The #1 Waterproofing Specialists in South Africa​

Africa’s leader in application and supply of high quality waterproofing systems that waterproof, restore and preserve buildings from basement to roof

Who are we and what do we offer you?

Waterproofing Specialists

Themi Stergianos, founder of Waterproof Lab identified the dire need to offer world class specialist waterproofing solutions and systems to the building industry in South Africa.  He has made this available to professionals such as architects, engineers, quantity surveyors and more so that they can provide ground breaking design and waterproofing technology and systems to their own clients that match the best in the world.  Waterproof Lab has built its credibility by annually attending International Waterproofing Conferences world wide by bringing back to South Africa the best the world can offer in the building industry. 

Waterproof Lab offers unique and lasting waterproofing solutions that work.

This is a company that is built on values that are solutions-based, forward thinking and provide security and peace of mind to their clients.

Waterproof Lab has become a reputable and disruptive force in the local waterproofing market. They are known for their honesty, speedy turn around time, integrity and ground breaking technology – offering the longest warranties in the industry. 

Waterproofing from Basement to Roof

Positive Waterproofing:

Flat roof EPDM and TPO membrane (factory cured membrane for balconies, parapet walls and large flat roofs) Aqua Waterproofing Membrane for potable water or Eco pools and Roof Gardens

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Negative Side Waterproofing

Specialist slurry solutions for waterproofing for tanks and tunnels, restoration plasters, rising damp horizontal barrier solutions, and crack injection and crack repair systemsand concrete repair and protection products....

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Flat Roof Seal System

Leaking flat roofs are a dire problem in South Africa, where professionals and contractors are faced with the dilemma of leaking flat roofs or low sloped roofs due to...

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Balcony Seal System

Balconies are one of the most common sources of water leaks which can lead to structural damage. The biggest problem being most waterproofing products...

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Solar Roof Seal System

EPDM rubber waterproofing allows for screws to be sunk into waterproofing in order to mount panels which is then resealed with our specialised sealant. Your waterproof guarantee.

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Parking Decks Systems

Firestone RubberGard is also used very successfully as a waterproofing membrane under parking decks of large commercial or residential and office buildings.

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Box Gutter Seal System

Leaking Box Gutters in commercial buildings can be a problem to Tenants & Landlords. Waterproof Lab Gutter Seal is a rubber membrane that is cut to the length & width...

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Foundation Wall Seal System

EDPM RubberGard™ is a great product for waterproof foundations. In this photo we used a 1.14m EPDM, protected it with...

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Water Containment Seal System

Waterproof Lab has partnered with Firestone BPE to exclusively offer RubberGard™ EPDM. EPDM ...

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Roof Garden Waterproofing

Besides the obvious aesthetic benefits, roof planting may provide the building with insulation, temperature control and architectural...

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Roof Lab

Metal Roofs with Wood

Our professional team specialises in restoring damaged roofs, or replacing roofs with completely new concrete, aluminium, timber, or any other roofing system, should it be required! Roof Lab also specialises in insulation of roofs.

Metal Roof Sheets

Our professional team specialises in restoring damaged roofs, or replacing roofs with completely new concrete, aluminium, timber, or any other roofing system, should it be required! Roof Lab also specialises in insulation of roofs.


Our professional team specialises in restoring damaged roofs, or replacing roofs with completely new concrete, aluminium, timber, or any other roofing system, should it be required! Roof Lab also specialises in insulation of roofs.

Build Lab

Restoration Projects

Removing tiles, old waterproofing and restoring waterproof-damaged buildings.

Build Projects

Restoring water-damaged walls and waterproofing weather-facing buildings.

Benefits of EPDM

EPDM rubber waterproofing systems allow the substrate underneath it to breath. These products are vapour permeable, meaning any existing moisture or dampness can escape, while the membrane retains its ability to remain fully waterproof against the elements.

A one piece roof system comes prefabricated from the factory, reducing the time and costs related to man hours during the installation process. This allows EPDM systems to be measured, fabricated and installed quicker than most other roofing products. EPDM breather membranes can also be used as an EPDM overlay, saving even more time and money on flat roof replacement projects.

EPDM rubber membrane is highly elastic and will accommodate excessive stretching and building movements without a problem!

EPDM roofing systems will not tear, crack or split! They can, in fact, stretch to > 400% without damage.

EPDM provides peace of mind in that it is made to measure in the workshop under ideal working conditions, with consistent quality control. This also makes EPDM ideal for lining lakes, reservoirs and ponds, requiring minimal seams in application

50 year minimum proven life expectancy, as well as a 20-year guarantee for roofing and structural waterproofing works.

With no flame torches or hot boilers being required to install EPDM rubber membrane, it is applied cold, therefore obviates the risk of fire, noxious gases to workers, premises and surrounds.

FR Grade; non-ballasted: AA Standard; ballasted: FAA

EPDM remains unaffected by extreme temperature variations having been exhaustively tested to withstand temperatures varying from -40 to 110 degrees Celsius.

The membrane is resistant to root penetration and is therefore ideal for roof gardens in addition to flat roof waterproofing. Some even exceed the German FLL tests for root penetration.

EPDM is the most environmentally friendly waterproofing product on the market, as it is recyclable, using less volatiles in its manufacture than most other products, coupled with its very low usage of global resources

EPDM membranes are resistant to atmospheric pollutants such as acid rain and ultraviolet light.


