DAP Wall & Cavity Spray Foam, 20 oz Off White with Wide-Spray Applicator

DAP Wall & Cavity Foam is a 20 oz one-component polyurethane spray foam for air sealing and insulating building cavities, with a wide-spray applicator included.

• Wide-angle spray pattern with responsive flow control — covers wall and building cavities with a one-part aerosol system.
• Closed-cell foam for air sealing and insulation — helps keep moisture out of structures.
• Class A fire-rated foam — designed to meet building codes.
• Application range of 40°F to 120°F (4°C to 49°C) — suits projects across a wide range of temperatures.
• R-value of 4.1 at 1 inch (25 mm) — adds thermal insulation to the structure.
• Included wide spray applicator — ready for targeted filling, touch-ups and smaller repairs.

Gaps in walls and other building cavities can allow air movement and reduce the effectiveness of insulation. DAP Wall & Cavity Foam is made for interior sealing and insulating work around homes and buildings, from cavity applications to smaller repairs. Its wide spray pattern helps cover broader areas than a narrow stream, while the self-contained one-component format provides an alternative to two-component spray systems.

Where can DAP Wall & Cavity Foam be used?

DAP Wall & Cavity Foam is intended for filling, air sealing and insulating stud wall cavities, rim joists, crawlspaces, attics and basements in homes and buildings. It is for interior use on wood, masonry, metals and drywall, making it suitable for a range of building surfaces and repair areas. Use it for rim-joist work, touch-ups and smaller projects where foam insulation can help close gaps and add thermal insulation.

• Application areas include stud walls, rim joists, crawlspaces, attics and basements.
• Compatible interior surface types include wood, masonry, metal and drywall.
• Pack contents: one 20 oz aerosol can with a wide spray applicator.

What makes its spray pattern different?

The patent-pending applicator produces a consistent wide-angle spray pattern similar to two-component foam systems, using an easy-to-use one-component aerosol. Its flow-control trigger responds to pressure, helping direct foam across a wider area for cavity work and smaller repairs. The can is a self-contained polyurethane foam system, so the product combines the foam and application method in one package.

• One-component polyurethane foam in an aerosol can.
• Wide-angle applicator with responsive flow control.
• Designed to apply across a temperature range of 40°F to 120°F (4°C to 49°C).

What insulation and fire-rating details should I know?

DAP Wall & Cavity Foam has an aged R-value of 4.1 at a thickness of 1 inch (25 mm), measured to ASTM C518. The closed-cell formula air seals and insulates while helping keep moisture out of structures. It is Class A fire-rated and intended to meet building codes; its added thermal insulation can help reduce energy use, with savings of up to 30% on energy costs.

• ASTM C518 aged R-value: 4.1 at 1 inch (25 mm).
• Closed-cell foam provides air sealing and thermal insulation.
• Class A fire rating for building-code applications.

How long does the foam take to dry and cure?

The foam becomes tack-free in 7 to 12 minutes and fully cures in 4 hours. Actual timing depends on foam thickness and the surrounding temperature and humidity, so those conditions matter when planning the next stage of a project. The tack-free time and full-cure time describe different stages: the surface first stops feeling tacky, then the foam completes curing.

• Tack-free time: 7 to 12 minutes.
• Full cure: 4 hours, depending on thickness, temperature and humidity.

This foam suits homeowners and building project teams sealing interior cavities, rim joists and other listed areas, as well as handling touch-ups and smaller repairs. Its included wide-angle applicator, closed-cell polyurethane formula and one-component format make it a fit for projects that call for broad spray coverage and added air sealing and insulation.