Exterior Wall Waterproofing in George
Wall damp and wall water ingress are different problems with different fixes, and coating a wall that has rising damp makes it worse by trapping moisture in the masonry. So we diagnose first: where the water is coming from, which elevation is taking it, and whether the wall needs a coating, a damp-proof course, a repair at the parapet, or nothing at all.
✓ Diagnosis Before Quote ✓ Breathable Systems ✓ Coastal Exposure Specified ✓ Free Site Inspection
What We Do
Diagnosis first, then the system that actually matches the mechanism — because coating a wall with rising damp makes it worse.
Driven Rain & Wall Coatings
Breathable elastomeric and acrylic systems on exposed elevations, over properly prepared and primed plaster with cracks cut out and filled first.
Damp Diagnosis
Rising damp, penetrating damp and condensation present differently and need different fixes. We establish which one you have before quoting a system.
Parapets, Copings & Junctions
Where wall waterproofing actually fails. Re-capping, coping joints, proper flashings and the sill and reveal details that let water in.
How It Works
- Site inspection and diagnosis. Damp pattern, external ground and paving levels against the DPC, gutters and downpipes, moisture readings at several heights and both faces.
- Rule out the cheap answers. A paving level bridging the damp course, or a leaking downpipe, resolves a surprising number of damp walls with no coating at all.
- System recommendation. Breathable coating where the wall is taking driven rain, a damp-proof course where it is rising damp, tanking or cavity drain below ground.
- Preparation. Hollow plaster cut out and made good, cracks routed and filled, biological growth treated, surface cleaned back to sound material and primed.
- Application and maintenance plan. System applied to specification, then a written note on the 5 to 8 year recoat cycle and the annual check that keeps it working.
Should you waterproof an exterior wall at all?
Not every exterior wall needs it, and blanket-coating a house is a waste of money at best and actively harmful at worst.
The walls that genuinely need treating are the ones actually taking water: a west or south-facing elevation exposed to driven rain, a parapet, a wall with failed or cracked plaster, or a wall showing damp on the inside face after a front.
The walls that do not are the sheltered elevations, and — importantly — any wall whose damp problem is rising damp rather than penetrating damp. Sealing the outside face of a wall with rising damp does not stop water entering from below; it stops the wall drying out, and the moisture goes further up and further in instead.
This is the single most common mistake we are called to correct on wall damp, and it is expensive to undo because the coating has to come off before anything can be fixed.
So the first job on any damp wall is diagnosis, and it usually takes a site visit and sometimes a moisture survey rather than a look from the street.
| Problem | What it looks like | Correct fix | What makes it worse |
|---|---|---|---|
| Driven rain penetration | Damp inside after wind-driven rain, on one elevation | Breathable elastomeric or acrylic coating over prepared, primed plaster; cracks cut out first | Nothing — this is the case coatings are for |
| Rising damp | Tide mark to about a metre, salting, plaster blowing at the base | Damp-proof course, and correct the external ground and paving levels | Coating the wall — it traps moisture in the masonry |
| Below-ground water | Damp on a retained or basement wall | Tanking or a cavity drain system | Painting the inside face |
| Parapet and coping failure | Damp at the top of a wall, or below a parapet | Re-cap, seal the coping joints, form a proper flashing | Sealant over a moving joint |
| Cracked plaster | Fine or structural cracking, damp tracking behind | Cut out, fill, then coat; investigate structural cracks first | Coating straight over a live crack |
Telling driven rain from rising damp
The two present differently, and the pattern is usually readable once you know what to look at.
Rising damp shows as a broadly horizontal tide mark, typically up to somewhere around a metre from floor level, worse in winter, often with salt deposits on the surface and plaster blowing or crumbling at the base. It is caused by capillary moisture drawn up out of the ground where there is no damp-proof course, where the DPC has been bridged by raised paving or a flower bed outside, or where plaster has been carried down across it.
Penetrating damp follows the weather rather than the floor line. It appears after driving rain, it concentrates on the exposed elevation, and the damp patch is often at height rather than at the base. It tracks cracks, failed pointing, a defective sill or a parapet above.
Condensation is the third possibility and it is frequently misdiagnosed as either of the others. It shows on cold surfaces and in corners, in poorly ventilated rooms, usually with black mould rather than salting, and no amount of external waterproofing will touch it.
The fixes are entirely different: a DPC for the first, a coating or a repair for the second, ventilation and heating for the third. Which is why anybody quoting a wall coating before establishing which one you have is guessing with your money.
What we actually apply, and on what
Where a coating is the right answer, the system matters and so does the preparation.
Breathability is the key property. An external wall coating needs to shed liquid water while still letting water vapour out of the masonry. A fully impermeable coating on a wall that carries any moisture at all will blister, and it will hold that moisture in the wall behind it. Elastomeric and high-quality acrylic systems designed for masonry do this properly; general-purpose paint and non-breathable membranes do not.
Crack-bridging matters on any wall that moves — which is most of them. Fine cracking in plaster is normal, and a coating with elongation will span it. Structural cracking is a different matter and needs investigating before anything is applied over it.
