How do you seal basement walls?

To seal basement walls, start by cleaning the surface to remove dirt, mold, or old paint. Next, apply a waterproofing sealant or paint specifically designed for masonry surfaces, using a brush or roller for even coverage. For cracks or gaps, use a hydraulic cement or a polyurethane sealant before applying the waterproof coating. Finally, ensure proper drainage around the foundation to prevent future moisture issues.