Abstract
NRCA’s Jan. 1, 2014, Industry Issue Update, “Polyiso’s R-value,” provided an overview of the theory of foam aging; the R-value test method and the long-term thermal resistance (LTTR) methodology; and NRCA’s R-value recommendations associated with the use of polyisocyanurate insulation used in roof systems. This month, NRCA has revised and updated its recommendations applicable to polyisocyanurate insulation. The following supersedes the previous Industry Issue Update and provides an explanation regarding the changes to NRCA’s design in-service R-value recommendations.
NRCA’s Jan. 1, 2014, Industry Issue Update, “Polyiso’s R-value,” provided an overview of the theory of foam aging; the R-value test method and the long-term thermal resistance (LTTR) methodology; and NRCA’s R-value recommendations associated with the use of polyisocyanurate insulation used in roof systems. This month, NRCA has revised and updated its recommendations applicable to polyisocyanurate insulation. The following supersedes the previous Industry Issue Update and provides an explanation regarding the changes to NRCA’s design in-service R-value recommendations.
Date
1/2016
1/2016
Author(s)
Mark Graham
Mark Graham
Page(s)
1-2
1-2
Keyword(s)
R-value; thermal; insulation; methodology
R-value; thermal; insulation; methodology