An integrated external building envelope, delivered by ICF-Tech walls, Sheerframe windows and Masterdor doorsets, is being used on 12 Code for Sustainable Homes level five dwellings for Woking Borough Homes

Contractor William Lacey worked closely with the technical team from ICF-Tech to design homes that are being constructed using insulated concrete formwork, which is claimed to offer good structural strength, thermal performance and airtightness, along with good levels of acoustic insulation.

With U-values as low as 0.11 W/m2K, air infiltration as low as 0.74 m3/m2/hr @ 50Pa and a Y value (thermal transmittance through junctions) of just 0.04, code level six and Passivhaus standards are made possible, and repeatable, using the system, the company claims.

The system is also designed to accommodate high performance Sheerframe HED casement windows with a U-value of 0.8W/m2K, while bespoke high-performance thermal doorsets from Masterdor complete the envelope.

Litchfield Group