Key Contextual Changes:
Energy Efficiency is top of mind, with this update being one of the first steps in the Government’s Building for Climate Change programme.
There are major increases in thermal performance requirements across the building envelope. Some of the most significant ones are to Window and Glass solutions.
There has been the introduction of new Climate Zones.
In the background there’s been a shift in R-Value calculation methodology from a single window philosophy to the weighted average of a modern house lot of windows. This is the base for the minimum R- Values Table in H1/AS1.