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Waste is a very important topic in discussions on fighting climate change. Reducing, reusing, and recycling are the imperatives valid that apply to everyone, and on whatever scale. Still, there are domains that should pay special attention to the materials use. Construction is certainly one of those domains, with construction and demolition waste (CDW) accounting for approximately 25% - 30% of all waste generated in the EU. EPDM membranes such as Elevate’s RubberGard EPDM can help significantly reduce the environmental impact of buildings. Here’s why.
With landfill gases and air quality problems exacerbating due to the discarding of increasing waste volumes, the construction industry is looking to provide long-term sustainable solutions that not only save money by extending the service life of buildings but also reduce the demand for energy and other natural resources.
Eliminating the unnecessary replacement of materials, repurposing used materials and recycling what cannot be reused or transformed, are practices applied by many roofing manufacturers. The question of sustainability has also become central for architects selecting the materials for their eco-conscious designs, and roofing membranes are no exception.
What makes a roof sustainable? First of all, it’s about using the least amount of resources. Secondly, it’s a matter of durability: the longer it lasts, the better. Finally, it should be made of a material that can be reused or recycled.
In general, roofing membranes have the highest environmental impact (expressed in GWP -Global Warming Potential or equivalent CO₂) at the time of their production and disposal. This means that the premature failure of a roof constitutes nothing short of an environmental disaster, especially when taking into account hidden environmental costs such as the additional manufacturing, labor, shipping, tear-off and related energy costs needed to replace a roofing system. However, if the durability of a roof is significant and can be further enhanced through repairs, its overall impact on the environment is drastically reduced.
There is no doubt that choosing a durable roofing system is an important part of the designing process for anyone who wants to be environmentally responsible. EPDM roofing membranes such as RubberGard EPDM checks all the boxes of environmentally responsible, circular construction.
EPDM (Ethylene-Propylene-Diene Terpolymer) roofing membranes are 100% vulcanized membranes made of a synthetic rubber Ethylene-Propylene-Diene Terpolymer. They were first introduced in the roofing industry in the 1960s and have since been used around the world in all types of climates. The production of EPDM membranes has a low embodied energy number (i.e. the amount of energy required to produce and implement a product from material extraction, manufacture and installation).
Studies prove that when it comes to the use stage, EPDM roofing membranes show exceptional durability compared to other roofing materials. With a life expectancy of over 50 years *,EPDM roofing membranes such as RubberGard EPDM remain stable and unchanged over time, also thanks to their high resistance to ozone, UV radiation, microorganisms and severe weather conditions such as hail.
Another important factor is the outstanding elasticity of EPDM membranes. Even in extreme temperature fluctuations, they easily expand and contract, thereby accommodating to the potential building movements. That is why RubberGard EPDM can be used in a variety of climates, from the sub-zero temperatures of Alaska to the sun-baked landscapes of the Middle East. Last but not least, EPDM roofing membranes do not contain volatile ingredients or products that may migrate or degrade over time, such as plasticizers or antioxidants, so there is no danger of the material becoming brittle or cracking, even after several decades of exposure.
Greenpeace, GreenTeam and the Dutch Institute for Building Biology and Ecology (NIBE), have put forward EPDM roofing membranes as the ones with the lowest environmental impact. NIBE’s assessment, carried out every two years, takes into consideration the initial costs (material and installation costs) as well as all hidden environmental costs (raw material consumption, energy consumption during production, etc.) of different types of roofing membranes. The result of this comparative classification shows that mechanically attached and fully-adhered EPDM roofing membranes such as RubberGard EPDM have the lowest hidden costs, which makes them the most environmentally friendly flat roofing choice.
In addition to their low initial environmental impact and remarkable durability, RubberGard EPDM roofing membranes are easy to repair, which means their service life can be extended beyond 50 years. They are also very adaptative. Even several decades after the initial installation, changing roof details, adding skylights, roof vents and other roof openings can be easily done without having to tear off the membrane.
Thanks to these attributes, RubberGard EPDM roofing membranes can play a key role in achieving the highest scores in recognized green building rating systems such as BREEAM© and LEED©. These assessment methods evaluate buildings according to the efficiency with which they use natural resources and their overall impact on human health and the environment. What further enhances the environmental credentials of RubberGard EPDM is its suitability for application on ‘active’ roofs such as green roofs, solar roofs and water-collecting roofs (also known as blue roofs).
At the end of their service life, RubberGard EPDM roofing membranes can be either reused or recycled. Membranes that have been held in place using ballast (river-washed gravel or pavers) can be simply removed and relocated to another roof. If they have been mechanically attached, they can also be recovered by removing the fixing elements.
Another way of reusing end-of-life RubberGard EPDM roofing membranes is by downcycling. Thanks to their stable composition, they can be grinded into smaller rubber compounds and used for sports tracks, roads or rubber mats for children’s playgrounds, among others. Ingredients such as carbon black can also be extracted from EPDM and can be reused either as fillers in new EPDM membranes or as compounds for different materials.
When reusing or downcycling are not an option, RubberGard EPDM membranes can be recycled. There are several ways to recycle EPDM, such as chemical and mechanical recycling, pyrolysis, devulcanization, etc. However, recycling should only be considered as the last option before landfilling/incineration, since energy and resource demand for recycling can end up being much higher than producing virgin products.
*“Evaluation of the useful life of EPDM roofing membranes”, German Süddeutsche Kunststoff-Zentrum (SKZ).