Water enters a roof at one point and appears at another, often several metres away along a batten or a truss.
Sealing the stain is why so many roof repairs fail on the next storm. Related services at Leak Detection Johannesburg.
Tell us the roof type and whether the leak follows wind or only heavy rain.
Get a Roof Leak QuoteWhere Johannesburg Roofs Actually Leak
- Flashings at chimneys, parapets and wall abutments. The single most common entry point.
- Valleys, where debris dams water and pushes it sideways under the tiles.
- Cracked or slipped tiles, and perished ridge bedding.
- Screw and washer failures on IBR and corrugated sheeting, accelerated by hail damage to the coating.
- Failed torch-on membrane at upstands and outlets on flat roofs.
- Wind-driven rain in a Highveld thunderstorm, entering places that never leak in still rain.
How the Entry Point Is Found
Inspection from inside the roof space during or straight after rain, tracing the wet path back up. Where that is inconclusive, a controlled hose test works section by section from the lowest point upward, and thermal imaging maps how far the wet area actually extends.
Roof Leak Detection Prices in Johannesburg
| Job | Indicative range | What moves it |
|---|---|---|
| Roof inspection and leak trace | R450 – R950 | Often credited against the repair. |
| Detailed inspection with report | R950 – R2,400 | Photographs and marked entry points. |
| Controlled hose test | R1,200 – R2,800 | Section by section, for elusive leaks. |
| Thermal survey of the roof space | R1,200 – R2,800 | Maps the true wet extent. |
| Drone survey, high or steep roofs | R1,500 – R3,500 | Where access is unsafe. |
| Roof leak repair once located | R800 – R5,000 | Depends on the defect. |
| Sectional waterproofing | R150 – R350 per m² | Where the membrane has failed. |
These are indicative market ranges, not a quotation. They are compiled from published South African leak detection and plumbing pricing to give you a starting point for budgeting. They are not the rate card of any company on this platform.
A quote written without anyone entering the roof space is a guess. Ask what was inspected and where the water was traced from, not just what it will cost to seal.
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Frequently Asked Questions
Why does my roof only leak in certain rain?
Wind direction. A Highveld thunderstorm drives rain almost horizontally into flashings and laps that shed water perfectly well in vertical rain. A leak that appears only in a storm from one direction is a detail failure, not a roof failure.
Hail is the other Johannesburg factor: it breaks the coating on sheeting and cracks tiles, and the leak only shows in the next heavy rain.
Can a roof leak be found when it is not raining?
Yes, with a controlled hose test working upward in sections, or by inspecting staining patterns and debris in the roof space. It takes longer than catching it in the act.
Should I just waterproof the whole roof?
Not before the leak is traced. Coating over a failed flashing or a cracked tile hides the defect without fixing it, and the coating then fails early because water is trapped underneath.
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