Würth 12oz Expanding Foam Sealant for Big Gaps up to 3 inches - Insulating Spray Foam

When small-gap foam just won't cut it, reach for the Würth 12 oz Big Gaps Expanding Foam Sealant, a professional-grade insulating spray foam engineered to tackle the larger openings that standard gap fillers leave behind. Designed to fill gaps and cracks up to 3 inches wide, this heavy-expanding formula bonds to wood, concrete, brick, drywall, and most common building materials to create a durable, airtight, and water-resistant seal that resists shrinking and sagging over time. Once cured, it forms a weatherproof barrier that helps reduce heating and cooling costs by sealing out air leaks, moisture intrusion, and common pest entry points around larger openings such as pipe penetrations, foundation gaps, sill plate voids, rim joists, and rough framing cavities. The foam also provides thermal and acoustic insulation, helping dampen sound transmission and improve overall home comfort year-round, even in low-temperature conditions. The fast-curing formula goes tack-free in just 10 minutes and can be cut, sanded, trimmed, or painted after 60 minutes, so you can get the job done and move on without a long wait. Application is straightforward: shake the can, attach the included straw, and spray upside down for controlled, targeted coverage even in hard-to-reach spaces. From Würth, a globally trusted name in professional tools and chemicals, this 12 oz can gives you better quality and performance at an everyday low price, making it the smart choice when you need serious gap-filling power without overpaying.

• Fills Big Gaps & Cracks Up to 3 Inches Wide: Purpose-built for larger openings that standard gap-filler foams can't fully seal, including pipe penetrations, foundation voids, sill plates, rough framing gaps, and more
• Airtight, Water-Resistant & Weatherproof Seal: Blocks air leaks, moisture intrusion, and common pest entry points to help improve home comfort and energy efficiency year-round
• Thermal & Acoustic Insulation: Reduces heat loss, lowers energy costs, and dampens sound transmission between walls, floors, and rooms
• Bonds to Most Common Building Materials: Adheres strongly to wood, concrete, brick, drywall, and more for a durable seal that resists shrinking and sagging
• Fast Curing Formula: Goes tack-free in just 10 minutes and can be cut, sanded, trimmed, or painted after 60 minutes so you can finish your project quickly
• Works Indoors & Outdoors: Performs reliably in low temperatures, making it suitable for interior and exterior applications in any season
• Simple 3-Step Application: Shake the can, attach the included straw, and spray upside down for precise, controlled coverage even in tight or hard-to-reach spaces
• Professional-Grade Quality at an Everyday Low Price: From Würth, a globally trusted name in professional tools and chemicals, built to outperform other foams in its price range
• 12 Ounce Can: Lightweight and easy to handle, with enough coverage for multiple large-gap sealing and insulation projects around the home