Beyond thermal performance, Owens Corning's 3-1/2 in. x 50 ft. Polyethylene Foam Sill Sealer sill sealer also acts as a moisture and pest barrier. The closed-cell structure of the polyethylene foam resists the movement of moisture from the foundation into the wooden framing, which can help prevent mold and wood rot over time. Its structure also helps deter insects from penetrating the sill area, offering an added layer of protection. Simple to install and built for long-term performance, it supports both energy savings and structural integrity.
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