Browse Forums Heating, Cooling & Insulation Re: Lightbridge “low E” glazing as an upgrade 4Mar 24, 2023 11:14 am What are the u-values of your double glazed windows? There can be very poor double glazed windows. You should be aiming for a u value at least under 3 (ideally around 2). I'd upgrade ceiling insulation to R5 or R6. The real problems might be with your design anyway. If it's not too late, you can hire an energy assessor to model your plans and run through why your rating is so poor. They can give you best bang for buck recommendations on how to improve. This is one of the reasons I decided to go overseas for my double glazed windows. As the builder indicated, he's worked on many upmarket builds, these were the most well… 13 19582 For your reference Performance Labels: Window assemblies in housing, except timber windows, must be labelled so the label can be seen when it is in situ. For timber… 6 10140 4 6315 |