Polyurethane foam is temperature-sensitive. Most Devfoam products require a minimum ambient temperature of 45°F (7°C). In cold weather, warm the foam cartridges in hot water before use. Cold foam will be too viscous to penetrate thin cracks.
To prevent puncturing the closed-cell foam, use a rounded tool. Run the tool along the crack to confirm the Devfoam is seated between ¼ inch and ½ inch below the surface. If the foam is too shallow, the sealant will be too thin and break. If too deep, the sealant will over-extend and tear.
Many homeowners ask: Why not just use epoxy? The answer lies in the application. devfoam crack work
| Feature | Devfoam (Polyurethane) | Epoxy | | :--- | :--- | :--- | | Water Activation | Works in wet/actively leaking conditions | Requires completely dry surfaces | | Flexibility | Remains flexible (up to 200% elongation) | Cures rigid and brittle | | Sealing Action | Expands to fill voids | Requires perfect surface contact | | Best For | Stopping flowing water, sealing live leaks | Structural bonding of dormant, dry cracks |
Devfoam crack work is the superior choice for basement walls, tunnels, and retaining walls where hydrostatic pressure is present. Epoxy is better for load-bearing structural beams. Polyurethane foam is temperature-sensitive
Properly executed Devfoam crack work should last between 10 and 20 years. However, you should inspect joints annually. Look for:
If you see these signs, remove the old sealant, pull out the existing Devfoam (use a hook tool), and redo the process. Do not simply cap old sealant with new—this creates a weak layer. If you see these signs, remove the old
Before diving into the technique, it is crucial to understand why many crack repairs fail prematurely. Most people assume that simply pouring liquid sealant into a crack will solve the problem. Unfortunately, this leads to three-point bonding.
When sealant adheres to the bottom of the crack as well as the two sidewalls, the material has no room to stretch or compress. As the concrete expands with heat or contracts with cold, the sealant tears apart. Devfoam acts as a bond breaker. By filling the lower portion of the crack or joint, Devfoam ensures the sealant only adheres to the two vertical sidewalls, allowing it to flex in an hourglass shape to accommodate movement.