Is PET Foam suitable for below-grade or exterior insulation applications?

Yes, but with specific considerations. Its excellent moisture resistance and compressive strength make it technically suitable for protected exterior applications like rainscreen cavities and roofs. For below-grade use (foundation walls), it is less common than XPS. While it resists water, manufacturers’ guidance must be followed explicitly, and it often requires specific protective coatings or drainage mats in below-grade environments to ensure long-term durability against soil chemicals and constant moisture exposure.

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Is PET Foam suitable for below-grade or exterior insulation applications?

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