Keep Your Concrete Slab Leak-Free, Rain or Shine
What We Fix with Slab Waterproofing
Cracks in Slabs
Poor Slopes
Water Penetration
Immediate Leak Protection
Long-Term Slab Protection
How we work
1.
Quote
2.
Fix
3.
Guarantee
Subtypes section heading
Methods We Use for Concrete Slab Waterproofing
Why Concrete Slab Waterproofing matters in our climate
Our results speak for themselves
What our clients are saying
"I want to publicly thank the team at ITA CORP for the extremely professional and reliable work they did recently on our patio roof. We've struggled with leaks for years, and now, with ITA CORP on the job, I feel comfortable since Malvern is conscientious, eager to help, knowledgeable, and his communication and follow-up is amazing."
"Itacorp have provided excellent services and quality workmanship throughout the years. Any comeback is dealt with immediately/timeously.
Itacorp takes pride in their workmanship. Recommended."
"Itacorp has helped me a lot with dampness walls, slabs water proofing, as well as storm water drain system that has given me years of problem. knowledge and service is out of this world, thank you Malven Makura.😀"
"I want to extend a big thank you to ITA CORP for the outstanding work they did on my house. From start to finish, their professionalism, attention to detail, and quality of workmanship were exceptional. It’s rare to find a team that delivers exactly what they promise—and they certainly did. Highly recommended for anyone looking for reliable, top-notch service!"
"I have had the pleasure of several dealings with Melvern and his professional team where the work done has always been above & beyond expectations and have no hesitation in referring his company."
"We have had serious issues with water damage that was driving us insane. Malvern’s team waterproofed our bathroom and fixed what another contractors managed to damage."
Get in touch
Why Concrete Slab Waterproofing Is Critical for Johannesburg Properties
Concrete slabs are the backbone of many Johannesburg buildings, yet they’re also one of the most common sources of hidden water damage. When slabs absorb moisture or develop cracks, water finds its way into ceilings, walls, and even electrical conduits below. Over time, this leads to structural deterioration, bubbling paint, mould growth, and costly repairs.
Proper concrete slab waterproofing is about more than sealing the surface. It’s about creating a flexible, watertight system that prevents water penetration while allowing the slab to handle natural expansion and contraction. Every slab reacts differently to weather and structural movement, which is why our approach is fully tailored, built for Johannesburg’s high UV exposure, heavy rains, and temperature shifts.
If the slab connects to a balcony, you may also need our balcony waterproofing services.
Why Our Slab Waterproofing System Outperforms Standard Methods
Most waterproofing failures happen because slabs are coated without addressing slope, surface porosity, or joint movement. Our process starts by solving the cause, not the symptom. We identify where water collects, test for cracks and voids, and prepare the surface so the waterproofing system bonds perfectly.
We use flexible, UV stable membranes, like torch on, liquid rubber, or acrylic coatings, that move with the slab instead of cracking under stress. Fibre reinforced compounds strengthen high risk joints and ensure every surface remains watertight. The result is a seamless waterproof barrier that performs for years, even under Johannesburg’s toughest weather conditions.
Who Benefits from Professional Concrete Slab Waterproofing
Our service is trusted by:
Homeowners with leaking balconies or rooftop slabs that drip into living spaces.
Commercial property owners managing offices, warehouses, or showrooms where slab leaks disrupt operations.
Developers and facility managers responsible for multi storey buildings, parking decks, and suspended slabs.
Architects and contractors who need long term slab protection for new builds or refurbishments.
If you’ve noticed damp patches on ceilings, hairline cracks in slab surfaces, or peeling paint below a flat roof, you’re already seeing the signs of water ingress, and professional waterproofing is the only lasting solution.
For slabs connected to large roof areas, explore our roof waterproofing solutions.
The Hidden Problems We Solve
Leaks that appear long after the rain has stopped
Cracks in slabs caused by movement or settling
Ponding water due to poor slope design
Weak or delaminated coatings that no longer protect
Water seepage damaging ceilings, walls, and wiring below
By addressing structure, slope, and surface condition together, we eliminate the root cause of slab leaks, not just the symptoms.
Long-Term Benefits of Proper Slab Waterproofing
Once a slab is waterproofed correctly, the difference is immediate and long lasting. The surface remains dry, durable, and UV protected, which prevents water damage to both the slab and the structure beneath it. Clients often report that rooms below stay cooler and cleaner, with no more signs of damp or mould.
In addition, proper slab waterproofing extends the life of the entire building. By keeping moisture out, we prevent corrosion in steel reinforcements, reduce maintenance costs, and preserve the property’s value for years.
If water penetration has already caused interior damp issues, you may also need interior damp proofing.
How We Waterproof Concrete Slabs the Right Way
Inspection and Assessment – We locate cracks, weak spots, and drainage issues.
Surface Preparation – Cleaning, grinding, and priming for maximum adhesion.
Crack and Joint Sealing – Flexible fillers and fibre reinforcement for lasting strength.
Waterproofing System Application – Torch on, liquid rubber, or acrylic systems installed depending on slab type and exposure.
UV Resistant Finishing – Coatings applied to protect against Johannesburg’s sun and weather extremes.
Final Testing and Guarantee – We test for watertightness before sign off, with every project covered by a workmanship guarantee.
Frequently Asked Questions
Can you waterproof a slab without removing the old coating?
In many cases, yes. If the existing coating is stable, we can overlay with compatible systems like liquid rubber or fibre seal for added strength and protection.
How long does concrete slab waterproofing last?
Typically 8 to 12 years depending on exposure, with our UV resistant systems performing exceptionally well in Johannesburg’s climate.
What’s the difference between slab and roof waterproofing?
While both protect against leaks, slab waterproofing must handle foot traffic, load stress, and drainage challenges unique to concrete surfaces.
Will waterproofing fix existing leaks?
Yes, our process includes sealing cracks and reinforcing weak joints before applying new waterproofing, eliminating both current and future leaks.
Do you guarantee your slab waterproofing?
Absolutely. Every project includes a workmanship guarantee and material warranty for peace of mind.
If your slab leaks during rain or shows signs of dampness below, don’t wait until the problem spreads. Contact us today for professional concrete slab waterproofing in Johannesburg, built for local conditions, backed by decades of experience, and guaranteed to last.
Service Areas
We provide professional waterproofing and painting services across Johannesburg’s northern suburbs, including Sandton, Sandhurst, Hyde Park, Westcliff, Houghton Estate, Bryanston, Illovo, Dunkeld, Sandown, Morningside, Parktown North, Rosebank, Melrose, Fourways, Steyn City, Hallinghum, Dainfern, and other prime northern areas.