Can PU Foam Board be used in below-grade applications?

Yes, but with important considerations. High-density, closed-cell PU boards with appropriate facers (typically glass fiber reinforced) are suitable for foundation walls and below-grade applications. They provide excellent thermal performance and moisture resistance. However, proper waterproofing membranes and protection boards are essential. The insulation should be rated for constant ground contact and resistant to soil chemicals and hydrostatic pressure. Manufacturer specifications for below-grade use must be strictly followed.

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Can PU Foam Board be used in below-grade applications?

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