NOTE Aluminium sheeting is not recommended unless 060 mm 22G sheeting is

Note aluminium sheeting is not recommended unless 060

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NOTE Aluminium sheeting is not recommended unless 0.60 mm (22G) sheeting is available and unless the fixings supplied have been tested to withstand hurricane force winds. 8.2.2.2.2 Fastening Steel sheeting shall be fastened to battens, purlins or sheathing using galvanised screws that are at least 50 mm long. Galvanised head twisted shank nails are not adequate. Where corrugated sheeting is used, the screws shall be driven through the crown of the corrugation. The minimum fastening density of screws shall be as follows: (a) roof edges, eaves, and ridges: 1 screw every 250 mm; and (b) other areas: 3 screws per square metre. 8.2.2.3 Metal roof panels 8.2.2.3.1 Deck requirements Metal roof panel coverings shall be applied to a continuous or spaced sheathing, except where the roof covering is specifically designed to be applied to spaced supports.
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PCTTS 599: 20XX 151 8.2.2.3.2 Slope The minimum slope for metal roof panel systems shall be: (a) 25% (14°) for lapped, non-soldered seam metal roof system; and (b) 17% (10°) for standing seam roof systems. 8.2.2.3.3 Material Metal sheet roof coverings installed over structural decking shall comply with Table 8-9. Table 8-9 Metal roof coverings Roof covering type Applicable standard Rate / thickness Galvanised steel TTS 69: 2004 Pre-painted steel ASTM A755 Aluminium-zinc alloy coated steel TTS 69: 2004 Lead-coated copper ASTM B101 Copper 4.9 kg/m 2 Aluminium 0.60mm minimum thickness 8.2.2.3.4 Attachment Appropriate fasteners shall attach metal roofing fastened directly to steel framing. The following fasteners shall be used: a) galvanised fasteners shall be used for galvanised roofs; b) hard copper or copper alloy shall be used for copper roofs; and c) stainless steel fasteners for other metal roofs. 8.2.2.4 Asphalt shingles 8.2.2.4.1 Deck requirements Asphalt shingles shall be fastened to solidly sheathed decks. 8.2.2.4.2 Slope Asphalt shingles shall only be used on roof slopes of 17% (10°) or greater.
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PCTTS 599: 20XX 152 8.2.2.4.3 Underlay 8.2.2.4.3.1 For roof slopes from 17% (10°), up to 35% (20°), underlay shall be two layers applied in the following manner: A 480 mm strip of underlay felt shall be applied parallel with and starting at the eaves and fastened sufficiently to hold in place. Starting at the eaves, 900 mm wide sheets of underlay shall be applied with 480 mm overlap on successive sheets and fastened sufficiently to hold in place. 8.2.2.4.3.2 For roof slopes greater than 35% (20°), underlay shall be one layer applied in the following manner: Underlay shall be applied shingle fashion, parallel to and starting from the eaves, lapped 50 mm and fastened sufficiently to hold in place. End laps shall be offset by 1.80 m. Underlay applied in areas subject to high winds (greater than 145 km/hr) shall be applied with corrosion-resistant nails in accordance with manufacturer's installation instructions. Fasteners are to be applied along the overlap at a maximum of 900 mm on centre.
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