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RCI December 2017

FLAT ROOFING & WATERPROOFING SYSTEMS Sustainability and single ply roofing materials So what does sustainable really mean when it comes to single ply roof 064 DECEMBER 2017 RCIMAG.COM coverings? The team at IKO Polymeric gives its view... To achieve sustainability with a single ply roof covering, the specified material needs to tick so many boxes. The first question to ask is what the material is made of and can it be recycled at the end of its life? Some projects have special planning requirements to meet a certain BREEAM or other sustainability rating. Therefore, it is important that the specified single ply roofing membrane counts towards the BREEAM rating. Some single ply membranes – when installed with the right roofing system elements – have a BREEAM rating of A+, such as our Armourplan PVC membrane. Reduced carbon emissions also play an important role in a project where sustainability is a key element. Buying products made in the UK contributes towards lower carbon emissions due to the minimised transport requirements. Other important factors include: – Does the manufacturer have ISO 14001 accreditation? – Does the manufacturer recycle waste materials during the production cycle and use minimal packaging? – For PVC membranes, what type of plasticisers is used? Cheaper plasticisers make the membrane less durable, and therefore less sustainable. – What is the certified BBA durability of the product? For instance, our Armourplan PVC and Spectraplan TPE membranes both have a BBA durability period in excess of 30 years. – Is the manufacturer BES 6001 accredited? It’s worth noting that the formulation of single ply can vary enormously from one manufacturer to another, which affects the end result. Using cheaper or less plasticiser in PVC membrane, for example, makes it harder to work with and less durable. The use of 1.8mm or thicker PVC membrane is normally a requirement on extended 20 and 25 year guarantees. The theory behind this is that it should last longer as it has a larger volume of plasticiser and is more robust due to its additional thickness. Whilst this theory is a valid argument, it should be considered that there are various qualities of plasticisers available on the market. If a 1.8mm membrane has a low quality plasticiser, then it will not necessarily last as long as a 1.2mm membrane using a high quality plasticiser. If you look at standard PVC membrane formulations across the industry, the top layer of membrane will contain a larger amount of UV stabiliser and fire retardant compared to the bottom layer. The bottom is generally a different colour to the top layer for identification purposes as a different formulation has been used and the membrane must not be installed upside down. A 1.8mm membrane may be more robust and not completely puncture when damaged, but once the top layer is broken, the lower layers are then exposed to UV which in time will break down the membrane if the damage is not repaired. Our Armourplan P membrane has been specifically developed for extended life expectancy. Armourplan P has a high performance reinforcement providing greater tensile strength and equal amounts of UV stabilisers and fire retardant in both the top and bottom layers of the membrane. With this specific formulation, we are also able to keep the membrane thickness to the standard 1.2mm thickness ensuring ease of installation and – importantly – a minimal thickness build-up at cross joints compared to a 1.8mm membrane. BES 6001 BES 6001 is a standard for responsible sourcing of construction materials developed by BRE Global. The independent certification scheme has been formed to provide better control over organisations’ environmental impacts throughout the whole supply chain. With the help of this scheme, manufacturers can assess and certify their products as being responsibly sourced. BES 6001 is also recognised by the BREEAM family of certification schemes, therefore BREEAM credits can be awarded for products certified through BES 6001. To achieve the BES 6001 certification, a minimum 60% of the fundamental materials in the assessed product should be traceable down the supply This image: Grove Hotel, green roof; Right, top: Bellway residential property; Right, below: BES 6001 standard logo


RCI December 2017
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