Thermakraft FIRE RETARDANT SELF SUPPORTING ABSORBENT BREATHABLE SYNTHETIC NON-WOVEN ROOF UNDERLAY STRENGTH BREATHER SHEET WATER RESISTANCE

Transcription

1 CI/SfB MAY 2012 MEMBRANES OF THE FUTURE FIRE RETARDANT SELF SUPPORTING ABSORBENT BREATHABLE SYNTHETIC NON-WOVEN ROOF UNDERLAY STRENGTH BREATHER SHEET WATER RESISTANCE FLAMMABILITY < FLAMMABILITY INDEX OF 5 AS1530 PART 2 BRANZ Appraised Appraisal No. 651 [ 2009] Thermakraft

2 FIRE RETARDANT SELF SUPPORTING ABSORBENT BREATHABLE SYNTHETIC NON-WOVEN ROOF UNDERLAY APPLICATION AND INSTALLATION Product Description without impending the passage of water vapour. is a five layer polymer structure that is designed to prevent water penetration consists of a microporous water resistant film, sandwiched between two layers of mould and shrink resistant spun-bonded polyolefin. is manufactured with an upper layer of tear resistant synthetic spun-bond, and a lower layer of tear resistant synthetic spun-bond facing down. Both layers are designed to protect the inner water resistant microporous membrane. Flammability < has a flammability index 5 and therefore meets the requirements of NZBC Acceptable Solutions C/AS1 Part 6 Table 6.2 for surface finish requirements for suspended flexible fabric, and therefore it may be used without restrictions in all buildings. Product Advantages is a unique five layer membrane with these important features: can be used in direct fix or cavity fix for roof and wall construction is more stable and more shrink resistant than kraft based products may be installed during adverse conditions (rain) without affecting its durability and performance will not increase risk of condensation as compared with comparable kraft underlays has an edge tear greater than 300N has a 150mm lap line printed on each edge. Application LONG-RUN METAL ROOFING / VERTICAL OR HORIZONTAL INSTALLATION METHOD can be direct fix or cavity fix and must be installed in a manner that prevents ponding of water, and span no more than 1200mm. can be laid vertically or horizontally on roof slopes of 10 degrees or more without support. ILLUSTRATION FOR CORRUGATED ROOFING 150mm Lap Line run horizontally

3 APPLICATION AND INSTALLATION... contd LONG-RUN METAL ROOFING... contd Fix using stainless steel 8-12mm staples or 20mm flat head clouts, or appropriate proprietary fastenings. o o Between 3 and 5 pitched roofs, Therma kraft recommends supporting on Therma kraft Safety Mesh 300mm x 150m, or hexagonal netting 50mm or 75mm, and or Therma kraft Arctic White Thermastrap 203, or Thermastrap 201. Fix horizontally at 300mm centres. If required to achieve a lap seal (refer to NZ Metal Roofing Code of Practice and 4.3.9), use Therma kraft Window Sealing Tape. B ALU AND required may be unwound to the full length from the gutter to the ridge. However, when ridge ventilation is must be terminated at the ridge purlin to allow a free passage of air. Flue penetrations must have a minimum distance of 50mm from the Wall Cladding Code of Practice 4.3.8). (refer to NZ Metal Roof and must be free of tears and punctures, fit tightly and be lap taped around all penetrations (except flue penetrations), to provide drainage for any condensation, or surface water from leaks. NOTE: Do not use ALU BAND on penetrations where Polybutene water pipes have been installed. Refer Pipe Manufacturers for instructions on sealing penetrations. NOTE: Commercial Buildings may require the use of Thermakraft Safety Mesh under. can be installed above the battens or purlins for profiled metal roof claddings and otherwise in accordance with NZBC E2/AS1. LONG-RUN METAL ROOFING Wooden Construction Profile Roofing LONG-RUN METAL ROOFING Steel Construction Thermakraft Safety Mesh Fastenings as per Roofing Manufacturer Rafter or Truss Purlin Max 25mm drape 150mm Lap Lines Horizontal Fix the outer face. upper sheet lapped over lower sheets (shiplap) to ensure water is shed to NOTE: can move downwards. To prevent this it must be Captured by the fastenings at each purlin. Horizontal fix must not be used on purlin distance greater than 1100mm to allow for 150mm laps.

