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 · SM1, SM2
Basement waterproofing in Sutton.
Sutton sits at the head of the River Wandle, where springs once rose under artesian pressure strong enough to drive mills. Abstraction has lowered the water table considerably since then, but it has been recovering for decades — and basements dug when groundwater was low are increasingly finding it again.
Ground conditions
What sits beneath Sutton.
| Postcodes | SM1, SM2 |
|---|---|
| Geology | Chalk, with Thanet Sand to the north |
| Groundwater | Historic artesian conditions near the Wandle headwaters |
| Housing stock | Victorian terraces, Edwardian villas, extensive 1930s suburbs |
We see a lot of 1980s and 1990s cellar conversions in Sutton that were tanked when the water table was lower and are now failing. Retrofitting Type C protection over a failed Type A system is routine work for us.
Sutton is one of the areas we cover across South London.
Specification
Choosing the right system for Sutton.
BS 8102 sets out three forms of protection. Which one suits a property in Sutton 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.
Request a quote
Book a survey in Sutton.
Tell us what you're seeing and we'll tell you honestly whether it needs a full waterproofing system or something much simpler.