Waterproofing Material Calculator
Estimate how much waterproofing material a roof or terrace needs — and roughly what it costs. Pick the system, set the area and coats, and get an indicative quantity and cost range. Surface preparation and application are a licensed contractor’s job — treat this as a planning frame, then confirm with local quotes.
Most liquid systems want 2 coats, cross-applied.
Allow for uneven surfaces, corners, upstands and sheet laps.
at ~1 kg/m² per coat × 2 coats + 10% wastage
Brush/roller coating for terraces. Cheap and easy to recoat; UV-tolerant; needs a sound, dry, primed slab. The single biggest driver of success is surface preparation, not the tin you buy — a great membrane over a damp, dirty or ponding slab still fails.
An indicative estimate only. Consumption rates and prices are broad 2026 figures that vary with brand, substrate condition, film thickness, detailing at upstands and drains, site access, scale and the local market — and they change over time. Always follow the manufacturer’s datasheet for coverage and coats, and get written local quotes. Waterproofing application and any work at height are qualified professional work.
Related Guides — Deep-dive reading
When Waterproofing Blisters, Peels or Cracks: Reading a Failing Roof Coating
How to recognise the ways a terrace waterproofing layer fails — blisters and bubbles, alligatoring and surface crazing, peeling and de-bonding, pinholes, open membrane laps — what each one reveals about the root cause, and the honest recoat-versus-full-re-waterproof decision. Read it from a safe vantage; the assessment and every bit of the work belong to a licensed waterproofing contractor.
RoofingFlat Roof & Terrace Waterproofing
The flat RCC terrace is India's most common roof and its most common leak — because water barely slopes off it. This guide explains why flat roofs are the hardest to keep dry, the traditional methods (brick-bat coba, mud-phuska, lime terracing, china-mosaic) versus the modern ones (liquid membranes, torch-applied felts, inverted systems), the fall-to-drain and layered build-up that actually stop leaks, and how to re-do a leaking old terrace. Plain language, India-grounded.
RoofingRoof Replacement Cost & When to Replace
What it really costs to replace a roof in India in 2026, and how to know when it is time — the repair-vs-replace call, indicative cost ranges by roof type, the hidden costs that surface when the old roof comes off, why to re-roof before solar, and how to control cost without cutting corners. Plain language, India-grounded.
RoofingRelated Tools — You may also find these useful
Rainwater Harvesting Calculator
How much rainwater your rooftop can harvest in a year, in litres and kilolitres, from the roof area, your city's rainfall and roof type — with a suggested storage-tank size.
RoofingRoof Area Calculator
The true (sloped) surface area of a roof from its plan footprint and pitch, in m² and sq ft, with a wastage allowance and rough tile/sheet/coating counts — the area you actually buy roofing materials for.
RoofingRoof Cost Calculator
An indicative cost range to build a roof in India, by roof type (RCC, tiled, metal, sheet), area, waterproofing, insulation and city — total and per sq ft. A budgeting frame to confirm with local quotes.
Roofing