4 APPLICATION AND INSTALLATION... contd Tile Roofs CONCRETE / METAL TILE ROOFING must be laid over rafters prior to fixing the tile battens. The maximum span between rafters for is 1200mm. Masonry tile roofs with pitches less than 17 degrees must have antiponding boards in accordance with E2/AS1 Paragraph Installed may be laid over the top of the antiponding boards and draped into the gutter by no more than 25mm. Antiponding boards must be treated in accordance with NZS NOTE: Where overlap occurs under Tile Battens, minimum overlap may be reduced to 75mm. CONCRETE / METAL TILE ROOFING Concrete / Pressed Steel Tile 150mm Lap Line Batten Rafter / Truss Rafter Max 25mm drape Anti-ponding board laid horizontal over Rafters ILLUSTRATION FOR TILE ROOFING METAL TILE INSTALLATION Fastening as per roof manufacturers recommendation Underlay B ALU AND For more information regarding Therma kraft Window Sealing System (BRANZ No.614 [2008]) refer to the APPLICATION and INSTALLATION GUIDELINES or contact Thermakraft Customer Services on

5 FIRE RETARDANT SELF SUPPORTING ABSORBENT BREATHABLE SYNTHETIC NON-WOVEN ROOF UNDERLAY TECHNICAL SPECIFICATIONS FIRE RETARDANT SELF SUPPORTING ABSORBENT BREATHABLE SYNTHETIC NON-WOVEN ROOF UNDERLAY can be used as a roof underlay on buildings within the following scope: the scope limitations of NZBC Acceptable Solution E2/AS1, Paragraph 1.1 with regards to building height and floor plan area; and, with masonry tile roof cladding; and, with metal tile and profiled metal roof cladding; and, situated in NZS 3604 Building Wind Zones up to, and including Very High. Product Specifications installation must always be carried out in accordance with: Therma kraft Application and Installation Guidelines Installed by or under the direct supervision of a licensed Building Practitioner or qualified Roofer NZBC Acceptable Solution E2/AS1 Paragraph NZ Metal Roofing Manufacturers Roof and Wall Cladding - Code of Practice Metal Roof / Tile Manufacturers specifications must not be left exposed to direct sunlight or UV light sources during its serviceable life; must not be left exposed to the elements on the roof for more than 7 days before being covered; The design application and installation of must follow sound condensation management principles, making use of ventilation and vapour control layers where necessary. Durability Requirements will meet the Performance Requirements of NZBC: Clauses B2 Durability B2.3.1 (a) not less than 50 years, B2.3.1 (b) 15 years and B2.3.2 Clause C Part 6 Table 6.2: Flammability Index < 5 Clause E2 External Moisture: Performance E2.3.2 when used as part of the Roof Cladding System Clause F2 Hazardous Building Materials: Performance F2.3.1 will not present a health hazard to people. TABLE 1: NZBC E2/AS1 ALTERNATIVE SOLUTION TO TABLE 23 AS A ROOFING UNDERLAY REQUIREMENT NZBC E2/AS1 TABLE 23 ROOF UNDERLAY PROPERTIES PROPERTY PERFORMANCE REQUIREMENT ACTUAL PROPERTY PERFORMANCE Absorbency Vapour Resistance ph of Extract Shrinkage Water Resistance >150 g/m 2 <7 MN.s/g > 6 and < 9 <0.5% >100mm >150 g/m 2 Storage should be stood on end in dry conditions. Protect from the weather and direct sunlight. Roll Dimensions mm x 40.0m = 50m 1250mm x 20.0m = 25m

6 FIRE RETARDANT SELF SUPPORTING ABSORBENT BREATHABLE SYNTHETIC NON-WOVEN ROOF UNDERLAY TECHNICAL SPECIFICATIONS Control Of Condensation In climatic regions where condensation risks are high, such as cold or high humidity areas, care needs to be taken in specifying the correct design and installation to prevent moisture build-up in the roof cavities. Factors which adversely affect the condensation risk in roofing systems include; Humid, and/or cold climatic regions Warm/Skillion roof construction Low roof cavity air volume and restricted air movement Omitting Vapour Control Layers Ceiling penetrations and entry of warm air into roof cavities Occupancy activities which have high moisture loading on conditioned spaces Low pitched roof Bulk insulation Building structures ability to naturally dry Construction Moisture Skillion and Warm Roof Construction are particularly sensitive to moisture accumulation and the design and installation of roof construction needs to take into account the higher condensation risks. Refer MRM Code of Practice for details. The recommendations contained in Therma kraft s literature are based on good building practice, but are not an exhaustive statement of all relevant information and are subject to any conditions contained in the Warranty. All product dimensions and performance claims are subject to any variation caused by normal manufacturing process and tolerances. Furthermore, as the successful performance of the relevant system depends on numerous factors outside the control of Therma kraft (for example quality of workmanship and design), Therma kraft shall not be liable for the recommendations in that literature and the performance of the Product, including its suitability for any purpose or ability to satisfy the relevant provisions of the Building Code, regulations and standards. Thermakraft Industries (NZ) Ltd 11 Turin Place, East Tamaki, Auckland, New Zealand PO Box , Botany, Manukau 2163, New Zealand Phone: Fax: Free Phone: sales@thermakraft.co.nz Website: