BOSS 334 Door & Window Foam is a high-performance, single-component polyurethane foam designed for use with foam applicator guns. This gun-grade formula provides consistent, controlled bead placement and expansion, making it ideal for sealing around door frames, window installations, rough openings, and general construction gaps.

Powered with a CFC-free propellant, this foam is environmentally responsible while delivering excellent adhesion to wood, masonry, concrete, metals, and most common building substrates. BOSS 334 expands to fill voids, reduces air leakage, and improves energy efficiency, all while remaining flexible enough for door and window applications where movement can occur.

Its gun-dispensed design allows contractors to apply foam with precision, reduce waste, and achieve professional-quality results on every job. With strong insulating properties and dependable curing performance, BOSS 334 is a reliable choice for residential and commercial construction projects.

FEATURES & BENEFITS

• One-component polyurethane foam for gun applicators

• Designed for sealing doors, windows, and framing gaps

• Controlled bead dispensing for precise application

• CFC-free propellant, ozone-safe

• Excellent adhesion to most building materials

• Self-expanding formula for strong insulation and air sealing

• Ideal for residential, commercial, and remodeling work

• Flexible cured foam suitable for door and window movement

• 24 oz can — contractor-grade yield