Compact cavity wall insulation from Recticel Insulation which achieves a U-value of 0.18 W/m²K in new-build constructions has won BBA approval.
The accreditation (02/3908) is for Recticel’s premium PIR Eurowall+ product which was launched in the spring to help architects and specifiers meet current Building Regulations without them having to amending existing designs.
A U-value of 0.18 W/m²K can be achieved using 90mm Eurowall+ within a 100mm cavity, meeting the requirements of Part L1A England 2013 and Part L1A Wales 2014, meaning that existing designs can be retained to avoid reducing room sizes which could make the properties less attractive to prospective buyers.
Existing designs can also be retained without increasing building footprints which has the potential to reduce the number of properties on a site, making development less attractive for house builders.
Also manufactured at 75mm for 85mm cavities, 115mm for 125mm cavities and 140mm for 150mm cavities, Eurowall+ features a unique tongue and groove joint on all four sides to ensure the boards lock tightly together to minimise heat loss through thermal bridging. As well as improved air tightness, this also offers additional protection against wind-driven rain.
The high performance boards also feature new facing technology which reinforces their structural integrity. One side uses a low-emissivity facer, the other an alkali-resistant facer.
Eurowall+’s compact design leaves space for conventional bricklaying techniques, with enough room to ‘roll’ the outer leaf bricks into place so that bricklayers’ work takes the same time to complete.