Gaps & Cracks Foam is a high-expansion polyurethane foam designed to fill, seal, and insulate openings of all sizes, especially irregular cavities, wall penetrations, and larger voids where low-expansion foam is not sufficient. Whether you're repairing drywall, sealing plumbing penetrations, or insulating around window and door frames, this expanding foam provides strong adhesion, airtight insulation, and long-term durability.
Explore our complete selection of professional-grade foams engineered specifically for filling gaps, cracks, joints, and cavities.
Why Use Gaps & Cracks Foam?
Gaps & Cracks foam is formulated for high expansion, allowing it to fill larger spaces efficiently while providing:
- Superior filling capacity for large and irregular voids
- Strong adhesion to wood, concrete, masonry, metal, and drywall
- Airtight and moisture-resistant sealing
- Mold- and mildew-resistant performance
- Straw- and gun-grade options for any project size
- UL-classified formulations for safety and performance
Perfect for DIY repairs, remodeling, energy upgrades, and professional installation projects. For a wider range of sealing and insulation solutions, explore our full collection of Foam Sealants.
Best Uses for Gaps & Cracks Foam
- Filling large wall penetrations
- Sealing gaps around plumbing, vents, cables, and HVAC lines
- Closing gaps in attic, crawl space, and basement framing
- Repairing drywall cracks and wall cavities
- Insulating electrical outlets and water pipes
- General building insulation and energy-efficiency upgrades
How to Apply Gaps & Cracks Foam
- Clean, dry, and lightly moisten the surface for best adhesion.
- Shake the can vigorously and attach the straw or gun applicator.
- Hold the can upside down and apply foam into the deepest part of the gap first.
- Apply in layers for huge voids, allowing slight curing between passes.
- Do not overfill; the foam will continue to expand.
- Allow 24 hours for full cure.
- Trim, sand, plaster, or paint as needed.
Gun foam options offer maximum precision and yield.
Recommended Gaps & Cracks Foam Products
Stanley F905P Gaps & Cracks Pro Foam – Gun Foam, 24 oz
A professional-grade, high-yield gun foam designed for filling large gaps and cavities with strong adhesion and top-tier insulation. Moldproof, waterproof, and UL certified.
Explore Stanley F905P Gaps & Cracks Pro Foam for full specs and purchase options.
Stanley F905 Gaps & Cracks Foam – Straw Applicator, 12 oz / 24 oz
User-friendly straw foam is ideal for DIY gap filling around drywall openings, wall penetrations, outlets, piping, and general repairs. Offers high expansion and UL-certified safety.
View Stanley F905 Gaps & Cracks Foam to compare sizes and features.
Akfix 805 Gap Filler Straw Foam – 12 oz / 25.3 oz
High-expansion formula ideal for filling larger voids and cavities. Economical, moldproof, waterproof, paintable, and UL certified.
Shop Akfix 805 Gap Filler Foam for cost-effective large-gap sealing.
Kraken Bond Gaps & Cracks Straw Foam – 12 oz / 24 oz
Eco-friendly, UL-certified formula with excellent thermal and acoustic insulation. Ideal for general gap filling, wall penetrations, and window/door profile sealing.
Browse Kraken Bond Gaps & Cracks Foam for reliable air sealing and insulation.
Akfix 805P Pro Gap Filler – Gun Foam, 29 oz
Pro-grade, high-yield gun foam offering up to 45 liters of expansion. Strong adhesion, fast curing, moldproof, waterproof, and UL classified.
Explore Akfix 805P Pro Foam for maximum yield and professional performance.
Sprayman Gaps & Cracks Straw Foam – 12 oz
Moisture-curing straw foam offering excellent bonding, airtight sealing, and superior insulation. Perfect for general repairs, draft sealing, and cavity filling.
See Sprayman Gaps & Cracks Foam for detailed specs and pricing.
Frequently Asked Questions (FAQ)
What is Gaps & Cracks Foam used for?
It is a high-expansion polyurethane foam designed to fill and insulate gaps, joints, cavities, and wall penetrations.
What’s the difference between gap filler and spray foam insulation?
Gap filler is a single-component foam for sealing small openings, while spray foam insulation is a two-component system for insulating large areas with high R-value.
What is the difference between Gaps & Cracks Foam and Window & Door Foam?
Gaps & Cracks Foam expands more, making it ideal for larger voids. Window & Door Foam is low-expansion to avoid frame distortion.
Is Gaps & Cracks Foam waterproof?
Yes, most formulas cure into a waterproof, mold-resistant seal suitable for interior and exterior use.
Can cured foam be trimmed or painted?
Yes. Once cured, Gaps & Cracks Foam can be trimmed, sanded, plastered, or painted.
Straw or gun-grade: what should I choose?
- Straw foam: Best for DIY and small repairs
- Gun foam: Best for pros or large-volume projects needing precision