Keep Your Underground Tank Leak-Free
What We Fix with Underground Tank Waterproofing
Seepage into Tanks
Cracks in Tank Walls
Contamination Risks
Emergency Leak Sealing
Long-Term Tank Protection
How we work
1.
Quote
2.
Fix
3.
Guarantee
Methods We Use for Underground Tank Waterproofing
Underground Tank Waterproofing built for high water tables and heavy seasonal rain
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 Underground Tank Waterproofing Demands Specialist Expertise
Underground tanks are constantly exposed to soil moisture, groundwater, and hydrostatic pressure. In Johannesburg, where rainfall and fluctuating water tables are common, these pressures can cause cracks, leaks, and even contamination of stored water. Waterproofing is not just about sealing a surface, it is about protecting the entire structure from ongoing water stress both inside and out.
A properly waterproofed tank ensures clean, safe water storage and prevents structural degradation that could lead to costly repairs or replacements. At Itacorp, we understand the complex interaction between soil, water, and concrete and apply waterproofing systems that permanently resist those pressures.
If water is also penetrating nearby foundation walls or lower levels, you may need our foundation waterproofing service in combination with tank protection.
Why Our Underground Tank Waterproofing System Works
Unlike above ground structures, underground tanks face constant external water pressure, which means traditional sealants and coatings often fail over time. Our approach combines internal and external protection, creating a complete waterproof envelope.
We use cementitious coatings, liquid membranes, and crack injection systems that penetrate deep into the substrate, forming a flexible and durable barrier. These materials bond with concrete, allowing the structure to withstand soil movement, moisture expansion, and hydrostatic load. The result is a leak proof tank that stays dry, clean, and structurally sound for years.
Who Our Solutions Are For
Our underground tank waterproofing is ideal for:
Residential and commercial water storage tanks
Fire suppression water tanks
Sewage or greywater containment tanks
Industrial process tanks and sumps
Underground reservoirs and pump chambers
Whether your tank is newly built or showing signs of leakage, we provide tailored systems that address both immediate issues and long term durability.
For tanks located near basements or underground areas, consider our basement waterproofing systems for full structural protection.
The Problems We Solve
Cracks and leaks caused by ground pressure or structural stress
Seepage of groundwater into tanks during wet seasons
Contamination of stored water from soil infiltration
Structural weakening from prolonged moisture exposure
Degraded coatings that allow slow leaks to form over time
We fix these problems permanently using deep penetrating injection methods, reinforced membranes, and coatings tested to withstand high pressure and chemical exposure.
The Benefits of Proper Tank Waterproofing
100 percent leak prevention, stops seepage from both inside and outside
Safe, uncontaminated water storage, critical for potable water tanks
Extended structure lifespan, prevents corrosion and concrete degradation
Lower maintenance costs, no recurring sealing or patchwork repairs
Protection from Johannesburg’s high rainfall and soil pressure
Our systems are proven in local conditions and engineered for the long term safety and functionality of your tank.
If groundwater pressure is contributing to leaks elsewhere on your property, our drainage and slope correction solutions can help redirect water away from critical structures.
How We Waterproof Underground Tanks
Inspection and Structural Assessment – Identify cracks, seepage points, and pressure zones.
Surface Preparation – Clean, grind, and prepare internal and external surfaces for optimal adhesion.
Crack and Joint Sealing – Inject and seal cracks using pressure grouting or epoxy injection.
Coating Application – Apply internal and external waterproof layers, from cementitious to liquid rubber systems.
Final Reinforcement – Add fibre or membrane layers where needed for long term flexibility.
Testing and Quality Assurance – Conduct water retention tests before final approval.
Each stage is carried out by specialists trained in confined space safety and waterproofing for high pressure environments.
Frequently Asked Questions
Can you waterproof an existing underground tank that is already leaking?
Yes. We use injection and internal coating methods that seal leaks without needing to excavate the structure.
What type of waterproofing is best for underground tanks?
A combination of cementitious coatings and flexible liquid membranes provides the strongest, most durable protection.
Is the waterproofing safe for drinking water?
Absolutely. We use non toxic, potable water approved coatings for all drinking water tanks.
How long does the waterproofing last?
Typically 10 to 15 years depending on soil moisture and tank use.
Do you provide a guarantee?
Yes. All underground tank waterproofing includes a workmanship guarantee and product warranty.
If your underground tank is leaking, damp, or showing cracks, act early to prevent contamination or structural failure. Contact us today for expert underground tank waterproofing in Johannesburg, lasting protection built for local conditions and backed by proven results.
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.