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Polyurethane foam injection for basement foundation crack repair


The injection of polyurethane resin, sometimes referred to as urethane, is an outstanding waterstopping repair method for foundation cracks and various other basement leaks. This is because the resin transforms itself into a flexible foam that fills and seals voids in foundation walls.

Polyurethane injection is used extensively worldwide for waterstopping in underground mining applications, subway tunnels, and virtually any underground structure. While the injection of polyurethane is only suitable for leak repairs in poured concrete basement foundations, its versatility has made it the number one waterstopping method across the globe.

Typical polyurethane injection applications

The images below show a few of the most typical applications for the injection of polyurethane for residential foundation leak repairs.

Injection PolyurethaneInjection of Polyurethane for Pre existing Crack RepairInjection of Polyurethane to Repair Leaking Tie rod Hole

These images show the injection of polyurethane for concrete crack repair, tie-rod hole waterproofing and the repair of a leaking basement crack that someone tried to repair solely by using hydraulic cement.

One of the greatest advantages of injecting polyurethane is the expansive qualities of the polyurethane resin. In polyurethane injections, the polyurethane resin is injected under pressure as a fluid; however, it chemically expands into a flexible foam within just a few minutes. These expansive qualities of the polyurethane are highly desirable because the force of the chemical expansion is significant and therefore the polyurethane will find and fill any void that it can get into.

Polyurethane resin can be dispensed at low pressure. When you purchase a do-it-yourself polyurethane injection kit you are purchasing a low pressure system. In the images above you will notice the presence of white injection packers as well as a hydraulic hose coupled to one of the injection packers. The use of injection packers is common among waterproofing contractors; their use is necessary because professional injections of polyurethane are typically performed at high pressures to ensure that polyurethane penetrates a foundation crack completely and fills it right to the soil outside.

Click on the hyperlink for more information on polyurethane crack injection.


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