Tony Mainsbridge
2/13/2009
I am a builder and volunteer with Habitat For Humanity. Habitat is about to build a LEED Certified home using Advanced Framing and dedicated focus on Energy Efficiency. An Architect has suggested that the Classic Rib Metal Roofing should be installed on battens over moisture barrier on roof decking - to fascilitate a Radiant Barrier. We normally fasten down to 5/8" CDX Plywood roof decking only(with moisture barrier of course). Our roof pitch is 4.5/12. To reduce lumber use and size of drip edge we would like to install on 1x4 #2 S.Y.P. battens at 24"oc - sloped diagonally across the roof to provide excellent drainage of condesation - over moisture barrier on 7/16" OSB roof decking. This would be the ultimate "Green" metal roof, with minimal lumber to acheive the energy efficiency of the radiant barrier. The only batten installation instructions I have found spec 2x4 battens - and our Engineer will only certify based upon manufacturer installation instructions since we must meet a 140mph design wind velocity. I would think the combination of 1x4 battens and 7/16" OSB roof decking, with fasteners long enough to penetrate both (1-1/2" minimum?)should meet deadload support and uplift/withdrawl resistence requirements. Can you direct me to any manufacturers installation instructions that detail this type of innstall?
Todd Miller
Isaiah Industries, Inc.
2/21/2009
You will need to get the installation instructions specifc to the product you choose. Manufacturer load tables which specify fastening requirements and spacing are based upon actual test results which are affected by the exact panel, the metal and gauge, etc
Guest User
2/21/2009
Thats why I asked the question: "Can you direct me to any manufacturers installation instructions that detail this type of install?" I was not seeking opinions on whether anyone thinks this might be a good idea - the logic of such installation is both sound and proven. Green Building is not acheived when 2x4 is used where 1x4 is sufficient, or when 5/8" CDX Plywood is used where 7/16" OSB is sufficient.
Todd Miller
Isaiah Industries, Inc.
2/22/2009
Fabral and Metal Sales Manufacturing both have manuals posted on their websites.
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