U Values Data Sheet

The Granada Glazing System achieves excellent thermal insulation, with U-values as low as 1.1 W/m²K, based on calculations by Windata Ltd in accordance with BS EN ISO 10077-1:2017 and 10077-2:2017. Tested with timber and steel primary windows, the system’s performance demonstrates significant energy efficiency improvements when using secondary glazing with low-emissivity glass. Across configurations such as BVS, HS, HU-HD, HU-SL, LO, and TBVS, Granada’s systems reduce heat loss, enhance comfort, and support sustainable building performance.