Ravatherm XPS X MK Ravatherm XPS X MK is a water flow reducing layer (WFRL) used in conjunction with Ravatherm XPS X 300 SL. A WFRL is a critical component of an inverted flat roof, minimising heat loss due to the rainwater cooling effect. This product is a polyethylene geotextile. Buy yours with us today at www.insulationbee.co.uk or speak to one of our friendly staff on 02038839057
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