The Liquid Roofing and Waterproofing Association (LRWA) has launched a number of new guidance documents for specifiers and contractors responsible for the design and installation of inverted roofs.
The free technical downloads include ‘Guidance Note 14: Best Practice for the Installation of Water Flow Reducing Layers’, and ‘Guidance Note 15: Clarification of BS 6229:2018’, regarding the thermal performance of inverted roofs and blue roofs.
Both have been produced by a new LRWA Specialist Technical Group (STG), consisting of experts from across the waterproofing, insulation and blue roofing industries.
In addition, ‘Guidance Note 7: Specifier Guidance for Flat Roof Falls’, has been updated to include advice on designing falls in line with BS 6229:2018 – the British Standard code of practice for flat roofs with continuously supported flexible waterproof coverings.
Sarah Spink, chief executive officer of the LRWA, said: “Since the publication of BS 6229:2018, there have been lots of questions about some of the advice relating to inverted roofs’ thermal performance. The STG was convened by the LRWA to address any issues raised and this had led to the publication of our new guidance notes.
“Guidance Note 15 seeks to clarify key points in the Standard, including the proposal to increase insulation thickness by 10% and how U-value calculations should be carried out. Also linked to BS 6229:2018, Guidance Note 14 offers installers more detailed information on how to ensure a water flow reducing layer (WFRL) performs correctly.
“These resources provide all those involved in inverted roof design and construction with comprehensive advice and explanations to help ensure best practice is followed.”
The LRWA’s new guidance notes can be downloaded free of charge here.
