ISO Board | Ask The Experts Forum | Metal Roofing Alliance

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My contractor says he can only put 1 1/2 inch of ISO b/c of "clamp" down issues associated with screwing the mental roof down and causing valley's at the screw point. What are some "usual" insulation methods to get a higher R value?	Guest User 12/5/2008	Share Or copy this URL: https://www.metalroofing.com/spirit/comment/12405/find/
The best method and what we usually do is to put 1/2 inch OSB over the ISO board. That will sandwich your ISO board between two solid substrates. We have done it up to 4" and it works great. [email protected]	Guest User 12/6/2008	Share Or copy this URL: https://www.metalroofing.com/spirit/comment/12406/find/
Thanks Wade. That is good advice.	Todd Miller Isaiah Industries, Inc. 12/6/2008	Share Or copy this URL: https://www.metalroofing.com/spirit/comment/12407/find/
I was informed a 5/8" substrate was required for a screw application. Is 1/2" thick enough?	Guest User 12/14/2008	Share Or copy this URL: https://www.metalroofing.com/spirit/comment/12408/find/