A rubber membrane that is available in rolls measuring 3m, 6m  or 9m wide & 30m long, which can either be loose laid or fully adhered, to flat roofs of various substrates, with a lifestyle expectancy of 50 years.  Click here to get an overview of the different EPDM roofing systems 

With an integral UV protector in its manufacture, it has been proven to last in excess of 50 years, through a range of climatic  conditions, including rain & snow, below freezing, to the hottest, ultraviolet laden sun; 

Applying EPDM is a simple process, employing a specially formulated  contact adhesive & sealants, to lay over a flat roof or other surface & once adhered, smoothed out to ensure a crease & bubble free finish; 

Over more than 50 years, EPDM has been manufactured to a special blend of environmentally friendly materials, including UV inhibitors, which has been proven to last in excess of 50 years, under the most adverse conditions – successful where others have generally failed; 

One of the benefits of EPDM, is that it does not require protection from the elements, which saves on on-costs over the years. This is unlike similar competitive products which a Silvakote or similar every 2-3 years to maintain the warranty and protect the membrane from the sun.  However, should one prefer a coloured aesthetic finish, there is no reason that it shouldn’t be coated with an acrylic-based paint; 

There is absolutely no reason why it should not work as well on pitched roofs. In fact it presents a very sensible option to waterproofing, with the ability to cover the existing roof cladding, without having to reroof, be it metal, tile, or whatever, & it will be particularly effective, due to the pitch enabling even greater water management; 

This total installation cost will depend on the amount of detail required to waterproof.  Size of roof & the number of water outlets or other penetrations, such as water &/r air-conditioning pipes, are a variables that can attribute the total installation cost.   However, we would like to assess each situation on it’s merits, so we can estimate the least expensive price to assist our clients – so please get contact us at +27824151694 so we can discuss your project.   

Each project has its own merits however in general, EPDM membrane may be laid over asphalt or other materials, by first laying a sheet of ‘Bidem’ to protect it from the original material.  

No problem; simply lay a screed of cement over the protected EPDM, ensure is a ‘fall’ in the substrate to allow water to efficiently drain to the outlets and tile’.  We do this all the time and this feature sets us apart from most waterproofing membranes in the market, 

There are many materials which have historically been used for waterproofing flat roofs. However Waterproof Lab’s RubberGard EPDM membrane has become the membrane of choice in many countries, on account of its ability to stretch, reduce number of joints required, ease of application, protection against UV & cost effectiveness; 

  1. It is most eco-friendly, having been used for years as a pool liner which sustains fish life & plant growth. Firestone RubberGard EPDM is an inert roofing material with limited environmental impact during manufacturing, installation and use: 
  • The initial production of the membrane has a low embodied energy number. 
  • The effectiveness of the EPDM polymer results in low quantities of polymer being required to obtain proper mechanical and physical properties. 
  • During the membrane’s service life, no toxic substances are released from the membrane, allowing collection and use of run-off rainwater for household applications. 
  • EPDM is a very highly durable material: Firestone RubberGard EPDM has outstanding weathering characteristics and a life expectancy up to 50 years. 
  • In regions like South Africa where Heat Degree Days outnumber the CoolDegree Days, a black EPDM membrane on top of a properly insulated roof can help to save energy and reduce associated carbon emissions. 
  • At the end of its service life, the membrane can be recycled and re-used 

For more information on eco-friendly properties of the Firestone EPDM Roofing and Lining Systems, download the EPDM Sustainability Brochure  

These ecological benefits, in combination with the membrane’s life expectancy of up to 50 years, make RubberGard EPDM an environmentally friendly roofing solution. 

Due to the ever increasing concern for the environment, green roofs are becoming a regular part of our landscape. The RubberGard EPDM membrane has successfully passed the FLL test for root penetration resistance in green roofs. It is an ideal membrane for combination with extensive green roof systems using lightweight and low maintenance sedum vegetation.  

The ecological benefits of a green roof system are numerous:  

  • Reduction of the urban heat island effect  
  • Reduction of energy costs  
  • Stormwater management  
  • New habitats for plants and animals  
  • Improved air quality  
  • Reduction of noise pollution  

Combine this with a Solar System solution, will be the ultimate in saving energy costs and reduction of carbon emissions – click here to find your eco-friendly solution or Green Roofing System  

  1. A resounding yes.  See how we did this here in an installation we did in the leafy suburbs of Noordhoek in Cape Town – see Waterproof Lab Facebook Page for video showing how we do it 


It has many benefits, which are listed in our ‘Benefits & Gains’ brochure. 

For best results, you will require a measuring tape, a chalk line, a pair of scissors, a paint brush & a rubber roller; 

It is always best to allow the substrate to dry before applying the membrane, as it is important to ensure that the bond between the membrane & the surface is not compromised.   

EPDM is a blend of materials – Ethylene, Propylene, Diene Monomer, which imparts it’s outstanding flexibility, strength & waterproofing characteristics, making it the most ideal, long lasting, material to use for any waterproofing problems, most particularly, flat concrete or other, roofs; 

EPDM is tough, flexible & resilient to foot traffic. Unlike most other waterproofing membranes, one of Waterproof Lab’s EPDM roofing systems main benefit is that it is also very easily & quickly repaired in the event of accidental damage simply cut a patch, apply a primer and Formflash patchto the damaged area, allow to dry & stick the patch down – & wallah! you once again have an uncompromised waterproof roof/deck!  See video for explanation  

  1. We currently import rolls of EPDM, measuring 6m wide x 30m long x 1.14mm thick, thus effectively giving access to a square area of 180m2.  We can get bigger sizes too but imagine covering 180m2 with now seams! 

NB: Detailed instructions as to the application procedures of our EPDMappear in our website, as do videos of the full application procedure.  Click here to access the information  

Low prices, qreat quality

Priced for South Africans

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