Guest User
i am building a porch (24 x 16) onto my house and am using metal roofing.should i use plywood or osb underlayment.what thickness?
Todd Miller
Isaiah Industries, Inc.
Always check and see what the roofing manufacturer approves as a substrate. However, that said, I believe most companies have tested their products on plywood but will tell you OSB is okay. Due to possible moisture and condensation issues in a cabin, I would tend toward plywood and, of urse, an appropriate underlaymeenton top of that. Good attic ventilation is a good idea.
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