News & Blog

News & Blog

Polyfoam XPS - The Build Up

SPECIFIER NEWSLETTER – ISSUE 7 – AUGUST 2021

It can be a minefield picking out the differences between construction products, especially with so many competing claims about what is the ‘best’ solution. Insulation solutions are the perfect example – all offer a low thermal conductivity, but exactly how low do you need to go?

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Polyfoam XPS - The Build-Up

SPECIFIER NEWSLETTER – ISSUE 2 – MARCH 2021

Welcome to The Build Up, the Polyfoam XPS email newsletter. This month we’re focusing on flat roof design and specification, including how to achieve inverted flat roofs that perform as intended. As well as the usual round-up of news stories that have caught our eye, this month’s resources include a new white paper we’ve put together.

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Flat roof

WHAT DO ARCHITECTS NEED TO KNOW ABOUT BS 6229:2018?

BS 6229:2018 Flat roofs with continuously supported flexible waterproof coverings. Code of practice describes best practice for the design, construction and maintenance of flat roofs. A flat roof is defined as having a pitch of no greater than 10 degrees to the horizontal, but the recommendations in BS 6229 can be applied to roofs with a steeper pitch.

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What is a water flow reducing layer (WFRL)?

WHAT IS A WATER FLOW REDUCING LAYER (WFRL)?

A water flow reducing layer (WFRL) is a loose laid membrane used as part of inverted flat roof constructions. It is installed over the roof’s thermal insulation layer, and below the roof covering. A WFRL is a barrier to rainwater, reducing the volume of water that can reach the waterproofed roof deck. It also stops fines from entering the roof system.

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