Damp Proofing Experts Cape Town

Damp proofing experts Cape Town deals with moisture that has already got into a structure. Damp is not one problem, and treating the wrong one is the reason so many walls are treated twice.

There are three distinct causes, each with its own diagnosis and fix. Surface protection against rain getting in sits under wall waterproofing, and the broader range of services under Waterproofing Cape Town.

Send photos of the damp area, ideally showing the full wall from floor to ceiling, and note whether it worsens after rain.

Get a Damp Proofing Quote

The Three Types of Damp

Type	How it behaves
Rising damp	Groundwater drawn up through masonry by capillary action. Stops at a level tide mark, usually below a metre. Covered in detail under rising damp treatment.
Penetrating damp	Water entering horizontally through a defect: cracked plaster, failed pointing, a leaking gutter, a bridged cavity. Patches follow the defect and worsen in rain.
Condensation	Moisture from inside the building settling on cold surfaces. Worst in corners, behind furniture and around windows, usually with black mould.

Diagnosing Damp

The pattern tells you most of it. Height matters, timing matters, and so does whether the damp is worse on an exposed elevation.

Height. A level line under a metre points to rising damp. Damp at any height points elsewhere.
Timing. Damp that worsens within hours of rain is penetrating. Damp that stays constant is more likely rising.
Location. Cold external corners and window reveals with black mould suggest condensation.
Exposure. Damp only on the south-western elevation usually means driven rain through porous masonry.
Moisture readings. A meter distinguishes surface moisture from a genuinely wet wall, and salt-contaminated plaster from wet plaster.

Penetrating Damp and Its Causes

Cracked or blown external plaster, and failed mortar joints.
Overflowing or leaking gutters saturating the wall below. See gutter repairs.
Failed flashings and abutments where a roof meets a wall.
Ground level or paving built up above the damp-proof course.
Porous face brick on an exposed elevation.
Leaking balconies discharging into the wall below. See balcony waterproofing.

Damp Proofing Solutions

Solution	What it addresses
Chemical damp-proof course	Injected cream or fluid forming a barrier in the mortar course. For rising damp.
Salt-retardant replastering	Contaminated plaster removed and replaced with a specified render. Almost always paired with DPC work.
External crack repair and coating	For penetrating damp through porous or cracked masonry.
Cavity clearing and re-pointing	Where mortar droppings or failed joints are bridging moisture across.
Ground level correction	Lowering paving or soil that sits above the damp-proof course.
Ventilation improvement	For condensation: extraction, airbricks and reducing internal moisture load.

Damp diagnosed correctly is usually cheaper to fix than damp treated twice. Get the survey before the quote.

Get a Damp Assessment Quote

Damp Proofing Experts Cape Town Prices

Job	Indicative range	What moves it
Damp survey with moisture readings	R750 – R2,500	Property size and report detail.
Chemical damp-proof course injection	R450 – R900 per linear metre	Wall thickness and access.
Salt-retardant replastering	R300 – R650 per m²	Strip, render and finish.
External crack repair	R150 – R450 per linear metre	Depth and preparation.
Exterior wall waterproof coating	R90 – R220 per m²	Prepared and coated.
Re-pointing brickwork	R180 – R400 per m²	Raking out and re-jointing.
Single damp wall, typical treatment	R6,000 – R18,000	Injection plus replastering.

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.

Damp in Cape Town Housing

Older solid-wall stock across the City Bowl, Woodstock, Observatory and the older Southern Suburbs was often built without a damp-proof course, or with one that has since been bridged by later paving and additions. That combination produces most of the genuine rising damp cases seen locally.

Penetrating damp is more common on the exposed south-western elevations, where winter fronts drive rain horizontally into walls that would shed vertical rain without difficulty. Coastal properties add salt loading, which keeps masonry hygroscopic long after the water source is gone.

Related Services

Rising Damp Treatment Cape TownMoisture rising through masonry.Wall Waterproofing Cape TownKeeping rain out of the wall.Basement Waterproofing Cape TownBelow-ground water pressure.Gutter Repairs Cape TownA frequent cause of wall damp.Waterproofing Cape TownThe full range of services.

Frequently Asked Questions

How much does damp proofing cost in Cape Town?

A damp survey runs roughly R750 to R2,500. Treatment depends on the diagnosis: injected damp-proof course work is around R450 to R900 per linear metre, and salt-retardant replastering R300 to R650 per square metre. Penetrating damp is often cheaper to fix because it is usually an external defect.

How do I know what kind of damp I have?

Rising damp stops at a fairly level tide mark, usually under a metre, and is worst at the base of the wall. Penetrating damp appears as patches that track a defect and worsen during rain. Condensation shows on cold surfaces and in corners, and is usually accompanied by black mould.

Can damp be fixed permanently?

The cause can be fixed permanently. The wall then needs time to dry, which can take months for thick masonry, and replastering usually forms part of the work because salts left behind will keep drawing moisture.

Why does damp keep coming back after painting?

Because paint is not a treatment. Sealing the inside face of a damp wall traps moisture behind the coating, which then blisters and pushes the damp higher or wider. The cause has to be addressed before decorating.

Does damp proofing need the plaster removed?

Usually yes for rising damp, because contaminated plaster holds hygroscopic salts and will stay damp even after the source is stopped. Penetrating damp often does not need it if the plaster is otherwise sound.

Is damp covered by insurance?

Generally not. Damp is treated as a maintenance issue rather than sudden damage. A burst pipe causing damp is a different matter and may be covered.

How long does a wall take to dry out?

Roughly a month per 25 mm of wall thickness once the source is stopped, which puts a solid double-brick wall at several months. Heating and ventilation speed it up, sealing it in does not.