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Mould & Damp Inspection in De Doorns
Mould in De Doorns is usually rising damp in old lime-built stock. A diagnostic inspection establishes which of the three damp mechanisms is at work before you spend anything, because the repairs are completely different and the wrong one is the most common expensive mistake. Expect R1,800 to R4,500 and a written report within 48 hours.
What causes mould in De Doorns
Rising damp in old lime-built stock. The older town stock here was built in lime without a damp-proof course, and much of it has since been repaired with cement plaster and plastic paint that traps the moisture the wall was designed to breathe out. Irrigated agricultural ground raises the local water table around some properties, and hot dry summers followed by frosty winters drive thermal movement that opens paths for water.
Valley-floor stock with cold winters and irrigation-influenced ground moisture.
How to tell which type you have
A tide mark at skirting level with salt bloom at its top edge, worst at the end of winter, and paint lifting in sheets rather than spots.
- Rising damp
- Reads high at the base of the wall and falls with height. Stops at a consistent level, usually with salt crystals at the tide line.
- Penetrating damp
- A patch unrelated to floor level that darkens during and after rain and dries between.
- Condensation
- High surface moisture with a comparatively dry wall behind it. Worst in the coldest corners, behind furniture and around windows — and it occurs in buildings that are not leaking at all.
The pattern is the diagnosis. An inspector takes moisture readings at three heights plus humidity and surface temperature, because each mechanism leaves a different signature — and a thermal camera on its own does not see moisture, only temperature difference.
What it costs to put right in De Doorns
Usually removing the impermeable plaster for a breathable render at R350 to R700 per square metre, plus correcting external ground levels. Injection is the right remedy only where rising damp is genuinely confirmed.
| Item | Indicative range |
|---|---|
| Mould & damp diagnostic inspection | R1,800 – R4,500 |
| Laboratory sample (per sample) | R900 – R2,500 |
| Chemical DPC injection (per linear metre) | R900 – R1,800 |
| Replaster after damp treatment (per m²) | R350 – R700 |
| Roof or balcony waterproofing (per m²) | R250 – R650 |
| Mechanical extraction to a bathroom or kitchen | R2,500 – R8,000 |
Indicative market ranges for guidance, not quotes. Full mould & damp guide →
Also common in De Doorns
- Thermal movement cracking, easily mistaken for foundation failure
- Winter condensation in poorly ventilated rooms during the cold months
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Frequently asked questions
Why does the damp keep coming back in De Doorns?
Almost always because the water source was never found. Painting over mould or sealing the inside of a wall removes the evidence and leaves the cause running. In De Doorns the usual cause is rising damp in old lime-built stock, and until that is dealt with the stain returns.
How much does a mould inspection cost in De Doorns?
Between about R1,800 and R4,500 for a diagnostic inspection with a written report, depending on the size of the property and access. Laboratory sampling, where it is genuinely warranted, adds R900 to R2,500 per sample — but for most homeowners who can already see the mould it adds cost without changing the remedy.
How do I know which type of damp I have?
By the pattern, not the appearance. A tide mark at skirting level with salt bloom at its top edge, worst at the end of winter, and paint lifting in sheets rather than spots. An inspector takes moisture readings at floor, mid-wall and ceiling height, plus humidity and surface temperature, because rising, penetrating and condensation damp each produce a different signature.
What will it cost to fix?
Usually removing the impermeable plaster for a breathable render at R350 to R700 per square metre, plus correcting external ground levels. Injection is the right remedy only where rising damp is genuinely confirmed.
Is the mould in my home dangerous?
Indoor damp and mould are associated with respiratory symptoms, asthma exacerbation and allergic rhinitis, and the risk is higher for children, elderly occupants and anyone with asthma or a weakened immune system. It warrants prompt repair of the water source rather than alarm — and South Africa has no statutory indoor mould exposure limit, so be wary of anyone whose first recommendation is a laboratory test.
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Full home inspection in De Doorns → · The complete guide to mould & damp →