What is cementitious waterproofing and where is it typically used?

• A. A cement-based epoxy coating for roofs
• B. A cement-based slurry or coating that provides waterproofing for foundations, tunnels, decks, and below-grade areas
• C. A polymer-modified bituminous membrane for above-grade walls
• D. An acrylic surface sealer for interior floors

Answer: (B)

Cementitious waterproofing is a cement-based slurry or coating that creates a waterproof barrier on concrete surfaces. It’s designed for areas where water intrusion is a concern, such as foundations, tunnels, decks, and other below-grade or damp spaces. When applied and cured, it forms a dense, cement-like layer that bonds to the substrate and blocks water by filling pores and capillaries in the concrete. It’s typically used as a thin slurry or coating and often includes polymer additives to improve adhesion and flexibility, applied by brush, trowel, or spray. This approach is chosen for its durability, cost-effectiveness, and compatibility with concrete in challenging, water-exposed environments. Other options describe non-cementitious systems (like epoxy coatings, bituminous membranes, or acrylic sealers) that serve different purposes or substrate needs.