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Revised R-values

Abstract
NRCA has revised its longstanding design R-value recommendations for polyisocyanurate insulation.
Date
12/2010
Author(s)
Mark Graham
Page(s)
20
Source
Professional Roofing / National Roofing Contractors Assn
Keyword(s)
r-value recommendations; polyisocyanurate insulation; polyiso

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