New figures show that using low U value windows significantly reduces Dwelling Emissions Rate (DER) and heat energy loss, benefiting homeowners and the planet.
UK window systems company L.B. Plastics commissioned a study by a major UK housebuilder into the effect of installing Sheerframe HED 0.8Wm2K zero carbon windows into a typical two-bedroom semi-detached home.
Applying the Government’s standard assessment procedure for the energy rating of dwellings (SAP) they demonstrate that installing 0.8 U value windows reduces the whole house CO2 emissions (DER) by 8.0% compared to windows with a 1.8 U value and improves heat loss by an impressive 11.54%.
Graphs for CO2 emission reduction and whole house improvement to heat loss demonstrate a steep improvement gradient as the u value of the window reduces.
Says L.B.’s Mike Butterick: “There are those in the windows industry who suggest that demanding 0.8 windows is ‘over-specifying’.  This research shows such a view is nonsense.  As builders strive towards delivering zero carbon homes, ensuring the optimum performance of the fabric, including the windows, is vital.  Sheerframe HED demonstrates how traditionally-styled high-performance zero carbon windows are available, cost-effectively, right now.”
Where zero carbon windows replace single glazing in social housing refurbishment, the effect is even more astonishing with whole house heat loss improvement of over 20% and CO2 emissions reduction of 26%, making the change to 0.8Wm2K one of the most cost-effective answers for existing housing stock.
Like all Sheerframe products, HED windows are 100% recyclable and, because they use only calcium organic stabilisers, are entirely lead-free.  The products are already being widely specified in Code Level 5 and 6 building schemes across the UK.