Food-grade lining vs Standard coating
A food-grade lining carries current certification for contact with drinking water. A standard waterproofing coating does not, regardless of how well it performs technically. For a potable tank this is a health requirement, not a specification preference.
The differences that actually decide it
| Criterion | Food-grade lining | Standard coating |
|---|---|---|
| Potable water certified | Yes, documented | No |
| Suitable for drinking water | Yes | No |
| Technical performance | Comparable | Comparable |
| Cure and flushing regime | Strict, documented | Standard |
| Documentation at handover | Certificate supplied | Datasheet only |
| Relative cost | Higher | Lower |
Which one, and when
Choose Food-grade lining
- Any tank storing drinking water — overhead or underground
- Society and building potable storage
- Hospital and institutional water storage
Choose Standard coating
- Non-potable storage — firefighting, flushing, process water
- External tank faces and supporting structure
What goes wrong most often
Using a standard coating inside a drinking-water tank because it performs the same and costs less. It does perform the same technically. It is also not certified for contact with water people drink.
Other decisions worth getting right
- APP membrane vs SBS membrane
Both are modified bitumen sheets applied by torch.
- Brick bat coba vs Torch-on membrane
Coba is a thick cementitious build-up that creates the fall, insulates the slab and forms the barrier all at once.
- Polyurea vs Polyurethane coating
Polyurea is spray-applied with heated plural-component equipment and gels in seconds, giving a seamless high-build film that can be walked on within the hour.
- PU injection vs Epoxy injection
The deciding question is whether the crack is moving and whether it is wet.
- HDPE membrane vs Bentonite
Both are pre-applied below-grade systems.
- Cementitious coating vs Liquid membrane
Cementitious coatings are rigid, breathable and bond well to damp concrete — which is why they suit tanks and internal tanking.
- China mosaic vs Shahabad ladi
Both are protective finishes laid over a completed terrace waterproofing layer — neither is a barrier in itself.
- Positive side (external) vs Negative side (internal)
Positive-side waterproofing sits on the face the water arrives from, so water pressure pushes it against the structure.
- Crystalline vs Surface coating
Crystalline systems penetrate concrete and grow crystals inside its capillaries, becoming part of the concrete.
Food-grade lining vs Standard coating — questions we get asked
Food-grade lining or Standard coating — which is better?
Neither, in the abstract. A food-grade lining carries current certification for contact with drinking water. A standard waterproofing coating does not, regardless of how well it performs technically. For a potable tank this is a health requirement, not a specification preference. The decision is made by the duty the system has to perform, not by which product has the better datasheet.
When should I choose Food-grade lining?
Any tank storing drinking water — overhead or underground. Society and building potable storage. Hospital and institutional water storage.
When should I choose Standard coating?
Non-potable storage — firefighting, flushing, process water. External tank faces and supporting structure.
What is the most common mistake people make here?
Using a standard coating inside a drinking-water tank because it performs the same and costs less. It does perform the same technically. It is also not certified for contact with water people drink.
Not sure which your building needs?
That is what the inspection is for. An engineer looks at the actual substrate, exposure and movement, then tells you which system fits and why the other one does not.
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