Waterproofing & Leakage
Sunken slab waterproofing for bathrooms that leak downstairs
We drain trapped water from the sunken portion, renew waterproofing and refill properly so the flat below stays dry.
Many Indian bathrooms are built on a sunken slab: a recessed area filled with debris that hides the drain pipes. When waterproofing fails, the filling becomes a reservoir, soaking the slab and dripping into the room below.
Surface repairs cannot reach this trapped water. RennovEN opens the floor, removes the saturated fill, renews waterproofing and refills with lightweight material.
Signs you need this
- Ceiling below the bathroom is always damp
- Leak continues for days after bathroom use stops
- Floor tiles sound hollow
- Smell from the floor near the drain
The RennovEN promise
- 10-year warranty on all works
- Itemised pricing, approved before work begins
- One accountable team across every trade
- Residential specialists — homes only
Diagnosis
Why it happens
Trapped water in fill
Brick-bat and debris fill absorbs leaking water and holds it against the slab.
Failed membrane
Original waterproofing has cracked or was never fully applied.
Leaking pipe joints
Old drain joints inside the sunken area leak continuously.
Our method
How RennovEN does it
- 1
Open floor
Remove tiles and saturated filling.
- 2
Repair pipes
Replace drain pipes and joints inside the sunken area.
- 3
Waterproof
New membrane with corner and pipe detailing; flood test.
- 4
Refill & tile
Lightweight fill, correct slope and new tiles.
What’s included
- Removal of tiles and old filling
- Drain pipe replacement in the sunken area
- New waterproofing membrane
- Flood test before refilling
- Lightweight fill, slope and tiling
What affects the cost
- Bathroom size and sunken depth
- Pipe replacement required
- Tile and fitting choices
- Ceiling repair below
Every home is different, so we don’t publish rate cards. After a free inspection you get an itemised estimate, and you approve every line before work begins.
Get my itemised estimate10-year warranty
The sunken slab waterproofing, pipework and tiling we execute are covered for 10 years against leakage due to our workmanship.
How our warranty worksFAQ
Sunken Slab Waterproofing: your questions
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