In a warehouse the roof is the risk. A sheet roof is mostly laps and fixings, and what sits underneath is stock that insurance values properly only if you can show the cause.
For process and plant water see industrial leak detection. Wider scope at Leak Detection Johannesburg.
Tell us the roof area, the sheet type, and whether stock is affected.
Get a Warehouse Leak QuoteWhere Warehouse Roofs Fail
- Screw and washer failures across thousands of fixings, the single most common entry point.
- End and side laps that shed vertical rain but not a driven Highveld thunderstorm.
- Hail damage and cut-edge corrosion, where broken coating on an older industrial roof lets rust start at the damage.
- Valley gutters and downpipes blocked with debris, backing water up over the sheet.
- Penetrations for extraction, skylights and services, where flashing details fail.
- Buried yard reticulation under hardstanding, which shows on the meter rather than the floor.
Protecting the Stock Claim
Photograph the water ingress, the affected pallets and the racking position before anything is moved. Insurers assess a stock claim on evidence of cause and extent, and a dated roof inspection report identifying a storm-related failure supports it in a way that a repair invoice alone does not.
Warehouse Leak Detection Prices in Johannesburg
| Job | Indicative range | What moves it |
|---|---|---|
| Warehouse leak detection | From R4,750 | Scoped on roof and floor area. |
| Roof inspection and leak trace | R950 – R2,400 | Photographs and marked entry points. |
| Drone survey of a large roof | R1,500 – R3,500 | Where access is unsafe. |
| Controlled hose test | R1,200 – R2,800 | Section by section, elusive leaks. |
| Yard reticulation detection | R1,800 – R3,800 | Correlator survey per run. |
| Sheet refix and lap sealing | R180 – R450 per m² | Hail-damaged sheeting at the top. |
| Flashing and penetration repairs | R1,800 – R6,500 | Per detail. |
| Gutter clearing and re-lining | R2,400 – R8,500 | Valley gutters. |
| Roof waterproofing | R150 – R350 per m² | System and preparation dependent. |
| Report for insurer or landlord | R1,200 – R3,500 | Cause, extent and costed scope. |
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.
On a large sheet roof, ask whether the quote is a repair of the located defect or a recoat of the whole area. The difference between those two numbers is usually an order of magnitude.
Related Services
Frequently Asked Questions
Water only comes in during storms. Where should we look?
At laps, flashings and penetrations rather than the sheet itself. A leak that appears only in driven rain almost always means water is being pushed in at a detail that sheds vertical rain perfectly well.
Who is responsible, us or the landlord?
Most commercial leases put the roof and building structure with the landlord and the tenant's fit-out and stock with the tenant. Check the lease before authorising a roof repair.
Is stock damage covered by insurance?
Sudden storm damage generally is; long-term deterioration and failed maintenance usually are not. Photograph everything before moving stock, and get a dated inspection report identifying the cause.
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