Waterproofing & Leakage
Water tank waterproofing — safe for drinking water, sealed for years
Overhead and underground RCC tank waterproofing with potable-grade coatings, crack repair and inlet sealing.
A leaking water tank wastes water, damages the structure around it and, in underground sumps, can let contaminated groundwater in.
Tanks hold drinking water, so not every waterproofing product is safe to use. RennovEN uses coatings suited to potable water and seals the joints and pipe entries where tanks usually leak.
Signs you need this
- Tank level drops with no usage
- Damp walls around the sump or overhead tank
- Cracks inside the tank
- Dirty water entering the underground sump
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
Cracked walls
Shrinkage and settlement cracks let water leak out or seep in.
Pipe entry points
Inlet, outlet and overflow pipes are poorly sealed in most tanks.
Worn internal plaster
Old plaster erodes, exposing porous concrete.
Our method
How RennovEN does it
- 1
Drain & clean
Empty, clean and dry the tank.
- 2
Repair
Treat cracks, honeycombing and pipe entries.
- 3
Coat
Apply a potable-water-safe waterproofing coating.
- 4
Cure & refill
Cure as specified, rinse and refill.
What’s included
- Tank draining and cleaning
- Crack and joint repair
- Pipe entry sealing
- Potable-grade waterproof coating
- Curing and rinse before use
What affects the cost
- Tank size and type
- Access and entry size
- Extent of crack repair
- Coating system
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
Tanks we waterproof are covered against leakage through treated surfaces for 10 years against workmanship defects.
How our warranty worksFAQ
Water Tank Waterproofing: your questions
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