LRWA VIEWPOINT domestic properties with small flat roofs, best suited to less than 100m². This is because the system always requires the application of a quality plywood or oriented strand board substrate – but can also be applied to other surfaces such as concrete with the use of primers if required. Contractors would typically use GRP for foot-trafficked areas such as walkways or balconies, and is also quite popular within local authority frameworks as well as garage roofs, outhouses and housing extensions. The installation of GRP includes preparing and laying the substrate to form a structurally sound deck. Then, preformed edge trims are fitted around the perimeter of the roof, at any significant junction or change in pitch. The waterproof laminate of a GRP system is applied onto the deck, made up of roofing resin combined with a catalyst which is used to saturate a reinforcement mat – typically a chopped strand mat (CSM) material. Once the laminate has cured, a coloured topcoat which is mixed with a catalyst is applied over the surface using a brush or soft roller. As with any liquid waterproofing solution, one key consideration for contractors before specifying a GRP system is always checking the manufacturer has third party accreditation. This is especially apparent for GRP systems as there are a number of new manufacturers on the market which may not have the appropriate certifications. Flexible Polyester This technology consists of an unsaturated NO PROPANE NEW Electric Heated Hot-Melt Cooker 066 MAY 2017 RCIMAG.COM polyester resin reinforced with either fibreglass mat or polyester fleece. Flexible Polyester is very fast curing which allows for quick walk-on times. These systems can be applied to a wide range of substrates and are equally suited to refurbishment or new build. Various colours and finishes can be incorporated with Flexible Polyester to suit the needs of the client, and thanks to its tough finish, Flexible Polyester can be used for balconies as well as roofs. The polyester resin incorporated within the system must be specially formulated to provide a high degree of flexibility and elasticity combined with fire performance. This technology can be used on all sizes of roofing projects and because of its component qualities, it is quick and easy to apply. What to specify? No matter which liquid waterproofing technology is specified, quality systems that are fully accredited will offer a durable, UV-stable, quick, easy and sound waterproofing solution. They should also have appropriate third party accreditation such as BBA Certification and / or BDA Agrement (Kiwa). The LRWA consists of many quality manufacturers offering varying liquid waterproofing technologies. With our strict membership criteria ensuring manufacturers also offer training and technical support to contractors, impartial organisations such as ourselves can be a useful resource for guidance and advice. www.lrwa.org.uk Above: Flexible Polyester can be used on all sizes of roofing projects and because of its component qualities, it is quick and easy to apply 1.5 drum, silent-running with portable generator or site power. For sites that prohibit liquid propane gas. FOR HIRE Fully serviced prior r to to delivery delivery. Full operator training available.
RCI May 2017
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