Longspan also known as Spandeck is a long spanning, high strength roof and wall sheet. Longspan has a popular square-corrugated style residential roofing profile, it is suitable for pitched roofs (3° or more) with a conventional pierce-fixing with only four fasteners per sheet maximises performance and speeds up installation.
The sheeting shall be fixed to the purlins/girts in accordance with the manufacturer’s recommendations. Suitable fixing screws in accordance with Australian Standard AS3566, Class 3, shall be used at every support with side lap fasteners installed at mid span if required. Sheets shall be laid in such a manner that the approved side lap faces away from the prevailing weather.
A minimum of 50mm shall be provided for projection into gutters. Flashings shall be supplied in compatible materials as specified; minimum cover of flashing shall be 150mm. All sheeting shall be fixed in a workman-like manner, leaving the job clean and weathertight. Repair minor blemishes with touch-up paint supplied by the sheeting manufacturer. All debris (nuts, screws, cuttings, filings etc.) shall be cleaned off daily.
Class 4 fasteners should be used <1km from the coast.
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