How To Injection Concrete Wall Cracks With Polyurethane

The limits of low pressure injection.

How to injection concrete wall cracks with polyurethane.

Within minutes the polyurethane undergoes a chemical transformation from a liquid to a solid. Concrete crack injection with polyurethane foam is the best way to stop a foundation wall crack leak. The crack must have an opening greater than 1 16 or 1 5 mm. 2 larger cracks require more epoxy injection pressure.

This is because the liquid urethane fills the entire foundation crack. The secret to effective crack injection whether using epoxies or polyurethane foams is gradual introduction of the liquid polymer into the crack at low pressures 20 to 40 psi. To repair a crack embedded in the walls or foundations of your home two products are very commonly used. Otherwise it will be impossible to inject a sealing liquid into the narrowest part of the crack.

Flexible polyurethane and epoxy. Polyurethane is a fluid resin which is injected into concrete cracks rock fissures expansion joints and other voids in solid underground structures. Once inside the crack it begins to foam and expand. 3 when filling wide cracks wait some time not a lot ensuring that the epoxy is filling the concrete crack.

Although this method is effective in many situations it does have some limitations. During a repair the technician either carries out their work with a flexible polyurethane injection or an epoxy injection into the crack to seal and waterproof the foundation. This article explains how to use injected polyurethane foam to repair a concrete basement or crawl area wall or slab crack in order to stop basement or crawl space water entry or air leakage. 4 remove the top seal using a chisel or scraper.

Foundation wall or slab crack repair using polyurethane foam injection. For example on an 8 thick wall we drill so the hole crosses 4 inside the wall. How polyurethane injection works. 1 start with a low pressure injection setting and increase the pressure as needed.

Leaking concrete structures can be permanently repaired with concrete crack injection curtain wall procedures using water activated polyurethane foam. When used in concrete crack injection applications the polyurethane is injected into a crack. The expanding foam completely fills it and prevents future water leaks. The method is not very suitable for repairing cracks on a concrete foundation wall.