82244 Material Unless otherwise noted required underlay shall conform to ASTM

82244 material unless otherwise noted required

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8.2.2.4.4 Material Unless otherwise noted, required underlay shall conform to ASTM D226, Type 1, or ASTM D 4869, Type 1. Asphalt shingles shall have self-seal strips or be interlocking, and comply with ASTM D225 or ASTM D3462. 8.2.2.4.5 Fasteners Asphalt shingles shall be fixed to the decking using the proper adhesives in accordance with the manufacturer’s instructions. Galvanised extra large head clout nails may also be used for fastening asphalt shingles. When using corrosion-resistant nails the minimum shall be 3.5 mm x 10 mm head, and when using corrosion-resistant staples the minimum shall be 2 mm x 24 mm crown width. Fasteners shall be long enough to penetrate 20 mm into the sheathing or through the thickness of the sheathing, whichever is less. Asphalt shingles shall be installed with the type and minimum number of fasteners required by the manufacturer. For normal applications, asphalt shingles shall be secured to the roof with not less than four fasteners per strip shingle or two fasteners per individual shingle. Where the roof slope exceeds 166% (60°), special methods of fastening are required. 8.2.2.4.6 Flashing 8.2.2.4.6.1 Base and cap flashing for asphalt shingles shall be installed in accordance with manufacturer's installation instructions and shall meet the following requirements: a) base flashing shall be of either corrosion-resistant metal with a minimum nominal thickness of 0.50 mm, or mineral surface roll roofing with a minimum weight of 3.75 kg/m; and b) cap flashing shall be corrosion -resistant metal with a minimum nominal thickness of 0.50 mm.
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PCTTS 599: 20XX 153 8.2.2.4.6.2 Valley linings shall be installed in accordance with manufacturer's installation instructions before applying shingles. Valley linings of the following types shall be permitted: a) for open valleys (valley lining exposed) lined with metal - the valley lining shall be of any of the corrosion-resistant metals and at least 600 mm wide and; b) for open valleys - valley lining of two plies of mineral surface roll roofing shall be installed; the bottom layer shall be 450 mm and the top layers a minimum of 900 mm wide; and c) for closed valleys (valley covered with shingles) - valley lining of one ply of smooth roll roofing at least 900 mm wide or valley lining as described in a) and b) above. See Table 8-10 for the minimum requirements of valley lining materials. Speciality underlay complying with ASTM D 1970 may be used in lieu of the lining material. Table 8-10 Valley lining material 8.2.2.5 Metal roof shingles 8.2.2.5.1 Deck requirements Metal roof shingles shall be applied to a solid or closely fitted deck, except where the roof covering is specifically designed to be applied to spaced sheathing. 8.2.2.5.2 Deck slope Metal roof shingles shall not be installed on roof slopes less than 17% (10°).
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