Waterproofing & Leakage Repair in Mumbai
Water rarely enters where the stain appears. Treat the stain and you have bought one monsoon.
Free site visit for Waterproofing
Measured survey, 3D concept and an itemised quote — at no cost.
What waterproofing actually involves
A damp patch on a ceiling is the end of the journey, not the start of it. Water enters at a crack, a parapet junction or a failed outlet, travels sideways under the screed — sometimes several metres — and drops where it finds a service penetration or a construction joint.
This is why coating the visible patch works for a season and then stops. The coating was applied several metres from the actual entry point. In Mumbai, where roughly 2,200 mm of rain arrives in about ninety days and most of it is driven sideways by sea wind, that margin for error is very small.
Our approach
We trace the source before specifying anything — flood test, dye test or moisture mapping depending on the situation. Where the existing system can be saved, we say so and quote an overlay. Where decades of layered patch repairs have trapped moisture against the slab, we strip back to sound concrete, cut and fill live cracks, form 75 mm fillet coving at every vertical junction, and build a full system with the membrane carried 300 mm up the parapet into a chased groove. Every terrace is ponding tested for 48 to 72 hours before handover.
Common problems we are called for
- Ceiling damp a metre or more from where the water is actually entering
- Water standing on the terrace for days because the surface has no fall to the outlets
- Cracks along the parapet junction where the membrane was turned up without coving
- Bathroom leaks reaching the flat below, discovered only when the neighbour complains
- Old brickbat coba that has cracked and is now holding water inside the roof build-up
What you get from doing this properly
Source traced, not guessed
Flood test, dye test or moisture mapping before any material is specified.
Full system, one price
Removal, crack treatment, coving, membrane and protection screed quoted as one scope.
Tested before you accept
48 to 72 hour ponding test completed and witnessed before handover.
5-year written warranty
Issued with material batch records and an annual inspection offer.
How we run a waterproofing project
Free site inspection
An engineer traces the leak to its actual source and photographs everything. Within 24 to 48 hours.
Written diagnosis
A report explaining the cause, the recommended system and the areas involved, in plain language.
Itemised quotation
Measured area, named materials, timeline, warranty and exclusions stated plainly.
Surface preparation
Failed layers removed, cracks cut and filled, corners coved, substrate moisture checked.
System application
Primer, membrane and protection layers to specification, with daily photographic records.
Ponding test and handover
48 to 72 hour test, joint walk-through, warranty certificate and material documents.
What goes into the specification
We name every material by type and grade in the quotation, and hand over documentation at completion. No unbranded line items.
An overlay is often the honest answer
If your existing system is sound and the failure is confined to junctions and outlets, stripping the whole terrace is a waste of your money. An overlay with proper coving at the junctions will hold. The survey establishes which situation you are in — and if water is trapped under the existing build-up, we will tell you that patching it will not last, because it will not.
Waterproofing services we provide
Terrace Waterproofing
A terrace leak is rarely above the stain. Water travels sideways under a failed screed before it drops.
Read more →Roof Waterproofing
Different roof types fail in completely different ways, so the survey has to come before the specification.
Read more →Bathroom Waterproofing
By the time the neighbour below complains, the water has usually been travelling for months.
Read more →Basement Waterproofing
A basement deals with water under pressure, which is a fundamentally different problem from rain landing on a roof.
Read more →External Wall Waterproofing
In Mumbai more water enters through the walls than through the roof, because the rain arrives sideways.
Read more →Seepage Treatment
Seepage is a symptom. Treating the wall without finding the source is the most common waste of money in building repair.
Read more →Leakage Repair
Finding the leak correctly is most of the job. Sealing it is usually the easy part.
Read more →Roof Leakage Repair
If a roof has been patched three times, the fourth patch is not the answer.
Read more →Injection Grouting
Polyurethane grout uses the leak itself as a catalyst — the more water present, the faster it reacts.
Read more →What clients say
Three contractors had coated our terrace over six years. SpaceCrafta flood tested it and found the entry was at the parapet, nowhere near the stain in my ceiling. They rebuilt that junction properly. Two monsoons and the ceiling is dry.
Deepak RautSecretary, CHS, Borivali EastWaterproofing — frequently asked questions
How much does waterproofing cost in Mumbai?
It depends on the area, the condition of the existing surface and whether an overlay will hold or the terrace has to be stripped. Those are very different jobs. We measure on site and give an itemised rate per square foot with materials named by brand and grade, so you can compare quotations honestly instead of guessing what each one includes.
Can waterproofing be done during the monsoon?
Emergency leak sealing and PU injection grouting can, because those work with water present. Full membrane systems cannot — they need a dry, prepared substrate to bond. We will secure your building against active leakage and schedule the permanent work for a dry window.
How long does terrace waterproofing take?
A 2,000 sq ft terrace rebuilt fully takes 12 to 18 working days including curing and the ponding test. An overlay on a sound substrate finishes in 4 to 6 days. The ponding test is 48 to 72 hours of that and is not something to compress.
Do the tiles have to come off?
Not always. If the tiles are well bonded, the terrace drains properly and the leak is at junctions, an overlay system can work over them. If water is trapped underneath, they have to come off — patching over trapped moisture fails. The survey tells us which it is.
What warranty do you give?
Five years in writing on full systems, issued with the material batch records and application logs. We also offer a documented annual inspection so small issues get caught before they become leaks again.
Related services
Home Renovation
In a 1980s Mumbai flat, the renovation budget is decided by what is behind the walls — and nobody finds that out by looking at the floor plan.
Read more →Painting
Paint failure is almost never the paint. It is the surface underneath, and the number of coats that were actually applied.
Read more →False Ceiling
Nearly every false ceiling that cracks within two years cracks for the same reason — the framing, not the board.
Read more →Architecture
An elevation that was drawn before the plan was settled is a picture, not a design — and it will not survive contact with the structure.
Read more →Waterproofing across Mumbai and beyond
Every area page sets out the local building stock and the conditions that actually drive the work there.