82253 Underlay No underlay is required 82254 Material The following shall apply

82253 underlay no underlay is required 82254 material

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8.2.2.5.3 Underlay No underlay is required. 8.2.2.5.4 Material The following shall apply: a) metal roof shingle roof coverings of galvanised steel shall be 0.40 mm minimum thickness; and b) metal roof shingle roof coverings of aluminium shall be of 0.60 mm minimum thickness. Material Minimum thickness Weight/m² Copper 5 kg/m 2 Aluminium 0.60 mm Stainless steel 0.40 mm Galvanised steel 0.63 mm Zinc alloy 0.70 mm Lead 12 kg/m 2
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PCTTS 599: 20XX 154 8.2.2.5.5 Application Metal roof shingles shall be secured to the roof in accordance with the manufacturer's installation instructions. 8.2.2.5.6 Flashing Valley flashing shall be of corrosion-resistant metal with a minimum thickness of 0.40 mm. It shall extend at least 200 mm from the centreline each way and shall have a splash diverter rib not less than 20 mm high at the flow line formed as part of the flashing. Sections of flashing shall have an end lap of not less than 100 mm. The metal valley flashing shall have a 900 mm wide underlay directly under it consisting of one layer of underlay running the full length of the valley, in addition to underlay required for metal roof shingles. 8.2.2.6 Slate shingles 8.2.2.6.1 Deck requirements Slate shingles shall be fastened to solidly sheathed roofs. 8.2.2.6.2 Deck slope Slate shingles shall only be used on slopes of 50% (26°) or greater. 8.2.2.6.3 Underlay Underlay is not required. 8.2.2.6.4 Material Slate shingles shall comply with ASTM C406. 8.2.2.6.5 Application Minimum head-lap for slate shingles shall be in accordance with the Table 8-11. Slate shingles shall be secured to the roof with two fasteners per slate. Slate shingles shall be installed in accordance with the manufacturer's installation instructions. 8.2.2.6.6 Flashing Flashing and counter-flashing shall be made of sheet metal. Valley flashing shall have a minimum width of 400 mm. Valley and flashing metal shall be have a minimum uncoated thickness of 0.50 mm. 8.2.2.7 Clay and concrete tile 8.2.2.7.1 Deck requirements Concrete and clay tile shall be installed only over solid sheathing or spaced structural sheathing boards.
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PCTTS 599: 20XX 155 Table 8-11 Slate shingle head-lap Slope Head-lap 50% (26°) < slope < 70% (35°) 100 mm 70% (35°) < slope < 173% (60°) 75 mm Slope < 173% (60°) 50 mm 8.2.2.7.2 Deck slope Clay and concrete roof tile shall be installed on roof slopes of 25% (15°) or greater. For roof slope 25% ( 15° ) to 35% (20°), double underlay application is required. 8.2.2.7.3 Underlay 8.2.2.7.3.1 Material Unless otherwise noted, required underlay shall conform to: ASTM D226 (Type 11), ASTM D2626 (Type I) or ASTM D249 . 8.2.2.7.3.2 Low slope roofs For roof slopes from 25% (15°), up to 35% (20°), un derlay shall be a minimum of two layers applied as follows: a) apply a 450 mm strip of underlay felt parallel with and starting at the eaves fastened sufficiently in place; end laps shall be offset by 1.80 m; and b) starting at the eaves, apply 900 mm wide sheets of underlay felt overlapping successive sheets 450 mm and fastened sufficiently in place.
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