What we get called out to here
- Failed original damp-proof courses. The Victorian and Edwardian stock through Observatory, Woodstock, Salt River, Mowbray and Wynberg was built with slate or bitumen DPCs. Those have had a century to fail, and many have. This is the one part of Cape Town where rising damp is routinely the real diagnosis rather than a misdiagnosis.
- Rainfall. Newlands and Bishopscourt take substantially more rain than the City Bowl or the West Coast. Roof details that survive elsewhere in the metro fail here, and they fail sooner.
- A high water table. Through the lower-lying parts of the corridor, ground water sits close to the surface and loads foundations and retaining walls. Often the correct first move is drainage, not waterproofing.
- Mature tree roots. The oaks the area is known for lift paving, crack boundary walls and block drainage runs.
- Solid walls with no cavity. Older construction here has no cavity to stop water crossing, so any breach in the external plaster shows up inside.
Heritage properties
A great deal of the older stock in this corridor is either formally protected or sits in a heritage overlay. That constrains what can be done to a façade, and it also matters technically: lime-plastered solid walls need to breathe. Sealing one with a modern non-breathable coating traps moisture in a wall that was designed to release it, and the plaster fails.
On those buildings we specify breathable silane repellents and lime-compatible renders rather than the acrylic systems that would be fine on a 1980s house in Durbanville.
Waterproofing contractors covering the Southern Suburbs
Heritage constraints and solid-wall construction rule out a lot of what a general waterproofing company would reach for by default, so it is worth asking any contractor quoting here whether the specification is breathable before you accept it. The rest of what a quote should contain is under choosing a waterproofing contractor.
Areas covered
Claremont, Rondebosch, Newlands, Kenilworth, Wynberg, Constantia, Bishopscourt, Plumstead, Diep River, Tokai, Bergvliet, Observatory, Mowbray, Rosebank, Woodstock and Salt River.
Related services
- damp proofing in Cape Town
- waterproofing prices
- choosing a waterproofing contractor
- a free inspection
- contact us
Common questions
Is rising damp more common in the Southern Suburbs?
Genuinely, yes — and it is the only part of Cape Town where we would say that. The combination of pre-1930s solid-wall construction with original slate or bitumen DPCs, high rainfall and a shallow water table produces real rising damp far more often than elsewhere in the metro.
Can you work on a heritage-protected house?
Yes, with breathable, reversible specifications. Note that alterations to protected structures may require Heritage Western Cape approval — that is the owner's application to make, and we will tell you when we think the work crosses that line.