Spray foam under a concrete slab is the best way to insulate the floor and it also eliminates any radon that may have otherwise seeped in from the... | By Empire Insulation
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Below-Grade Under Slab system with FOAMULAR® rigid board insulation. - Owens Corning® Enclosure Solutions
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SilveRboard R10 High Density 35 PSI Under Slab Insulation Kit - (10 Sheets) 2 in. x 2 ft. x 4 ft. - 80 sq. ft. SB35S200424KIT - The Home Depot
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