Start with the symptom, not the system
Nobody searches for a membrane specification — they search for a wet ceiling. These 40 pages start from what you can actually see, rank the probable causes by how often each one turns out to be the source, and tell you how to narrow it down yourself before anyone quotes you for anything.
Urgent — 10 problems
Safety risk or rapid escalation. These should not wait for the monsoon to end.
- most commonVisible crack in an RCC slab or beam
Shrinkage cracking from inadequate curing.
- most commonWater collecting in the basement
Groundwater under hydrostatic pressure against the structure.
- most commonWater collecting in the lift pit
Groundwater entering through the pit walls and base.
- most commonUnderground water tank contamination or loss
Groundwater entering through the tank shell.
- most commonPlaster falling off an external wall
Plaster debonded through prolonged water saturation.
- most commonRusting reinforcement visible in a beam or column
Long-term water ingress reaching the reinforcement.
- most commonConcrete flaking or falling from a ceiling or soffit
Reinforcement corroding and expanding behind the cover.
- most commonCracked or falling chajja and projection
Reinforcement corrosion in a thin section with little cover.
- most commonChemical bund or containment lining failing
Resin chemistry mismatched to the stored chemical.
- most commonWet-area leakage in a hospital or clinical building
Unsealed penetrations in high-use wet areas.
Act this season — 21 problems
Not an emergency, but worse and more expensive with every monsoon it survives.
- most commonWater leaking from the ceiling in a top-floor flat
Terrace waterproofing has failed or was never laid to a fall.
- most commonBathroom leaking into the flat below
Pipe penetration through the sunk slab was never collared.
- most commonWater seeping through an external wall during rain
Plaster has debonded and is holding water against the wall.
- most commonWater standing on the terrace after rain
The terrace was never laid to a fall.
- most commonOverhead water tank leaking
Cracking at the wall-to-base junction.
- most commonLeakage along a building expansion joint
Sealant has aged, torn or debonded.
- most commonPodium leaking into the parking below
Planter drainage omitted, leaving soil saturated against the barrier.
- most commonSwimming pool losing water
Leaking pipework, skimmer or balance tank.
- most commonLeakage in a service duct or shaft
Leaking drainage stack or joint within the shaft.
- most commonToilet leaking into the flat below
Soil pipe penetration not properly collared.
- most commonDamp patch on the ceiling below a bathroom
Unsealed pipe penetration in the sunk slab above.
- most commonTerrace coba sounding hollow when tapped
Bond coat omitted when the coba was laid.
- most commonPersistently damp basement walls
Groundwater passing through the retaining wall.
- most commonRefuge floor leaking into the flats below
Railing and balustrade fixings drilled through the barrier.
- most commonCracking along the parapet wall
Thermal movement with no coping or joint provision.
- most commonWarehouse or industrial roof leaking
Blocked or under-sized gutters and downpipes.
- most commonThe society terrace keeps leaking after repairs
Fall never corrected, so water still ponds.
- most commonA new building is already leaking
Waterproofing rushed to meet a handover date.
- most commonDamp in a heritage or lime-mortar building
Cement render or impermeable paint applied over lime fabric.
- most commonStilt parking ceiling leaking
Wet-area waterproofing failure in the flats above.
- most commonBalcony leaking into the flat below
Fall running toward the building rather than away.
Plan it — 9 problems
Stable enough to schedule properly, ideally before the next monsoon.
- most commonDamp patch spreading on an internal wall
Hollow or cracked external plaster on the other side of the wall.
- most commonWhite powder or crystals forming on walls
Persistent water movement through the masonry.
- most commonPaint peeling or blistering after the monsoon
Painted over hollow plaster.
- most commonChina mosaic pieces lifting or coming loose
Thin or dry bedding mortar with poor adhesion.
- most commonWater entering around a window frame
Perimeter sealant aged, split or debonded.
- most commonCracked grout or lifting tiles in a wet area
Normal grout ageing and shrinkage.
- most commonIndustrial floor breaking up under traffic
Coating specified without regard to wheel loading.
- most commonDamp in the tank or pump room
Leakage from the adjacent tank structure.
- most commonDamp on staircase and common area walls
Hollow external plaster on the staircase elevation.
Not sure which of these it is?
Send a photograph taken while it is actively wet, with a note on whether it worsens with rain or with usage. That is usually enough for a first opinion, and the inspection that follows is free.
Mon–Fri 08:00–18:00 · Sat 09:00–16:00 · Jogeshwari West