Foam Sill Sealer Insulation 6" x 200'

Engineered to create a continuous, weatherproof barrier between your foundation’s sill plates and the subfloor framing, this 6″ x 200′ roll of closed-cell foam excels at reducing air infiltration, moisture intrusion, and energy loss. Its flexible, compressible design conforms to uneven surfaces and maintains a consistent seal over time, helping to keep interior spaces comfortable and protected from drafts, pests, and mildew.

Ideal for new construction or retrofit projects, this sill sealer is quick to install—simply unroll and compress into place. It’s compatible with a variety of building materials and meets common code requirements for rim-joist gasketing, crawl space sealing, and under-plate insulation.

Key Features

• Provides an airtight, moisture-resistant seal between sill plates and foundations
• Closed-cell foam resists mold, mildew, and insect infiltration
• Flexibility accommodates uneven surfaces and minor imperfections
• Durable material maintains compression set over decades
• Easy, tool-free installation—no adhesives or fasteners required