Roof Garden Waterproofing

a Waterproofed Roof Garden gives peace of mind!

Roof gardens – the way of the future!

The idea of building a roof garden may seem beyond your reach and an expensive exercise, but besides the aesthetic appeal it is a great way to liven up a space, particularly in the City and increase the value of a property.  Not only is it a perfect place to watch the sunset or grow your own vegetables –  it’s also good for the environment!  Roof gardens have become a socially conscious trend for many South Africans in the private and corporate sector, and Government authorities along with eco-friendly organisations support the fact that this the future of roofs in our country, and the world. 

You don’t require any special horticultural knowledge to start a roof garden – all it takes is enthusiasm for green living and the willingness to get your hands dirty.  But before you get planting and dusting off your deck chairs, it is important to design and plan your roof garden carefully.  Once the structural ability to support the weight of the soil, water and vegetation has been established, you will want to establish the watertight integrity of the structure to make sure your roof garden is completely waterproof.  By factoring in a specialised waterproofing system which is a major component in the construction of a roof garden, will ensure that no leaks occur that could potentially cause damage to underlying rooms or the building structure itself.  

Our Green Roof Garden Waterproofing Seal System uses Firestone RubberGard® EPDM which is the ideal membrane for green roof systems, used in combination with lightweight and low maintenance vegetation. The large, seamless (up to 930 m²), lightweight and flexible EPDM membrane has successfully passed the FLL test for root penetration and can therefore provide dependable performance in a demanding rooftop environment.

Roof Garden Waterproofing Benefits

Additional benefits of the using Firestone RubberGard® EPDM waterproof membranes for your roof garden are:

    • Increased life expectancy of the roof
    • Added value and aesthetics 
    • Lower energy costs
    • Easy installation and maintenance 
    • Improved air quality
    • Reduction of the urban heat-island effect 
    • Storm water management 
    • Extra soundproofing and insulation 
    • A natural habitat for plants and birds

Our eco-friendly, re-cyclable Firestone RubberGard® EPDM single-ply roof waterproofing systems are designed for the flat roofs of commercial and industrial buildings, including domestic, large residential developments, hospitals, schools and office buildings. 

You might also be interested in Flat Roof Waterproofing

roof garden waterproofing
roof garden waterproofing

Frequently Asked Questions


Answer: Most certainly. However, one requires certain safeguards before planting can begin, such as:

  1. Firstly, one should ensure that your roof is sufficiently strong to support the weight of a roof garden, depending on the make-up of the substrate – metal, wooden, or concrete. This would normally require expert advice from an Engineer or Roofing Contractor;
  2. Once the structural ability to support the weight of the soil, water & growth has been established, one would then need to establish the watertight integrity of the structure – to make sure that the roof is watertight, it would be ideal to retain the services of a reliable & experienced waterproofer, such as Waterproof Lab, who have undertaken this type of installation on many roofs on existing buildings, using the failsafe EPDM RubbberGard waterproof membrane used by Waterproof Lab, specifically produced for this purpose, as well as many other specialized requirements;

Answer: Yes, you can grow anything from flowers to drought tolerant herbs, such as Rosemary, Thyme & Chives on a green roof, most successfully;

Answer: It is recommended that, during the first year, you water your roof fairly regularly, in order to aid establishment. However, generally speaking, in order to retain the “green” roof, in terms of being ecologically friendly, it shouldn’t require watering after the first year;

Answer: Plants with fibrous roots should not cause any harm to the roof, but avoid planting those with tap roots;

Answer: You don’t require any special horticultural knowledge to start a roof garden. All it takes is enthusiasm for green living & the willingness to get your hands dirty.

  1. Answer: There are a number of benefits which can accrue from a terrace garden, ie: 1) Reduce indoor temperature by 6-8 degrees, thus saving in air conditioning costs;
  2. Reduce overall heat absorption by of the building & insulate against heat & cold;
  3. Convenience & saving with safe, pesticide free fresh & healthy seasonal vegetables.


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