Leaking water tank?
Concrete storage tanks, reservoirs, ponds and pools.
Signs you'll see
- Water level dropping when no water is drawn
- Damp or green growth on the outside of the tank
- Cracks or spalling concrete inside the tank
- Discoloured or dirty water
Why it happens
- Shrinkage cracks in the concrete walls
- Leaking pipe penetrations and wall-floor joints
- Old lining broken down by chlorine and wear
How we fix it
Drain, clean and repair
Empty and pressure-wash the tank, cut out and fill cracks, seal pipe entries.
Potable-water lining
Two coats of cementitious or epoxy lining certified for drinking water.
Cure and test
Cure for the full period, then fill and check levels for 48 hours before use.
Only products certified for potable water should be used inside drinking-water tanks. Check the datasheet before buying.
Products for water tanks & reservoirs
Water Tanks & Reservoirs waterproofing questions
How do I know if my concrete water tank is leaking?
Turn off all outlets and mark the water level. If the level drops over 24 to 48 hours with nothing drawn, the tank is leaking. Damp patches or green growth on the outside walls show roughly where.
Is the waterproofing safe for drinking water tanks?
Only if the product is certified for contact with potable water. Use cementitious or epoxy linings approved for drinking water inside the tank and check the datasheet before buying. Bituminous coatings are for the outside of buried tanks only.
Does the tank have to be emptied to waterproof it?
Yes. The tank is drained, cleaned and dried, cracks and pipe entries are repaired, and the lining is applied and fully cured before the tank is filled and checked for leaks.
Want water tanks & reservoirs done for you?
Book a site survey. We inspect, find the source of the leak and give you a written quote.