Correct Slopes, Prevent Ponding, Protect Your Property
What We Fix with Slope Correction & Drainage
Ponding Water
Blocked Drainage
Structural Stress
Immediate Water Flow Solutions
Long-Term Structural Protection
How we work
1.
Quote
2.
Fix
3.
Guarantee
Types of Slope & Drainage Work We Do
Methods We Use for Slope & Drainage Workheading
Johannesburg’s rain and sun demand proper drainage solutions.
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 Proper Slope and Drainage Are the Foundation of Every Waterproofing System
No matter how strong a waterproofing layer is, it will fail if water can’t drain properly. Flat roofs, balconies, and concrete slabs in Johannesburg often suffer from poor slope design, water collects in shallow areas, breaks down coatings, and seeps through hairline cracks over time. This is one of the biggest reasons leaks return even after “repairs.”
Slope correction and drainage work is about reshaping the surface so water naturally flows away from the structure instead of sitting and slowly eroding it. It’s not cosmetic, it’s structural protection. When done correctly, it prevents leaks, mould, damp ceilings, and costly structural repairs for years to come.
For areas where slope issues cause recurring balcony leaks, see our balcony waterproofing services.
Why Our Slope Correction Method Works
Most contractors overlook slope issues when waterproofing, patching leaks instead of fixing the cause. We take the opposite approach. Our process starts by mapping how water currently flows, or fails to flow, across your surface. From there, we design a slope system that redirects water to properly placed outlets.
We use high strength screed or lightweight fillers to rebuild gradients and combine that with seamless waterproofing membranes to lock in protection. Each surface is finished with UV resistant coatings to ensure it lasts through Johannesburg’s sun and storm cycles.
The result is a perfectly balanced surface that drains efficiently and stays watertight year round.
Who Needs Professional Slope Correction and Drainage
Our slope correction and drainage services are ideal for:
Homeowners with leaking flat roofs or balconies where water collects after every rain.
Property managers and developers maintaining multi-unit buildings, office parks, and complexes where poor drainage leads to ongoing maintenance calls.
Industrial and commercial sites with large roof slabs or parapet walls that experience frequent ponding or ceiling leaks.
Architects and builders seeking reliable partners to correct or enhance drainage during renovation or post construction work.
If you notice standing water that takes hours to dry after rain, visible cracks in your waterproofing layer, or leaks inside the building below, slope correction is the long term fix you need.
For roofs where ponding is already causing coating breakdown, our roof waterproofing services may also be required.
The Real Problems We Solve
Persistent leaks that reappear despite previous waterproofing
Ponding water that accelerates roof wear and structural stress
Clogged or poorly positioned outlets that trap water
Thermal expansion damage caused by standing moisture
Mould and damp inside ceilings and walls below
By reshaping how water flows, we eliminate the root cause of most waterproofing failures, not just the symptoms.
The Long-Term Benefits of Correct Slope and Drainage
A well drained roof or balcony lasts significantly longer. Once we correct the gradient and install efficient drainage, your waterproofing system can perform exactly as it should, shedding water instead of fighting it. This reduces stress on coatings, prevents cracks, and stops hidden moisture from damaging the structure.
Beyond leak prevention, our clients also notice cleaner surfaces, reduced maintenance costs, and a more professional finish. Many roofs we have corrected have stayed leak free for over a decade, even through Johannesburg’s harshest weather.
If poor slope has already caused rising damp or moisture transfer, our interior damp proofing service can address the internal damage.
Our Proven Process for Reliable Slope and Drainage Correction
Inspection and Water Flow Mapping – We assess the existing slope, drainage routes, and areas of ponding.
Design and Planning – Create a custom correction plan with drainage points and improved water direction.
Surface Preparation – Clean, repair cracks, and ensure solid adhesion before rebuilding.
Slope Correction – Apply screed or lightweight filler to form the correct fall.
Drainage Installation – Add or replace outlets and channels for consistent flow.
Waterproofing and Finishing – Seal with high performance waterproof membranes and UV resistant coatings.
Every project is completed with testing to confirm full water runoff before sign off.
Frequently Asked Questions
How do I know if my roof or balcony slope is incorrect?
If you see standing water that doesn’t drain within a few hours after rain, or if leaks keep returning, the slope is likely the problem.
Can slope correction be done without removing existing waterproofing?
In some cases, yes. If the base layer is sound, we can add lightweight fillers to correct slope before applying a new waterproofing system.
How long does the process take?
Most residential projects take 2 to 4 days, depending on size and complexity.
Do you guarantee the work?
Yes, we provide a workmanship guarantee on all slope correction and drainage work, backed by long life waterproofing systems.
Will slope correction change the roof height or look?
The adjustment is minimal, just enough to create proper flow while maintaining a neat, professional appearance.
If your roof or balcony holds water after every rainfall, the real problem isn’t just waterproofing, it’s poor slope and drainage. Contact us today for a professional assessment and long term solution that keeps water moving where it should, away from your property.
Service Areas
We provide professional flat roof waterproofing across Johannesburg, including:
Sandton, Midrand, Bryanston, Fourways, Bedfordview, Rosebank, Melrose, Hyde Park, Randburg, and surrounding suburbs.