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TOPIC: Insulation Concerns

ISO Board

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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
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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
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Thanks Wade. That is good advice. Todd Miller
Todd Miller
Isaiah Industries, Inc.

12/6/2008
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I was informed a 5/8" substrate was required for a screw application. Is 1/2" thick enough?
Guest User

12/14/2008
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