October 2006

Specifying polyiso | Tech Today

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Specifying polyiso

by Mark S. Graham
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Polyisocyanurate insulation widely is used in low-slope roof systems and sometimes as a component of steep-slope roof assemblies. Specifying the correct type of polyisocyanurate insulation for a specific application is an important design consideration for ensuring long-term roof system performance.

Following are descriptions of various types of polyisocyanurate insulation products.

ASTM C1289

The current recognized U.S. product standard for faced polyisocyanurate insulation is ASTM C1289-06, "Standard Specification for Faced Rigid Cellular Polyisocyanurate Thermal Insulation Board." Within this standard, there are six type classifications, several of which are further divided into classes. And three classes are further subdivided into grades. Overall, the standard...

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