WEATHERMATE™ SILL SEAL Foam Gasket is a flexible polyethylene foam gasketing strip that can help reduce air infiltration between a concrete foundation and sill plate, around windows and doors - and even between floors. The closed-cell polyethylene foam compresses to seal gaps in irregular surfaces, helping reduce air infiltration for a

Made of polyethylene foam, FoamSealR™ sill plate gasket is durable and moisture resistant, so it will remain intact for years of energy-saving performance. FoamSealR™ is available in convenient rolls in three different widths to fit most standard frame construction. Safety Data Sheets (SDS) Technical Specifications Brand Name: Owens Corning

SILL SEAL Foam Gasket is a flexible polyethylene foam gasketing strip that can help reduce air infiltration between a concrete foundation and sill plate, 

Find 3-1/2-Inch X 50-Foot Yellow Foam Gasket Sill Seal and other TVM products at Sutherlands.

Install a foam gasket beneath sill plates that are sitting on concrete or masonry and adjacent to conditioned space to both air seal and 

Low-density, closed-cell foams such as PVC and ethyl foam take an absolute "compression set." Once compressed, they remain fully, or almost fully, compressed. If a joint opens up over time, the seal is lost. And closed-cell materials can only be compressed about 50 percent before cell walls begin to rupture Read more

Sill Seal Foam is a closed cell, non-cross link, flexible polyethylene foam. It is 1/4 in THK and is available in 3-1/2, 5-1/2 and 7-1/2 in W. Rolls are 100 

The Reflectix® Sill Sealer is a closed-cell product, designed to reduce air leakage between the foundation wall and the sill plate.

Position sill plate and fasten securely to foundation. INSTALLATION INSTRUCTIONS. ICA Sill Seal is a ribbed, non-crosslinked poly- ethylene foam that seals 

STYROFOAM™ SILL SEAL Foam Gasket is a flexible polyethylene foam gasketing strip that can help reduce air infiltration between a concrete foundation and sill plate, around windows and doors - and even between floors. The closed-cell polyethylene foam compresses to seal gaps in

One of which is a "back yard" test on the foam vs the EPDM gasket. While the back yard testing is not totally applicable as most sill seals are not exposed to UV and it doesn't really address sealing it is a side by side look at the materials. https://www.justneedspaint.com/house-gasket-durability/