Stop leaking basement wall cracks permanently with professional-grade urethane crack injection. Repair poured concrete foundation walls, basement walls, crawl spaces, and retaining walls from the inside—no excavation or contractor required. RadonSeal’s two-component expanding polyurethane injection foam penetrates deep into foundation wall cracks and expands to fully seal water leaks, vapor intrusion, insects, and radon gas. Complete DIY foundation crack repair kits are available in 5-ft, 10-ft, and 20-ft options and require only a standard caulking gun. Don’t have one? Simply add it to your order and we’ll ship it with your kit.
