Concrete Cistern Waterproofing: Coating or Liner?
A leaking concrete cistern can often be fixed with a liquid-applied coating or a custom liner. The right choice depends on the condition of your concrete.
- Find the real source of the leak first
- Sound concrete: a coating may be enough
- Cracked or aging concrete: a liner is usually safer
No exact measurements needed. Phone photos are fine.
- 5 years in businessHundreds of custom liners supplied
- NSF/ANSI/CAN 61Food-grade liner material
- 10-year warrantyManufacturer coverage, seams included
- Shipped across CanadaDIY or professional install
Coating or liner: which fits your cistern?
Sound concrete
A coating bonds to the existing concrete and is usually the lighter option when there are no major cracks or movement.
Cracked or damaged concrete
A liner acts as an independent barrier inside the tank, suited to older, cracked or hard-to-prepare surfaces.
Signs of a leak
Unexplained drops in water level, damp exterior walls, visible cracks and white powdery deposits inside the tank.
Preparation matters
A membrane bonded to dirty or loose concrete fails early. Empty the tank, remove loose material and photograph walls and cracks.
Three checks before you choose
- Confirm the concrete is sound. Look for movement, crumbling or active leaks.
- Plan for cracks and movement. A rigid coating can re-crack if the structure keeps moving.
- Confirm the product is suitable for drinking water if the cistern is potable. Ask for the certification by name.
Not sure? Send photos and we'll help you decide. See also cistern coatings and custom cistern liners.
From inspection to cure
Inspect the cistern
Prepare the substrate
Prime when required
Apply the membrane
Allow the system to cure
Questions about concrete cistern waterproofing
Can you waterproof a concrete cistern with epoxy?
Some epoxy systems are made for tank and water-storage use. The product must suit the concrete, the tank conditions and the water use.
Is a liner better than a coating?
It depends on the concrete. Coatings bond to the existing surface, while liners are independent barriers suited to older, cracked or difficult surfaces.
Do you work outside Eastern Ontario?
We're based in Eastern Ontario. Contact us about installation and product supply elsewhere in Canada.
Get your cistern quote
Send photos and rough dimensions. We'll recommend a coating or a liner.