What we get called out to here
- Salt attack on coatings and fixings. Chloride-laden air degrades coatings faster and corrodes fasteners, flashings and balustrade fixings. Systems that give twelve years inland give notably less within a kilometre or two of the water.
- Wind-driven rain on south-west elevations. The single most common damp fault here, and the treatment is under damp proofing in Cape Town. Water is driven through porous plaster and hairline cracks that would never pass water under vertical rain.
- Estate balcony detailing. A great deal of newer Helderberg stock has balconies and planter boxes with thin or absent membranes. Damp on the wall below a balcony is the standard presentation — see balcony waterproofing.
- Sloped sites. Ground water runs downhill through the properties on the mountain side and loads uphill walls. Usually a drainage problem first.
- Retaining walls. Common on the terraced sites, and frequently built without weep holes or a drained backfill, so they hold water against the structure.
Specifying for a coastal site
On a property within a couple of kilometres of the coast we specify differently: UV and chloride-stable membranes, stainless or hot-dip galvanised fixings rather than plated, generous laps at every termination, and breathable repellents on exposed elevations so salt-laden moisture in the wall can still escape.
It costs a little more up front and it is the difference between a system that lasts and one that needs attention in five years.
Waterproofing contractors in Somerset West
We quote Helderberg work on a coastal specification as standard rather than as an upgrade, which is the main practical difference between waterproofing services in Somerset West and the same job twenty kilometres inland. A quote that does not mention fixings or UV stability has been priced as an inland roof.
What a quote should contain is under choosing a waterproofing contractor.
What the south-easter through Sir Lowry's Pass actually does
The pass funnels the summer south-easter into the Helderberg basin and accelerates it. The practical consequence is that rain here does not fall, it arrives horizontally, and it arrives on the same two elevations of every house: south-east and south-west.
- Wind-driven rain finds vertical joints, not horizontal ones. A roof that sheds rain perfectly will still let water in through an unsealed window reveal or a hairline crack on the weather elevation.
- Membrane laps lift. Sustained uplift on a flat roof works at any lap that was laid short. Two-layer torch-on wants 100mm side laps and 150mm end laps; on an exposed Helderberg roof a 50mm lap is a future leak with a date on it.
- Coatings age at the exposure, not at the average. A liquid acrylic quoted on an 8–12 year life inland will not see the top of that range on a south-west elevation 4km from False Bay.
The fix is not a better product. It is detailing the two weather elevations differently from the two sheltered ones, and specifying for the exposure rather than for the address.
What salt actually does to a coating
Salt-laden air is the second load, and it works more slowly and more completely than the wind does.
Airborne salt settles on the surface, dissolves in the next rain or the next morning's dew, migrates into the pores of plaster and coating, and then crystallises as it dries. Sodium chloride expands as it crystallises. Repeat that cycle a few thousand times and the coating is pushed off the substrate from underneath — which is why a coastal failure looks like flaking and blistering rather than cracking.
It also attacks fixings. Galvanised screws and unprotected steel brackets on an exposed Strand or Gordon's Bay roof corrode years earlier than the same fixing in Durbanville, and a corroded fixing is a penetration through the membrane.
Specifying for it means a breathable water-repellent rather than a sealed film on masonry, stainless or hot-dip galvanised fixings on the roof, and a re-coat interval set from the exposure rather than from the product data sheet.
Areas covered
Somerset West, Strand, Gordon's Bay, Sir Lowry's Pass, Firgrove and Croydon. We also take work in the near Overberg — Grabouw, Botrivier and the Elgin valley — where the job is a full roof system or sectional-title work rather than a single callout.
Related services
- balcony and deck waterproofing
- waterproofing prices
- choosing a waterproofing contractor
- a free inspection
- contact us
Common questions
Do you offer waterproofing services in Somerset West and Strand?
Yes — Somerset West, Strand, Gordon's Bay, Firgrove and Croydon are inside our normal service area, so the inspection and written quote are free. Everything in the basin gets specified to a coastal standard: UV- and chloride-stable membranes and stainless or hot-dip galvanised fixings.
Does coastal air really affect waterproofing?
Yes, measurably. Chloride-laden air accelerates degradation of coatings and corrodes fixings, flashings and balustrade fittings. Within roughly two kilometres of the water we specify UV- and chloride-stable systems with stainless fixings as standard.
Why is only one side of my house damp?
Almost always because that elevation faces the prevailing wind-driven rain. In the Helderberg that is typically the south-west face. The rain is arriving sideways, so it enters through plaster and cracks that vertical rain would never reach.