Concrete Roof and Roof Slab Waterproofing
Concrete roof waterproofing succeeds or fails on the slab, not the membrane. Concrete moves, cracks, carries moisture and degrades from the inside out, and a membrane bonded to a slab that is doing any of those things is already on a countdown.
Request a Quote
Tell us what the water is doing. We come out free, find where it is getting in, and quote in writing.
A deposit secures your booking and materials, with the balance due on completion.
Our Process
The slab is assessed before the membrane is chosen: moisture, surface soundness, whether the cracks are still moving, and the parapets.
- 1Free site inspection.
Slab condition, cracks, moisture, surface soundness, and the parapets.
- 2Written quote.
Substrate repair and preparation priced separately from the membrane, with live cracks and detail work identified individually.
- 3The work.
Repairs and preparation first. Torch-on across the field, liquid rubber at every detail, live cracks given a flexible treatment.
- 4Follow-up and guarantee.
Fred phones after the first proper rain. Written, minimum 2-year guarantee.
Why Choose TurboMax
Torch-on on concrete is our core work. Fred quotes and manages every project himself and Thomas runs the second team, so the assessment of your slab is made by the people who will stand behind it.
We are willing to tell you that a slab needs repair before it needs waterproofing, and to quote that separately, even when it makes our number bigger than the quote next to it. Then Fred phones after the first proper rain to confirm it held, and if it has not, we come back at our cost.
Written, minimum 2-year guarantee on the workmanship, with extended guarantees available on request, and a 10-year service guarantee where the work is maintained by us on an agreed cycle.
What Our Customers Say
Verbatim reviews from Google, alongside photographs of concrete roof waterproofing we have actually done. No stock imagery.
Fred is a man of his word. The work they did on our roof was on time and good quality.
Repaired some leaks, redid the waterproofing and sprayed my entire roof with liquid rubber in 2 days at a reasonable price. They also guarantee their work for 2 years.
Run by a hands-on owner who impressed with his honesty and integrity. After the first rains, he contacted me to enquire about the work.
I received an extremely professional and friendly service. I was provided with expert advice throughout the project, which was completed well within time and under budget.
Excellent, professional, well-priced work. And a completely hassle-free process! 6/5. Thanks Fred!
Thank you TurboMax Waterproofing for your service and after service. I can definitely recommend your professional service.
Areas We Serve
Based in Kuils River, covering Greater Cape Town, the northern suburbs, the Helderberg, the Winelands and the Overberg. Each area has its own page for what fails there and why.
Frequently Asked Questions
Straight answers, including the ones that talk us out of a bigger job.
What does concrete roof waterproofing cost?
Slab condition drives it more than size. A sound, clean, simple slab is among the cheapest waterproofing work per square metre. A slab needing an old system stripped, surface preparation, crack detailing, spall repair and parapet work is a much larger job, and most of that cost happens before the membrane. We quote those separately so you can see the split.
There are cracks in my roof slab. Does that mean it needs replacing?
Almost never. What matters is whether the crack is still moving. A shrinkage crack that stopped moving years ago can be filled and covered normally. A live crack that opens and closes with temperature needs a flexible detail that lets it keep moving under the membrane. Identifying which you have is part of the inspection.
Can you waterproof a brand new concrete slab straight away?
Not straight away, no. Fresh concrete holds a lot of moisture and a membrane bonded over it will blister as that moisture tries to escape. It needs time to dry, and how long depends on thickness and weather. We would rather tell you to wait than take a booking and hand you a blistered roof.
Why is the damp along the ceiling next to an outside wall rather than in the middle?
That pattern points at the parapet rather than the slab. Water entering at a cracked coping or an open slab-to-parapet junction runs down inside the wall and shows up at the ceiling line. It gets treated as wall damp from inside the room over and over, because nobody goes up to look at the parapet.
My slab has patches where the concrete is flaking and I can see steel. What is that?
That is the reinforcing steel corroding and expanding, pushing the concrete off. It is a structural repair before it is a waterproofing job, and a membrane over it will not stop it or hold it together. We will identify it and set out what has to happen first rather than covering it.
Related Services
Free inspection, a written quote, and no obligation
Fred will tell you what is actually wrong before there is anything to decide.
Get a Free Quote
Free site inspection, honest diagnosis, written quote.
A deposit secures your booking and materials, with the balance due on completion.