Polyurethane vs. Epoxy Injection for Leaking Basement Walls
We recently stripped back some wood paneling in our finished basement and discovered a diagonal crack running down the poured concrete wall with clear signs of past moisture entry. I have been researching repair options, but I am confused about when contractors use flexible polyurethane injection versus rigid epoxy injection. Which material is better for stopping groundwater leaks in Toronto foundation walls?
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The right material depends on whether the crack is actively leaking water or serving as a structural tie. Polyurethane foam expands rapidly upon contact with moisture, filling the entire depth of the crack out to the exterior soil with a flexible seal that expands and contracts with thermal shifts. Epoxy, on the other hand, restores structural shear strength to dry, non-moving concrete. You can review crack repair methods and materials at https://leaquida.ca/interior-waterproofing-toronto/crack-repair/ A technician will inspect the crack's movement and moisture level to determine the correct injection compound.