822733 High slope roofs For roof slopes greater underlay shall be a

822733 high slope roofs for roof slopes greater

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8.2.2.7.3.3 High slope roofs For roof slopes greater than 35% (20°), underlay shall be a minimum of one layer of underlay felt applied shingle fashion, parallel to, and starting from the eaves, lapped 50 mm and fastened sufficiently in place. 8.2.2.7.4 Material Clay roof tile shall comply with ASTM C 1167. Concrete roof tile shall comply with BS EN 490. 8.2.2.7.5 Fasteners Nails shall be corrosion -resistant and not less than 3.5 mm with 8 mm head, and of sufficient length to penetrate the deck a minimum of 20 mm or through the thickness of the deck, whichever is less. Attaching wire for clay or concrete tile shall not be smaller than 2 mm. Perimeter fastening areas include three tile courses but not less than 900 mm from either side of hips or ridges and edges of eaves and gable rakes.
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PCTTS 599: 20XX 156 8.2.2.7.6 Application Tile shall be applied in accordance with the manufacturer's installation instructions, based on the following: a) roof slope; b) underlay system; and c) type of tile being installed Clay and concrete roof tiles shall be fastened in accordance Table 8-12 and the manufacturer's installation instructions. Perimeter tiles shall be fastened with a minimum of one fastener per tile. 8.2.2.7.7 Flashing At the juncture of the roof vertical surfaces, flashing and counter flashing shall be provided in accordance with this clause and the manufacturer's installation instructions. Where the flashing is of metal it shall be of corrosion resistant metal with a minimum thickness of 0.50 mm. The valley flashing shall extend at least 300 mm from the centreline each way and have a splash diverter rib not less than 25 mm high at the flow line formed as part of the flashing. Sections of flashing shall have an end l ap of not less than 100 mm. For roof slopes of 25% (15°) and over, the valley flashing shall have a 900 mm wide underlay of one layer of Type I underlay running the full length of the valley, in addition to other required underlay. Table 8-12 Clay and concrete tile attachment Sheathing Roof slope Number of fasteners Solid without battens All One per tile 40% (22°)< slope <100% (45°) One per tile or every other row Spaced sheathing without battens 100% (45°)< slope < 200% (64°) One per tile
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