Seamless protection for a sustainable world, explore the benefits of liquid roofing system for your green roof project.
Get Your Bespoke
Project Pack
With many environmental and practical benefits, green roof systems are becoming more and more popular. Polyroof’s liquid roofing membranes are seamless, maintenance-free, light-weight and exceptionally long-lasting. This makes our systems the ideal green roof base. Whether you need a full green roof system designed or simply just the roofing elements, the Polyroof team of experts can tailor a green roof solution to your exact requirements.
Polyroof is a proud member of The Green Roof Organisation (GRO), which develops and imparts guidance relating to the adoption of green, blue, and biosolar roofing technologies within the built environment. Through our collaboration with GRO, we have bolstered our waterproofing membranes for installation in conjunction with green roof systems.
Need help with selecting a system for your project?
Our Bespoke Solution Finder can provide you a detailed project pack containing all the relevant information for your project.
Polyroof offers a range of technically advanced, cold-applied liquid waterproofing membranes that are all highly resistant to penetration and ideal for use as part of a green roof construction. Polyroof waterproofing systems are BBA certified for use with green roofs, helping you deliver increased biodiversity where it is needed most and enhance climate change mitigation & resilience in the built environment.
No matter the size, shape or complexity of a roof, Polyroof’s liquid systems will form a seamless waterproof membrane across the entire roof area. The finished surface is tough, flexible and impervious to water. This makes a liquid system the ideal green roof base.
With proven lifespans in excess of 25 years, Polyroof’s liquid roofing systems are the number one choice for all green roof applications.
Green roofs systems can reduce energy costs by creating natural insulation, they create peaceful retreats and recreational areas, they provide natural habitats for wildlife, and they absorb storm water thereby reducing run-off into overworked sewer systems.
On a wider scale, in city environments, green roofs improve air quality by absorbing pollutants and by helping to reduce the urban heat island effect. City and suburban developments absorb and trap heat whereas evaporation from a green roof has been shown to cool surrounding air temperatures. A green roof must, like any roof, protect the building from the elements via a high quality, totally dependable waterproof membrane.
Polyroof’s cold liquid-applied seamless membranes are ideal waterproofing solutions for use in green roof systems because they are flexible enough to easily accommodate structural movement as well as being lightweight and extremely durable. When used in a green roof system the durability of Polyroof membranes are even further extended since there is no UV penetration.
Adequate thermal insulation should always be provided within the design, compliant with current building regulations standards. The most common ways of insulating in new build constructions is via a warm roof or an inverted roof. Full design details for these are contained within the relevant Polyroof technical literature ‘product information and design guides’. Thermal transmittance calculations should always be carried out to ensure that the required U-Value will be achieved and to ensure that the risk of interstitial condensation is within acceptable limits. Calculations can be provided by Polyroof Technical Services or direct from the insulation manufacturer.
When specifying a green roof, there are a number of important considerations to bear in mind. We have highlighted some of the key elements below. For further information, please contact us and a member of the team will be in touch.
With any flat roof design, it is always recommended that a sufficient fall (minimum 1 in 80) is provided to assist drainage. However, it is worth pointing out that Polyroof systems are not affected by standing water, and can therefore be applied to completely flat roofs (if required).
Polyroof liquid applied systems can be used in conjunction with most standard drainage outlets (e.g. Hunter PVCu Range or Caro Aluminium Range) subject to correct preparation. The number of outlets required when using a green roof design can be reduced significantly due to the increased retention of water in the green roof and lower run off. The outlet manufacturer should be able to give advice regarding this. Alternatively, contact specialist consultants such as CRM rainwater consultancy for calculations.
Green roofs can be specified on pitched or even barrel vaulted roofs. Special design requirements may be required, however, for roofs in excess of 10 degrees and it is advised that Polyroof technical services are consulted for advice. All Polyroof waterproofing membranes can be applied to pitched roofs and even to vertical surfaces.
Care should be taken when any proposed refurbishment projects to ensure that the existing structure is sufficient to accept the weight of the green roof. Perimeter detailing should also be considered to ensure that sufficient up-stand heights exist for the new construction.
Polyroof manufactures an exclusive range of robust GRP trims, allowing complete control over product quality. The trims are fully compatible with green roof designs.
Polyroof systems are installed via our network of fully trained and accredited contractors. The waterproofing element of the work is always carried out to the highest standards by approved Polyroof contractors. The green roof construction itself can either be carried out by our green roof partners or by your own preferred green roof specialists.
Intensive green roofs often incorporate hard landscaping features such as decking or paving areas. Paving should be laid on proprietary support pads such as CARO support systems. Care should be taken not to bed paving slabs on cement based screeds.
Depending on the type of green roof specified, some maintenance may be required to the vegetation layer. In general, extensive roofs using low growing sedum vegetation require very little maintenance, whereas intensive roofs should be maintained as you would a typical garden. The designer also needs to consider safe access for maintenance purposes. All Polyroof waterproofing systems are maintenance free in normal use, although ancillary items such as flashings will need to be inspected periodically.
Polyroof offer a wide range of market leading sustainable roofing solutions and tools, all backed up by innovative UK based R&D and manufacturing. Whatever your sustainability goals are; Polyroof can help.
We have made our Protec Evolve System Carbon Neutral.
Protec Evolve has been certified carbon neutral by an independent third party (Carbon Footprint Ltd). The cradle-to-grave carbon emissions of Protec Evolve are fully offset using Verified Carbon Standard (VCS) greenhouse gas credits which support renewable energy projects around the globe.
