Factory waterproofing Cape Town covers industrial roofs where production continues below and the roof itself carries extraction, ducting and process plant.
Storage buildings without plant are simpler and sit under warehouse waterproofing. Systems are under Waterproofing Cape Town.
Send the area involved and photos of the surface as it stands. That is usually enough to price it.
Get a QuoteWhat Makes Factory Roofs Harder
- Extraction and ducting. Dense penetrations, each one a separate detail and a separate failure point.
- Process heat. Roof areas above ovens and plant run hotter, ageing coatings faster than the rest.
- Chemical exposure. Extract discharge can attack coatings, so compatibility matters more than usual.
- Hot works restrictions. Torch-on may be prohibited near flammable process material or dust.
- Continuous operation. Shutdown windows are short and often the only time work can happen.
- Condensation. Warm humid air inside a cold sheet roof, which reads as a leak but is a ventilation issue.
Hot Works and Alternatives
Where an open flame is not acceptable, self-adhesive membranes and liquid systems do the same job without the ignition risk. A contractor proposing torch-on in a dust-laden or solvent-present environment has not asked the right questions.
Where torch-on is used, expect a hot work permit, a fire watch during and after application, and isolation of nearby extraction.
Factory Waterproofing Cape Town Prices
| Job | Indicative range | What moves it |
|---|---|---|
| Sheet roof coating system | R120 – R280 per m² | Including fastener replacement. |
| Penetration or collar detailing | R650 – R1,800 each | Number and type. |
| Surface preparation | R20 – R100 per m² | Cleaning, crack filling, priming. |
| Box gutter re-lining | R650 – R1,400 per linear metre | Membrane or GRP lining. |
| Leak trace and inspection | R750 – R2,500 | Area, access and testing time. |
| Flashing replacement | R250 – R600 per linear metre | Material and detailing. |
| Access equipment | R2,500 – R15,000 | Height, duration and permits. |
| Condition survey and report | R4,500 – R25,000 | Building size and detail. |
| Commercial project | From R25,000 | Scoped on area and access. |
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.
Compare quotes on what is included, not on the total alone.
Request QuotesCondensation or Leak
| Symptom | Likely cause |
|---|---|
| Drips without rain | Condensation on the cold underside of sheeting. A ventilation and insulation issue. |
| Drips only during rain | A genuine leak. Trace before anything is coated. |
| Worse in cold weather | Condensation, since the temperature difference across the sheet is greater. |
| Worse in wind | A leak at laps or flashings, driven rain forced back up the overlap. |
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Frequently Asked Questions
Can torch-on be used on a factory roof?
Not everywhere. Where there is flammable process material, solvent vapour or combustible dust, an open flame is unacceptable and a self-adhesive or liquid system is the correct specification.
My factory roof drips when it is cold but not raining. Why?
That is condensation forming on the cold underside of the sheeting, not a leak. It is a ventilation and insulation problem, and coating the top surface will not change it.
How long does waterproofing last?
A correctly installed torch-on system generally gives 10 to 15 years. Liquid acrylic runs shorter, often 5 to 8. Both assume outlets are kept clear and the surface is checked once a year.
When should waterproofing be booked in Cape Town?
Late summer or autumn. Membranes and coatings need a dry substrate and a dry curing window, and contractors fill up as soon as the first winter fronts arrive.
Can waterproofing be applied over the existing coating?
Only where the existing layer is sound, dry and compatible. Coating over a blistered or delaminating membrane traps moisture underneath and the new work fails early.
What should the quote specify?
The measured area, the system and product by name, the number of coats or layers, the preparation included, how upstands and outlets are detailed, access equipment, the guarantee term and the exclusions.
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