Polyiso is a closed-cell, rigid foam board insulation that typically comes in 1”, 2”, and 4” thickness. THERMAX™ and Dow “blue board” are the two most common types of polyiso insulation.

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The crawl space under my 1910 home is just exposed dirt and leftover building materials. I need to add a vapor barrier and wonder about the best one. The foundation consists of granite slabs and ...

DEAR TIM: The crawl space under my 1910 home is just exposed dirt and leftover building materials. I need to add a vapor barrier and wonder about the best one. The foundation consists of granite ...

Krieger says there are three types of insulation commonly used in crawl spaces – polyiso, spray foam, and fiberglass. Polyiso is a closed-cell, rigid foam board insulation that typically comes ...