Food-Grade Tank & Reservoir Lining

A tank that holds drinking water is a different problem from a tank that holds rainwater or grey water. The waterproofing has to stop the leak and also be safe in contact with water people will drink — and those two requirements are not automatically met by the same product.

The starting point is the current approval: the product must be certified for potable water in the market where it is installed, at the thickness and curing schedule the manufacturer specifies. An approval for a similar product, or a general-purpose coating, is not a substitute.

Surface preparation matters more here than on a decorative coating. The substrate has to be clean, sound and free of old coatings, and any repair mortar has to be compatible with the lining. Contamination, dust and curing compounds can compromise adhesion and, in a potable tank, the water itself.

Application and cure are part of the safety case. The lining has to reach full cure and be flushed or cleaned as the manufacturer directs before the tank is returned to service. Testing and, where required, a water sample give the owner a record that the work was done properly.

We specify potable-water systems against the current technical data sheet and local requirements, and we do not substitute a product because it is cheaper or faster. If the correct system is not available, we say so rather than lining the tank with something that is not approved.