Type A
Barrier protection
Cementitious slurries and spray applied membranes, forming a continuous barrier against the structure. Suitable where the structure is sound and the head of water is modest and well understood.
Hand & spray applied
Areas we cover · SW18
Basement waterproofing in Wandsworth.
Wandsworth sits on river terrace gravels that are highly permeable and directly connected to the Thames and the Wandle. Water levels here move with the tide and with rainfall, and any below-ground structure is effectively sitting in a working aquifer. Drained cavity protection with reliable pumping is the only realistic approach.
Ground conditions
What sits beneath Wandsworth.
| Postcodes | SW18 |
|---|---|
| Geology | Kempton Park Gravel over London Clay |
| Groundwater | High, and tidally influenced close to the Thames and the Wandle mouth |
| Housing stock | Victorian and Edwardian terraces, converted industrial buildings |
We design to BS 8102 Grade 3 for habitable conversions in this area as a matter of course. Anything less is not defensible given the water levels involved.
Wandsworth is one of the areas we cover across South London.
Specification
Choosing the right system for Wandsworth.
BS 8102 sets out three forms of protection. Which one suits a property in Wandsworth depends on the water head, the condition of the structure and what you intend to use the space for.
Type B
Structurally integral
Water-resistant concrete construction, with joints and service penetrations designed as part of the structure. Usually the route for new basements and underpinned extensions.
New build & underpinned structures
Type C
Drained protection
Cavity drain membrane, perimeter channel and a pumped discharge. It manages water instead of resisting it, and it remains maintainable — which is why it suits most conversions of existing cellars.
Maintainable · Grade 3 habitable
Nearby
We also work in these areas.
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Tell us what you're seeing and we'll tell you honestly whether it needs a full waterproofing system or something much simpler.