Polyisocynaurate insulation is one of the more commonly used insulation types in the roofing industry. Most manufacturers of polyisocyanurate insulation use the long-term thermal resistance (LTTR) method of determination. LTTR method is defined by ASTM C1303, “Standard Test Method for Predicting Long-Term Thermal Resistance of Closed-Cell Foam Insulation.”
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[source: http://www.buildings.com/ArticleDetails/tabid/3334/ArticleID/14389/Default.aspx]
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