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 · SE21, SE22, SE24
Basement waterproofing in Dulwich.
The Effra and its tributaries were culverted beneath Dulwich in the nineteenth century, and they still shape where water goes. Properties on the old watercourse lines see ingress that neighbouring streets simply do not, which is why a blanket specification across the area is a poor idea.
Ground conditions
What sits beneath Dulwich.
| Postcodes | SE21, SE22, SE24 |
|---|---|
| Geology | London Clay, with localised sand and gravel horizons |
| Groundwater | Moderate, influenced by the culverted tributaries of the Effra |
| Housing stock | Large Victorian villas, Edwardian family houses, Georgian survivals in the Village |
The large Victorian villas here have generous footprints and often good existing head height — some of the most rewarding full conversions we do.
Dulwich is one of the areas we cover across South London.
Specification
Choosing the right system for Dulwich.
BS 8102 sets out three forms of protection. Which one suits a property in Dulwich 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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Book a survey in Dulwich.
Tell us what you're seeing and we'll tell you honestly whether it needs a full waterproofing system or something much simpler.