance with NZS 363 New Zealand Timber Grading rules, No.1 framing or MSG6 grade is the minimum requirement to be used Dimensions. A minimum stud size of 90 x 45mm is required Treatment. Minimum treatment to be H1.2. Refer to NZS3604 for further information on minimum treatment selection and requirements Construction. All timber framing must comply with NZS3604. Cavity Construction Method Studs at 400mm centres with nogs (must be at 800mm centres minimum ) On internal corners double studs are required. Ph TRICLAD 7

8 On external corners additional packing may be needed Direct Fix Construction Method Studs at 400mm centres with nogs (must be at 800mm centres minimum ) 6. Wall Underlay 6.1. Flexible wall underlay Shall be in accordance with Table 23 of E2/AS1, and shall: Be run horizontally, Have upper sheets lapped over lower sheets to ensure that direction of laps will allow water to be shed to outside of the wall underlay, Be lapped not less than 75 mm at horizontal joints, Be lapped not less than 150 mm over studs at vertical joints, and Extend 35 mm below bottom plate or bearer, Be restrained from bulging into a drained cavity 6.2. Rigid wall underlay Rigid wall underlay in association with drained cavities (including direct fixed corrugated profiled metal), are required in extra high wind zones. Refer to Table 3 and Table 23 of E2AS1. Rigid underlays are also required to external walls of attached garages that are unlined. Refer E2AS1 Paragraphs and c). Rigid wall underlay s shall be in accordance with Table 23 of E2AS1, and shall: Be minimum 7 mm H3 plywood, or 6 mm fibre cement sheet Be installed with sheet edges fixed over solid framing Be over-fixed with a flexible wall underlay from Table 23 and installed as in Paragraph of E2AS1 Have flexible underlay folded into opening reveals as in E2AS1 Paragraph Have cavity battens at maximum 400 mm centres Be finish flushed with underside of bottom plate or bearer. 7. Cavity Battens. Cavity battens shall: Be fixed at 400mm centres Be nominal 20 mm (between limits of 18 mm and 25 mm in thickness), Be a minimum 45 mm wide, Be fixed, by the cladding fixings, through the wall underlay into the framing, If timber, comply with B2/AS1, 8. Vermon-Proofing. Vermin-proofing shall be provided above window and door heads and at the base of the drained cavity. Figure 66 of E2AS1 provides one example of an appropriate cavity closer. Aluminium, stainless steel or upvc in accordance with Paragraph 4.1 shall be used where vermin-proofing material is not readily accessible or replaceable. Vermin-proofing shall: Provide holes or slots between 3 mm and 5 mm, Provide an area of opening of 1000 mm2 per lineal metre of wall, and Ph TRICLAD 8

9 Be positioned to allow a minimum drip edge to the wall cladding of: o 10 mm at the base of walls, and o 15 mm above window and door head flashings. 9. Flashings. Acceptable materials for flashing junctions and penetrations are described in Paragraph Selection of flashing materials Selection of flashing materials Flashing materials shall take into account the following factors: The requirements of NZBC Clause B2 Durability, The environment where the building is located, The specific conditions of use, and Consideration of the surrounding materials Environment Flashing materials shall be selected according to the relevant exposure conditions as defined in Table 20 of E2AS1 to minimise corrosion Acceptable Flashing Materials Tables 20, 21 and 22 of E2AS1 shall be used to assess suitability of flashing materials for the required durability Galvanized steel flashings Galvanized steel flashings shall: have a BMT of 0.55 mm minimum be grade G550, or G300 for rolled or crimped flashings be selected for corrosion protection according to the intended exposure zone as shown in Table 20 of E2AS Aluminium-zinc coated steel flashings Aluminium-zinc coated steel flashings shall: have a BMT of 0.55 mm minimum be grade G550, or G300 for curved or crimped flashings be selected for corrosion protection according to the intended exposure zone as shown in Table Stainless steel flashings Stainless steel flashings shall be: Minimum thickness of 0.45 mm, and 304 or 316 stainless steel in accordance with Table 1 of ISO/TS Copper flashings Copper flashings shall be: A minimum thickness of 0.5 mm, In compliance with AS 1566, and Alloy, designation C11000 or C Laps Horizontal laps Laps must be: 32 mm for non-rebated boards, or Ph TRICLAD 9

