Are you getting what the R-value specified and paid for?

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/Article-Details/ArticleID/14389/title/are-you-getting-what-the-rvalue-specified-and-paid-for.aspx]


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