Environmental construction products supplier Green Building Store (GBS) has launched two ranges of windows and doors.

The ENERSign range is imported from German firm Pazen, with the frames constructed from a durable fibreglass exterior and timber on the inside face. Products feature triple glazing, BASF Neopor foam insulation and airtightness design detailing to give a whole window U-value of 0.65 W/m2K.

Ecopassiv is the first range of Forest Stewardship Council-certified timber windows and doors suitable for Passivhaus buildings in the UK. The products incorporate an insulated frame with a thermal break, which ensures a whole window U-value of 0.75 W/m2K.