Waterproofing — crystalline, bituminous, PU and cementitious compared

Water ingress is the single most common cause of structural damage and interior damage in Indian buildings. Choosing the right waterproofing system for each location can prevent decades of repair costs.

For terraces and flat roofs, use a PU (polyurethane) or bituminous membrane system — these flex with the structure and handle Bengaluru's monsoon. For bathrooms, cementitious waterproofing applied before tiling is standard and effective. For water tanks and sumps, crystalline waterproofing is the best choice — it becomes part of the concrete and is permanent. Never use acrylic coating alone as the primary waterproofing system — it is a top coat, not a primary barrier. Always waterproof before tiling or plastering — retrofitting is 3–5× more expensive.