Reliable Foundations Q&A

Polylevel has been installed across the United States since 2008. It does not break down or have a sponge affect. It's closed cell, waterproof, and heat resistant so it does not shrink. This product is also designed to compress compromised soils and, it comes with a warranty, guaranteeing the quality of this product. 

Polylevel foam will last as long as the concrete on top of it does. The only thing that can break the foam down is UV light, which, under solid concrete cannot reach the Polylevel foam.