Preparation is most of the job. Loose and hollow plaster cut out and made good, cracks routed and filled, surface cleaned back to sound material, biological growth treated, and a primer suited to the substrate. Almost every failed wall coating we are asked to look at failed at this stage rather than in the product.
Below ground is a different system entirely. A retained or basement wall needs tanking or a cavity drain arrangement, not a coating on the inside face. Water under hydrostatic pressure will find its way through a paint film.
On products, we specify from the established construction chemicals ranges — Sika, a.b.e., Mapei and Fosroc all carry facade systems where the primer, the crack bridging layer and the topcoat are designed to work together. The choice between a breathable silicone or siloxane water repellent, an elastomeric coating and a full render system is made from what the wall is doing, not from what is on a merchant shelf. A wall that needs to breathe and gets a sealed film coating will blister, and no brand prevents that.
Coastal exposure, and how long it lasts
Plan on 5 to 8 years between recoats, with annual maintenance checks in between. That is our number for the Garden Route and we would rather give it to you than a laboratory figure.
Salt-laden air, UV and the wind-driven rain that comes with a southeaster are all harder on an external coating here than inland conditions are, and the exposed elevations wear faster than the sheltered ones. A coating that is inspected and refreshed on cycle keeps the wall dry indefinitely; one that is applied and forgotten fails somewhere around year six, usually starting at the parapet or a sill.
The annual check is quick: look at the exposed elevations, at the copings and sills, at any crack that has reopened, and at the ground and paving levels outside — because a paving level that has crept up over the DPC will create a rising damp problem on a wall that never had one.
Refreshing a sound coating before it fails costs a fraction of stripping a failed one and drying out the masonry behind it.
Common Questions
Should you waterproof exterior walls?
Only where the wall is actually taking water — a west or south-facing elevation exposed to driven rain, a parapet, or a wall showing damp on the inside face. Blanket-coating every exterior wall is unnecessary, and on a wall with rising damp it makes things worse by trapping moisture in the masonry. Wall damp and wall water ingress are different problems with different fixes, which is why we diagnose before quoting.
How do you waterproof a wall in South Africa?
Above ground, with a breathable elastomeric or acrylic coating over properly prepared and primed plaster, with cracks cut out and filled first. Below ground, with tanking or a cavity drain system. For rising damp, with a damp-proof course — not a coating. Getting that choice wrong is the single most common waterproofing mistake we see on walls, and it is expensive to undo because the wrong coating has to come off first.
What is the best waterproofing for exterior walls?
A breathable system: one that sheds liquid water while letting water vapour out of the masonry. Elastomeric and quality acrylic masonry coatings do this and bridge fine cracks as the wall moves. What does not work is a fully impermeable film — it blisters, and it holds moisture in the wall behind it. Beyond the product, the preparation decides the outcome: hollow plaster cut out, cracks routed and filled, surface clean and sound, correct primer.
How do I know if it is rising damp or a leak?
Rising damp shows as a roughly horizontal tide mark up to about a metre from floor level, worse in winter, often with salting and plaster blowing at the base. Penetrating damp follows the weather instead — it appears after driving rain, concentrates on the exposed elevation, and often shows at height rather than at the base. Condensation is the third possibility, showing on cold surfaces and in corners with black mould rather than salting. The three have entirely different fixes.
Can you waterproof a wall from the inside?
For above-ground penetrating damp, treating the inside is dealing with the symptom — the water is still entering the masonry and the internal treatment just moves where it appears. For below-ground walls, internal systems do have a legitimate role: a cavity drain membrane on the inside face manages water rather than trying to resist it, and it is often the only practical option where the outside cannot be excavated. Which one applies depends entirely on what the wall is doing.
How long does exterior wall waterproofing last?
Plan on 5 to 8 years between recoats with annual maintenance checks in between. Coastal salt air, UV and driven rain are harder on a coating here than inland, and the exposed elevations wear faster than the sheltered ones. Inspected and refreshed on cycle it keeps working indefinitely; left alone it fails somewhere around year six, usually starting at a coping or a sill.
Will waterproofing a wall stop damp inside the house?
It will if the damp is penetrating damp on that wall. It will not if the cause is rising damp, a plumbing leak, a roof or parapet defect above, or condensation — and in the case of rising damp it will make matters worse. That is why the first visit is a diagnosis rather than a quote: identifying the mechanism is the part that determines whether the money you spend actually fixes anything.
We Serve George and the Surrounding Towns
Based in George, waterproofing exterior walls, parapets and damp-affected masonry the length of the Garden Route.
George · Wilderness · Mossel Bay · Great Brak River · Glentana · Herolds Bay · Sedgefield · Knysna · Plettenberg Bay · Hartenbos · Oudtshoorn · Riversdale
Damp wall you cannot get to the bottom of?
We diagnose the mechanism before we quote a system. If the answer is a damp-proof course rather than a coating, or ventilation rather than either, we will tell you that instead of selling you paint.
Or call us directly on 073 160 7619 — Mon–Fri 7am–5pm
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