Closed-cell polyethylene foam gasket that seals the gap between the concrete foundation and the wood sill plate. Foundations are never perfectly flat and sill plates are rarely perfectly straight - the resulting gap is one of the largest single air-leak paths in a typical residential envelope. ShelterSeal compresses to fill the gap, blocks the air infiltration path, blocks capillary moisture wicking from concrete to wood, and discourages insects from finding a ready entry route. Width sized to match the bottom width of standard dimensional lumber sill plates.

• Width: 5-1/2" (matches the bottom width of nominal 2x6 sill plates)
• Length: 50 Ft per roll
• Material: Closed-cell polyethylene foam (does not absorb water or compost)
• Color: Foam tan / off-white
• Seals foundation-to-sill plate gap against air infiltration and moisture wicking
• Discourages insect entry through the foundation-to-sill gap
• Permanent service life - polyethylene does not break down under sustained compression or moisture exposure
• Also for use under door thresholds, around window frames, and at top-plate-to-double-top-plate joints in air-sealed construction

Tip: The 5-1/2" width is the right pick for nominal 2x6 sill plates, which are common in modern code-built 2x6 stud walls and in light commercial and post-frame construction. Roll out the gasket along the top of the foundation, drop the sill plate on top, and anchor down with sill anchor bolts - the foam compresses to fill irregularities up to roughly 1/2". Use one continuous roll where possible; butt-join roll ends rather than overlapping. For 2x4 sill plates choose the 3-1/2" wide ShelterSeal version instead.

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