Bostik Expanda Foam Polyurethane Expanding Foam 650ml Aerosol

Bostik Expanda Foam® is a one-component, moisture-curing polyurethane foam built to seal, fill, bond, and insulate in one step. It expands to fill gaps and cavities of almost any size, then cures to an airtight, moisture-resistant seal that won't shrink or crack away from the surrounding surface over time. A straw applicator comes with every can, so it's easy to direct the foam into awkward spots and apply it at any angle. It's suited to jobs like sealing openings around roof construction, filling wall and floor cavities, and adding a sound-absorbing or acoustic baffle layer, so it works equally well for insulation and for quieting a noisy space. Builders, carpenters, and facilities maintenance teams reach for it because it holds its shape and seal reliably, whether the job is indoors or outside.