066 RCI 0417

RCI April 2017

LRWA VIEWPOINT 50 years ago and has seen many advancements during this time. SEBS polymers are used in the refurbishment and waterproofing of both metal and asbestos profiled sheets and as a waterproofing solution on flat roof substrates such as bitumen sheeting, asphalt, single ply plastics and concrete. This technology produces an elastomeric roof coating that combines long lasting protection against water penetration and ponding water, to give an extended durability and service life. It has excellent water resistance qualities and is often specified for roofs which have a lot of standing water. The elasticity within the product enables it to cope with the expansion and contraction that occurs in different substrates including bituminous, plastics, EPDMs, metal, asbestos, timber and concrete. SEBS is a single pack system, which is attractive to many contractors as there is minimal loss or wastage, and part-empty packs of product can be used on the next project without compromising the waterproofing performance. During application of a SEBS system, certain substrates need priming to ensure adhesion of the base coat which includes the embedding of the reinforcement layer. As well as adding strength and puncture resistance to the system, this reinforcement ensures that an even and required film thickness is achieved. A final topcoat is applied to complete the system. 066 APRIL 2017 RCIMAG.COM A question of choice Liquid roofing and waterproofing technology is rapidly evolving, with more investment being made into research and development of products all the time. Whilst many liquid manufacturers have offered a system for decades, developments to systems continue to be made to ensure optimum performance for the end user and contractor alike. Liquid waterproofing membranes can be tested to European Technical Approval Guideline 005 Liquid Applied Roof Waterproofing Kits as a standard, and there are other third party testing and approvals including BBA Certification and current BDA Agrement (Kiwa). It’s always advisable to check liquid systems have this certification before being considered for specification. Polyurea's main, major benefit is its quick curing qualities It’s a matter of choice when it comes to liquid roofing and it is always advisable to consult an impartial, specialised organisation such as the LRWA, for guidance on liquid specification. Free tools such as the product selector on the LRWA website, for example, ensures contractors and specifiers can make an informed decision. www.lrwa.org.uk Terry Wain is technical secretary for the Liquid Roofing and Waterproofing Association (LRWA). The LRWA consists of the leading manufacturers of liquid applied waterproofing, approved contractors and related materials suppliers


RCI April 2017
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