Sep 20, 2018 Last Updated 8:58 AM, Sep 17, 2018

CARLISLE CM Europe discusses the compatibility of EPDM for green roof projects

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The green roof segment harbours a great deal of potential and will become increasingly significant as climate change continues. Cities are expanding, and the global population is growing steadily. As building development increases, natural green spaces are clearly being lost, but this process can be supplemented with green roofs.

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The positive effects that green roofs have on buildings, people and the environment above all else are therefore incomparable to any other building concept.

Green roof constructions improve the heat and noise insulation of a building structure, have an air purifying effect, catch rainwater and discharge it at a delayed rate, enhance the area’s biodiversity and have added aesthetic value.

Single-ply EPDM waterproofing membranes, such as RESITRIX and HERTALAN, are compatible with every green roof structure, which means you are free to choose types of vegetation. Self-adhesive bitumen-backed membranes are hot air-weldable and also root-resistant. In addition, EPDM membranes can be cut and bonded to bespoke sizes for fast installation. The EPDM system can be fitted as a membrane (fewer seams during installing, resulting in a reduced risk of leaks) and will generally exceed the lifespan of the vegetation layer.

EPDM green roof construction is the most environmentally-friendly choice as a waterproof layer under roof vegetation.

Taking responsibility for the environment

Some of the market-leading membranes like RESITRIX only contains ecologically-safe components and no hazardous additives such as chlorine or plasticisers. These membranes can be classified as completely non-toxic and, unlike other common materials or currently used roof systems, it does not release any chemicals into the atmosphere throughout its entire service life.

The lifecycle analysis (environmental impact) of fully bonded membranes can also be assessed as being very positive, according to an independent study (CREM study). All the relevant processes throughout the entire lifecycle were considered during the study. Taking the various fixation methods and the products’ long service lives into account, EPDM membranes are an eco-friendly choice with regard to its environmental impact. EPDM membranes are recyclable, which ensures that we also meet our responsibility towards the environment in this regard.

Why EPDM?

A waterproofing system used on flat roofs has much to endure. Above all, moisture, thermal and mechanical stresses (wind, sun, cold, precipitation and so on) lead to serious material demands which quickly age many waterproofing systems. It is no wonder that the procedure for producing EPDM (ethylene propylene diene monomer rubber) received a Nobel Prize. Due to its molecular structure, EPDM has outstanding material properties.

Types of green roof

Intensive
Intensive component green roof systems consist of multiple layers including drainage, filter, substrate and a wide range of landscaping options depending on the substrate depth.

Key features
• Comprises four layers: drainage, filter, substrate and landscaping options
• Easy installation with pre-grown vegetation for instant effect
• Delivered in palletised form
• System with water storage capacity
• Variety of different species: well-rooted and grown to maturity
• A greater choice of seasonal variation in plants and colours
• Create recreational space.

Extensive
Extensive component green roof systems consist of multiple layers including drainage, filter, substrate and sedum/wildflower mat.

Key features
• Comprises four layers: drainage, filter, substrate and sedum/wildflower mat
• Easy installation with pre-grown vegetation for an instant green
• Delivered in palletised form
• Lightweight system with water storage capacity
• Variety of different species: well-rooted and grown to maturity
• Offers seasonal variation in colour including a vivid flowering season to attract pollinators
• Blankets may be installed on sloping surfaces of up to 30º.

Biodiverse
Biodiverse component green roof systems consist of multiple layers including drainage, filter, substrate and a plantation determined by nature dependent on the substrate depth.

Key features
• Comprises four layers: drainage, filter, substrate and natural plantation
• Easy installation
• Create natural habitat for plants, birds, animals and invertebrates to thrive
• Delivered in palletised form
• System with water storage capacity
• Natural choice of plantation complementing your local surroundings.

Modular
Modular green roof systems comprise four layers: drainage, filter, substrate and sedum.

Key features
• Easy installation with an exceptional sedum growth coverage
• Delivered in palletised form with a maximum number of 66 modules per pallet (15m²)
• Lightweight with a high water storage capacity
• Eight to 10 different sedum species are well-rooted and grown to maturity.

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