Ravago Building Solutions Water Flow Reducing Layer RIBA Accredited CPD Module

This CPD article will discuss how a Water Flow Reducing Layer, such as Ravatherm XPS X MK, is central to the thermal performance of an inverted flat roof – minimising heat loss due to the rainwater cooling effect. It explains the crucial role they play and how to properly account for their presence in U-value calculations. By the end of the CPD you should have a greater understanding of:

  • Core principles of an inverted roof
  • The difference between declared lambda and design lambda
  • The role that a Water Flow Reducing Layer (WFRL) plays in an inverted roof
  • How to perform a more accurate U-value calculation for an inverted roof taking into account moisture conversion factor