New Tech Water Proofing

Widen Cracks: Use a chisel to widen cracks into a "V" shape for better sealant adhesion.

Hydraulic Cement: Apply a mixture of hydraulic cement directly onto the damp crack, pressing firmly until it sets.

Polyurethane Grout: Inject polyurethane grout using a gun for deep cracks to ensure they are filled, as suggested in Dr. Fixit's blog.

Waterproofing Coating: Apply a high-performance, water-resistant, or epoxy-based coating to the entire inner surface for long-term protection, such as those recommended

Tar felt sheets, or bituminous membranes, are flexible,, multi-layered waterproofing materials made by coating a core fabric (hessian, fiberglass, or polyester) with oxidized bitumen. Designed to prevent water leakage in roofs, basements, and terraces, these sheets are durable,, tear-resistant, and, often surfaced with sand or plastic for protection.