Revising LTTR

Abstract
Faced rigid board polyisocyanurate insulation is the most popular type of insulation used in low-slope roof systems in the U.S. However, after years of debate, there still is no industry-wide consensus of an appropriate R-value for design purposes.

Date
4/2013

Author(s)
Mark Graham

Page(s)
12

Source
Professional Roofing / National Roofing Contractors Assn

Keyword(s)
LTTR; polyisocyanurate; insulation; r-value; PIMA

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