• HQ Call: +27 (0)12 660 1616
  • Email: info@gast.co.za
  • GAST Liberty Park 96, Achilles Str. Zwavelpoort, Pretoria, South Africa

Waterproofing Systems

More Than Just 44 Years Experience With Waterproofing Systems

We are one of the first manufacturers and installers of waterproofing systems in Africa, with more than 44 years experience. Our waterproofing products are designed to the highest specifications and endure a strict quality control to ensure our clients receive the very best products. It is because of this, coupled with our decades of experience and expertise that our name has become synonymous with cutting edge technology and quality products in the waterproofing industry.

Our waterproofing systems are designed to be a tough and seamless membrane created to repel moisture and to resist chemical and environmental challenges. Our products deliver a dependable service on virtually any building service, including the following:

  • Hotels
  • Parking Decks
  • Retainer Walls
  • Balconies
  • Shopping Malls
  • Walkways
  • Office blocks
  • Mines and
  • Schools


We only use the very best and highest rated quality products to complement our superior workmanship and expert engineers to execute each product flawlessly. These range from the following:

  • APP Modified Bitumen
  • SBS Modified Bitumen
  • Acrylates
  • Chlorosulphonated Polyethylene
  • Epoxy
  • Polyurethane


When properly maintained our waterproofing systems can last indefinitely. Because of our stringent Quality Assessment and Quality Control procedures, our clients are ensured a leak-free structure. We formulate products designed especially for roof systems, walls, decks and below-grade surfaces and a wide range of specialty applications.

There are a number of factors we are proud to point out which is directly responsible for setting us apart from our competitors – the first being our quality products and superior workmanship. Accurate problem diagnosis already saves you money as we are equipped to immediately work on the solutions. Our well deserved industry reputation is built on not only excellent service but the honoring of our guarantees as well. We develop long term solutions for our clients ensuring that they truly receive the very best value for their money.

Blind-side waterproofing systems is usually incorporated in the design of new constructions which are built on the property line. There are many types of products which can be used for blind-side waterproofing, ranging from sprayed elastomers, PVC membranes, and special SBS self adhesive membranes, but geosynthetic clay liners are the absolute best and most preferred materials for this purpose, all of which we provide at competitive prices to our clients, along with our expert knowledge and experience.

We offer our clients not only the finest quality products and services, but our wide ranging expertise on the subjects of waterproofing systems, civil engineering and geosynthetic materials. With decades of experience to fall back on, our clients are assured of only the very best in industry accredited workmanship and quality controlled and tested products. We realize that as a company you are only as good as your last project, and thus endeavor to create a masterpiece with each of the projects we take on.

Contact Gast for all your waterproofing system requirements, and a fail proof, cost effective and quality assured solution to your waterproofing needs and necessities.