The Wood Window Alliance unveiled new life cycle analysis at Ecobuild that claims ‘carbon negative’ status for some of its members’ products.

The industry marketing campaign – exhibiting under the banner “Wood Windows CO2T Less” – said research it commissioned from consultants Davis Langdon provided the first “empirical measurement” of the embodied carbon in a wood window.

The study looked at the environmental performance of products rated A to C under the British Fenestration Rating Council scheme and also took forestry waste practices and landfill carbon emission estimates into account in its assessment.

“All WWA windows use timber sourced from sustainably managed forests that sequester more carbon than they produce and, despite carbon emissions from transport, production, maintenance and end of life [disposal], they are still carbon negative,” the WWA stated.