moisture barrier
Registered User
Joined: May 2009
Posts: 1,614
From: S.E. Louisiana, so far still in U.S.A.
I once used some "stuff" called Roof Top Guard. It's an underlayment, probably intended for metal roofs. It's about 0.007" thick, very flexible, and very tough. You can't tear it; it must be cut. Made in Finland by Rosenlew RKW Ltd. Marketed in USA by Classic Products, Inc., Piqua, OH. (But not widely available in my area.) 
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