Box type vs Conventional treatment
Box type wraps the entire below-grade structure in one continuous barrier — under the raft, up every wall, sealed at the top. Conventional remedial treatment addresses the leaks you can find from inside. Where there is permanent hydrostatic pressure, only one of the two is a system rather than a series of repairs.
The differences that actually decide it
| Criterion | Box type | Conventional treatment |
|---|---|---|
| Continuity | Complete, unbroken envelope | Localised to treated areas |
| When it can be installed | New construction only | Any time |
| Handles permanent head | Yes | Partially |
| Keeps the concrete dry | Yes | No |
| Re-accessible later | No — buried for life | Yes |
| Critical detail | The raft-to-wall membrane lap | Injection coverage of active paths |
Which one, and when
Choose Box type
- New basements below the water table
- Coastal and reclaimed ground
- Where the basement must be reliably dry for its design life
Choose Conventional treatment
- Existing basements that cannot be excavated
- Localised ingress in an otherwise sound structure
- Budget-constrained remedial work
What goes wrong most often
Assuming a conventional internal treatment will match a box system on a high water table. It manages the symptoms while the structure stays saturated, and the reinforcement keeps corroding out of sight.
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.
Box type vs Conventional treatment — questions we get asked
Box type or Conventional treatment — which is better?
Neither, in the abstract. Box type wraps the entire below-grade structure in one continuous barrier — under the raft, up every wall, sealed at the top. Conventional remedial treatment addresses the leaks you can find from inside. Where there is permanent hydrostatic pressure, only one of the two is a system rather than a series of repairs. The decision is made by the duty the system has to perform, not by which product has the better datasheet.
When should I choose Box type?
New basements below the water table. Coastal and reclaimed ground. Where the basement must be reliably dry for its design life.
When should I choose Conventional treatment?
Existing basements that cannot be excavated. Localised ingress in an otherwise sound structure. Budget-constrained remedial work.
What is the most common mistake people make here?
Assuming a conventional internal treatment will match a box system on a high water table. It manages the symptoms while the structure stays saturated, and the reinforcement keeps corroding out of sight.
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.
Mon–Fri 08:00–18:00 · Sat 09:00–16:00 · Jogeshwari West