10 11. Cut Ends All cut ends of Triclad Weatherboard must be coated with Enseal Clear (We also recommend using a high quality primer in conjunction with Enseal Clear ). 12. Sealants All sealants must comply with the NZBC and application is to be done by following the instructions of the Manufacturer instructions. 13. Durability year Durability To meet the requirements for a 30 year minimum durability level, when used as an exterior cladding (as per NZ Building Code Clause B2 for claddings used as bracing or structural element) Triclad Weatherboards must be: H3 preservative treated Coated with a 3 coat acrylic coating system such as a good quality paint or film forming stain system. (Penetrating stains do not meet this requirement) Coating colours must have a light reflectance value (LRV) of 40% or more Minimum total coating system film build of 90 microns Coating must be regularly maintained as part of a normal building maintenance program throughout the life of the building. Advice and assurances from the coating manufacturer must be sought and details submitted for approval with any building consent application to ensure the applicable requirements for 30 year durability are achieved year Durability Coating colours that have a light reflectance value (LRV) of less than 40% or a penetrating stain system have 15 year durability. To meet the requirements for a 15 year minimum durability level, when used as an exterior cladding Triclad Weatherboards must be: H3 preservative treated Coated with a penetrating stain system or Coated with a 3 coat acrylic coating system such as a good quality paint system. Coating must be regularly maintained as part of a normal building maintenance program throughout the life of the building. 14. Coatings Primed Weatherboard PPG 839 Enduraprime is ready for the final coating systems. To ensure best performance from PPG 839 Enduraprime in construction and the prevailing environment after installation, the following painting guidelines are required for finishing LOSP Triclad Weatherboard. External applications (above ground): Ensure that primed timber is free from any dirt, oil or any other surface contaminants. Remove dirt thoroughly by wiping clean. The best performance from PPG 839 Enduraprime is achieved when finishing coats are applied within 8 weeks of installation. If the primer appears or becomes chalky or loose, brush these areas as required and re-prime with a quality primer. Prime any cut ends prior to installation with Enseal Clear (We also recommend using a high quality primer in conjunction with Enseal Clear ) to ensure the product is sealed. When using waterbased acrylic topcoat, apply two coats of a premium brand acrylic topcoat as per label directions. Ph TRICLAD 10

11 When using an oil based topcoat, for optimum performance, firstly apply a good quality undercoat followed by two coats of a premium brand alkyd topcoat as per label directions Stained Weatherboard A quality stain must be used and applied as per manufacturer s directions. 15. Maintenance Routine maintenance is required to meet stated durability and is essential to ensure the performance over the life of the weatherboards. Regular inspection of boards and coatings for weathering and movement, during clean downs is ideal. Special attention required on highly exposed aspects where some face checking*may occur. Inspect all joints, corners, and bottom of walls for debris and clearance for cavity batten drainage holes. Wash down walls regularly to remove contaminants with a recommendation of an annual wash down and application of a slow release mould inhibitor. Repaint as soon as the first sign of deterioration of coating system is identified in accordance with coating manufacturer s specifications. Brush well into face checking*. Ensure dirt, garden soil or leaf build-up is cleared away from the cladding and any sub-floor ventilation with special attention required to maintain air clearance for cavity batten drainage holes. Clean spouting and downpipes as required so that stormwater is not overflowing onto cladding. * Face checking is the result of normal movement of moisture gains and loses often exacerbated by darker colours, and is considered normal it is not limited by the manufacturer s specifications for Triclad Weatherboards. These are superficial and are confined to the face veneer only and do not alter the structural integrity of the plywood. After noting the checking recoat with the appropriate coating system, brushing well into face checks with paint brush. 16. Handling and Storage. Triclad Weatherboards are to be carried in the vertical position and must not be carried on their Flat. Triclad Weatherboards are to be stored on a firm level base with timber supports at not greater than 800mm centres and are to be covered and kept dry until installation. Safety glasses must be worn when cutting Triclad products. When sawing, routing, planing, drilling etc a class P1 or P2 replaceable filter or disposable face piece respirator should be worn. Wear work gloves to avoid skin irritation and the risk of splinters. Wash hands with mild soap and water after handling panels. 17. Drawing Directory Fig 1: Cavity Nailing set out Fig 2: Cavity Framing and Batten setout Fig 3: Cavity Base Detail Concrete floor Fig 4: Cavity Base Detail Timber Floor Fig 5: Cavity External Boxed Corner detail Fig 6: Cavity External Soaker Corner detail Fig 7: Cavity Internal Corner Option 1 Fig 8: Cavity Internal Corner Option 2 Fig 9: Cavity Internal Corner Option 3 Fig 10: Cavity Soffit detail Fig 11: Cavity Soffit/Beam detail Fig 12: Cavity Board Joint detail Fig 13: Cavity Window Head detail Fig 14: Cavity Window Jamb detail Ph TRICLAD 11

12 Fig 15: Fig 16: Fig 17 Fig 18: Fig 19: Fig 20: Cavity Window Sill detail Cavity Meterbox Head detail Cavity Meterbox Jamb detail Cavity Meterbox Sill detail Cavity Penetration detail Cavity - Roof/Wall detail Fig 30: Direct Fix Nailing set out Fig 31: Direct Fix Framing setout Fig 32: Direct Fix Base Detail Concrete floor Fig 33: Direct Fix Base Detail Timber Floor Fig 34: Direct Fix External Boxed Corner detail Fig 35: Direct Fix External Soaker Corner detail Fig 36: Direct Fix Internal Corner - Option 1 Fig 37: Direct Fix Internal Corner - Option 2 Fig 38: Direct Fix Internal Corner - Option 3 Fig 39: Direct Fix Soffit detail Fig 40: Direct Fix Soffit/Beam detail Fig 41: Direct Fix Board Joint detail Fig 42: Direct Fix Window Head detail Fig 43: Direct Fix Window Jamb detail Fig 44: Direct Fix Window Sill detail Fig 45: Direct Fix Meterbox Head detail Fig 46: Direct Fix Meterbox Jamb detail Fig 47: Direct Fix Meterbox Sill detail Fig 48: Direct Fix Penetrations detail Fig 49: Direct Fix Roof/Wall detail Ph TRICLAD 12

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