Wall waterproofing Cape Town stops rain getting through external walls. It is preventative work on the outside face, as opposed to treating moisture already inside the structure.
Where damp is already present, the diagnosis comes first under damp proofing. The full range of services sits under Waterproofing Cape Town.
Note which elevation is affected and whether the damp worsens after rain. That distinguishes rain penetration from rising damp.
Get a Wall Waterproofing QuoteHow Rain Gets Through a Wall
- Cracked plaster. Even hairline cracks admit driven rain, which then sits behind the render.
- Porous masonry. Some face brick and older stock absorbs water freely across the whole face.
- Failed mortar joints. Eroded or cracked pointing is the most common path into face brickwork.
- Blown render. Plaster that has lost its bond holds water in the gap behind it.
- Parapets and copings. Water entering the top of a wall runs down inside it, bypassing everything.
- Around openings. Failed sealant at window and door frames.
- Discharging gutters. Water repeatedly saturating one section of wall. See gutter repairs.
Wall Coating Systems
| System | Where it is used |
|---|---|
| Elastomeric acrylic coating | Flexible, bridges hairline cracks, breathable. The general-purpose choice on plastered walls. |
| Clear penetrating repellent | Soaks into face brick and stone without changing appearance. Does not bridge cracks. |
| Textured or membrane coating | Thicker build for walls with more movement or surface irregularity. |
| Cementitious slurry | For retaining walls, planters and permanently damp masonry. |
| Crack bridging with fabric | Reinforcing tape or fabric over live cracks before the coating goes on. |
Preparation Matters More Than the Coating
- Wash down and remove loose or flaking material.
- Tap the render to find blown areas and cut them out.
- Route out and fill cracks, reinforcing live ones with fabric.
- Re-point failed mortar joints on face brick.
- Reseal around window and door frames.
- Check parapet copings and cap them properly.
- Prime, then coat at the specified thickness and coat count.
Coating a wall with unrepaired cracks moves the problem rather than solving it. Water still enters through the crack, and now it cannot dry outwards through the coating either.
Wall Waterproofing Cape Town Prices
| Job | Indicative range | What moves it |
|---|---|---|
| Exterior wall coating, prepared | R90 – R220 per m² | System and coat count. |
| Clear penetrating repellent on face brick | R70 – R160 per m² | Absorption rate. |
| Crack repair | R150 – R450 per linear metre | Width, depth and reinforcement. |
| Cutting out and replacing blown plaster | R280 – R600 per m² | Area and finish. |
| Re-pointing brickwork | R180 – R400 per m² | Raking out and re-jointing. |
| Parapet capping and sealing | R350 – R850 per linear metre | Coping type and access. |
| Resealing around openings | R120 – R280 per linear metre | Sealant type. |
| Typical single elevation, house | R8,000 – R25,000 | Preparation, repairs and coating. |
These are indicative market ranges, not a quotation. They are compiled from published South African waterproofing and roofing pricing to give you a starting point for budgeting. They are not the rate card of any company on this platform.
Compare quotes on the system specified, the number of coats, what preparation is included and what the guarantee covers. A rate per square metre means nothing until you know what the rate covers.
If only one elevation is affected, say which direction it faces. Driven rain has a direction and it narrows the diagnosis.
Get a Wall Waterproofing QuoteCape Town Walls and Driven Rain
Wind-driven rain is the local mechanism. Winter fronts push water horizontally into walls that would shed vertical rain without difficulty, which is why the exposed elevation is usually the only one with a damp problem.
Coastal properties along the Atlantic Seaboard, Blouberg and the Helderberg add salt loading, which stays in the masonry and keeps it drawing moisture from the air. Salt-loaded walls need breathable systems; sealing them tight makes the salt problem worse rather than better.
Older solid-wall housing in the City Bowl and inner Southern Suburbs has no cavity, so anything that gets through the outer face reaches the inside. On those buildings external protection is the whole defence.
Related Services
Frequently Asked Questions
How much does wall waterproofing cost in Cape Town?
A prepared and coated exterior wall generally runs R90 to R220 per square metre. Crack repair adds R150 to R450 per linear metre, and re-pointing brickwork R180 to R400 per square metre.
How do I know rain is coming through my walls?
Damp patches that appear or worsen within hours of rain, usually on one elevation and at any height. Damp that stays constant regardless of weather, at a level line near the floor, is rising damp instead.
Will painting the wall stop damp?
Ordinary paint will not. It sits on the surface and does not bridge cracks or fill porous masonry. A specified waterproof coating over prepared and repaired masonry will, provided the cracks were dealt with first.
Should a wall coating be breathable?
Generally yes. A coating that stops liquid water entering but lets vapour escape allows the wall to dry outwards. A fully vapour-tight coating on a damp wall traps moisture and blisters.
Can face brick be waterproofed?
Yes, with a clear penetrating water repellent that soaks into the brick without changing its appearance. Failed mortar joints have to be re-pointed first, since that is usually where the water is actually getting in.
How long does a wall waterproof coating last?
Typically 7 to 12 years for a good elastomeric system on properly prepared masonry. Clear penetrating repellents on face brick generally need reapplication every 5 to 10 years.
Which walls are most at risk?
The exposed elevations that take driven rain, plus any wall with cracked plaster, failed pointing or a discharging gutter above it. Parapets and free-standing walls get wet from both sides and above, so they weather faster than anything else.
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