With their many environmental and practical benefits and their ability to increase the likelihood of a successful planning application, green roof systems are becoming more and more popular. Polyroof’s roofing membranes are seamless, maintenance-free, light-weight and exceptionally long-lasting – making them the ideal green roof base. Whether you need a full green roof system designed or simply just the roofing elements, Polyroof can tailor a solution to your exact requirements.

Polyroof membranes are quite simply the number one choice when it comes to waterproofing Green Roofs. Here’s three key reasons why:

1. Waterproofing that’s Proven to Last

Don’t take our word for it; the BBA certificate states “When fully protected and subject to normal service conditions in an inverted roof specification with an open covering, the system can provide an effective barrier to the transmission of liquid water and water vapour for the design life of the roof in which it is incorporated”. Read it for yourself here.

2. Seamless, Maintenance-Free Waterproofing

Polyroof systems are cold liquid-applied in-situ to form a continuous, seamless waterproofing membrane. This means there are none of the weak points associated with the lap joints of sheeted roof materials, such as felt (reinforced bitumen) or single-ply. When you choose Polyroof, you minimise the risk of having to undertake the costly and cumbersome temporary removal of the green roof for maintenance or inspection.

3. Lightweight & Fully Root-Resistant Membranes

Load bearing often presents a particularly challenging aspect when designing a green roof. Weighing around 3.4 kg/m2 and available in innovative warm roof designs that do away with the need for over-decking or carrier layers, Polyroof waterproof membranes are as low in weight as they are high in performance. The membranes provide the ideal combination of flexibility and robustness and are easily tough enough to resist roots without the need for additional protective layers.

Green flat roofs are becoming increasingly popular, and for good reason. As well as providing an attractive finish, there are many environmental benefits to a green roof including:

    • Reducing Urban Head Island Effect – By absorbing CO2 along with the cooling effect of the daily dew and evaporation cycle, green roofs are able to positively contribute towards reducing the Urban Heat Island (UHI) effect.
    • Greater Biodiversity – Green roofs provide a natural habitat for a wide variety of wildlife; this is especially important in cities and built-up areas where green areas are infrequent.
    • Storm Water Management – The overworked sewer systems are an increasing concern as flash floods become more commonplace. By controlling the surface water run-off volumes, green roofs can play an important role in reducing flood risks during intense rainfall periods, as discussed in this BBC News article.
    • Improving Air Quality – The vegetation on a green roof absorbs and filters many of the airborne particles and pollutants from the atmosphere. This contributes to reducing greenhouse gas emissions and improving air quality in urban environments.
    • Thermal Insulation – Green roofs have been shown to significantly reduce the need for air conditioning and cooling systems during hotter periods and can also offer a small thermal insulation benefit during winter months.
  • Sound Insulation – The plants, growing medium, water and air within a green roof can considerably reduce the noise coming through a roof.

Polyroof Green Roof Brochure

Our Green Roof Brochure has been designed to provide specifiers with the key information needed to design an optimum green roof.

Content includes:

  • Intensive, extensive and biodiverse green roof designs
  • Design and technical assistance
  • Incorporating insulation within the design
  • Detailing advice and guidance
  • Looking after your green roof

Grand Designs: Green Roof Project, Windermere

The Protec system was used to waterproof the domed green roof areas of this sustainable house development on Channel 4’s Grand Designs show. With an ambitious vision and a tight budget, Robert and Milla Gaukroger set about transforming an unattractive 1980’s house overlooking Lake Windermere into a state-of-the-art sustainable home. In order to blend into the hillside setting, the domed roofs of the house were to be covered with a wildflower meadow mix to provide a green roof construction… [Read More]


Green Roof for Low-Pitched Swimming Pool Roof

The architect of this swimming pool extension of a property in Bletchingdon, Oxfordshire, required a high performance waterproofing membrane as part of a green roof construction. The project demanded an extremely durable and long-lasting solution with BBA approval, as well as thermally efficiency that met current building regulation standards. Being located over a swimming pool it was also essential that the roof was impervious to the large amounts of water vapour that would be present… [Read more]


Intensive Green Roof for Beachside Property

St. Martin, Jersey is home to Le Sapin, a single storey beachside home which boasts panoramic views of Gorey Castle and the surrounding Grouville Bay. The architects designing the home created a roof consisting of flat and curved areas that that were to incorporate an intensive green roof system…. [Read more]

Let Polyroof Take Responsibility for Your Roof

Polyroof’s reputation has been built on the high level of technical support provided to clients before, during and after every contract. We like to work closely with our clients from the very beginning of a flat roofing project right through to completion and throughout the lifespan of the roof. From our experience, this is the best way to guarantee that all aspects of the roof are finished to the superior standards that our clients expect.

Importantly, we understand that our clients are often tasked with many responsibilities during a construction or refurbishment project. Flat roofs mean a great deal to us, but we know our clients have plenty of other aspects of a project to focus on.

This is why we strive to take on board as many of the challenges and issues associated with the flat roof that we can, freeing up our clients’ time so they can focus their efforts where they are needed most.

If you would like assistance with your project please complete the quick form below, call our Technical Team on 0800 801 890 or email technical@polyroof.co.uk

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