Minimum pitch for corrugated panels: "BHP Steel in Australia specifies a minimum pitch of 1:12 ..." - Eric Brown (9/2/2003) | Roof Pitch | Archive

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BHP Steel in Australia specifies a minimum pitch of 1:12 for corrugated Zincalume panel roofs. I thought the min. rated pitch was more like 3:12. Do you know if this is because Australia has less stringent requirements or if they use a different method of installation? Also, is it better to install fasteners at the top of the corrugation than the bottom for waterproofness? Thanks, Eric		Eric Brown 9/2/2003	Share Or copy this URL: https://www.metalroofing.com/spirit/comment/2238/find/
Minimum pitch is specified by individual manufacturers based upon each product's performance characteristics and testing. Under absolutely no circumstances should a product be installed at a lower pitch than its minimum specified pitch. I am not familiar enough with the Aussie BHP panels to say why their minimum pitch is lower though I will say that most of the Aussie panels have a fairly high rib configuration and that would be a factor. Most US manufacturers want the fasteners in the top of the crimps.		Todd Miller Isaiah Industries, Inc. 9/2/2003	Share Or copy this URL: https://www.metalroofing.com/spirit/comment/2239/find/