PU Foam Injection

PU injection, also polyurethane grouting or injection, is a waterproofing technique that uses expanding injected polyurethane to prevent water flowing through and voids or cracks typically in concrete. This is effective in solving water leakage issues, especially when applied on the underside of the seepage area where the leak occurs.

These elastomeric, fast-setting foams are effective alternatives for applications involving only crack sealing (waterproofing) and not structural repair. Because of their elastomeric nature, they are able to accommodate slight concrete movement so the seal stays intact. They also begin to harden and foam within minutes of injection. This reduces the chances of the material flowing out of an injected crack while still in liquid form, and even if some does leak out, the foam will fill the void. Polyurethanes are great for basic crack filling.