Area-Specific Waterproofing in Mumbai

Terrace waterproofing is the application of a continuous water barrier across a roof slab, laid to a fall so rainwater drains rather than ponds. In Mumbai the usual choices are brick bat coba with china mosaic, an APP or SBS torch-on membrane, or a liquid-applied polyurethane or polyurea coating.

IS 3067 · IS 1346

Basement waterproofing protects a below-grade structure against groundwater under hydrostatic pressure. Because the water pushes inward continuously, the reliable approach is a box-type system — a continuous barrier wrapping raft and retaining walls — applied pre-construction where possible.

IS 3067 · IS 12200

Bathroom waterproofing seals the sunk slab and wet-area walls so water from daily use cannot reach the flat below. It is applied to the sunken portion before filling, carried up the walls as a skirting, and dressed carefully around every pipe penetration.

IS 3067

Toilet waterproofing seals the sunken slab, wall skirting and pipe penetrations of a WC area so water cannot migrate into the structure or the flat below. It is the same discipline as bathroom waterproofing, with particular attention to the soil pipe and floor trap penetrations, which are the most common leak paths..

IS 3067

Overhead water tank waterproofing lines the internal faces of an elevated potable-water tank with a non-toxic, water-resistant system, and treats the external faces and base where leakage tracks into the structure below. Because the water is for drinking, the internal lining must be a food-grade, potable-water-safe product — not a general-purpose coating..

IS 3067

Underground tank waterproofing must resist water in both directions — the stored water pushing out, and groundwater pushing in. It combines an internal potable-safe lining with external or pre-applied below-grade protection, plus careful treatment of the wall-to-base junction and every pipe penetration..

IS 3067 · IS 12200

Swimming pool waterproofing lines the pool shell so treated water cannot escape into the structure and so chemically treated water cannot attack the concrete. It must tolerate permanent water immersion, chlorine or salt chemistry, and the movement of a filled and emptied shell, then accept tile or a finish over the top..

IS 3067

Podium waterproofing protects a landscaped or trafficked deck sitting above occupied space — typically parking, a clubhouse or retail. It is demanding because the barrier must survive planter soil, vehicle loads and heavy detailing around drains and columns, while any failure shows up as a leak into the space below, where it is expensive to trace..

IS 3067

Lift pit waterproofing seals the lowest point of a building's shaft, which sits below the water table in most of Mumbai and collects anything that runs down the shaft. Standing water in a lift pit is a safety and equipment issue as much as a building one, so treatment is usually a combination of PU injection to stop active ingress and a tanking system to hold it..

IS 3067

Refuge area waterproofing protects the open fire-refuge floors mandated in Indian high-rises. Because these are exposed slabs sitting directly above occupied flats, any failure appears immediately as a ceiling leak below, and the detailing at the open edge and railing bases is where problems start..

IS 3067