Guest User
Another question about metal roof. I need to put down a layer of 1/2" plywood or osb for my metal roof. Somehow, I got the impression that plywood is "better". The metal roof store person told me that osb is better than (or at least as good as) plywood, and it costs less. He suggested one kind of osb that has a metal layer (do not know the name) on one side. When you install the osb, facing the metal towards the attic. This kind of osb is still cheaper than plywood. But I also read that some people question the "metal-faced" osb (its effectiveness of reflecting heat and trapping moisture, etc). I seems more trusting what you say here. What would be your recommendation for a metal roof. plywood, regular osb, or the osb with a metal layer on one side? PS. The store is not trying to sell me something; they carry plywood as well.
Todd Miller
Isaiah Industries, Inc.
In my opinion, there is greater consistency as far as ability to hold fasteners well with CDX plywood than with OSB. Also, as long as you're using a metal roof with reflective pigment in the coating, I do not feel there is any major benefit from the decking that includes a radiant barrier.
Eric Novotny
An informed customer is the Best Customer!
+1 We also prefer CDX over OSB. While the uniform load deflections say that OSB is just as good, the CDX is much more fastener and nail friendly.
john J
Thank you both!

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