The Importance of Water Flow Reducing Layer in an Inverted Flat Roof

Description

This CPD article will discuss the Water Flow Reducing Layer as 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