We are in a 1907 double brick federation house on a limestone foundation with a badly built 1980s extension on a concrete slab at the back. It has badly sealed doors and windows (single glazing), limited window fittings, two electric fans venting into the attic.
We initially put Rockwool in the attic and foil under the tin roof. Currently, we are contemplating cavity wall insulation in and closing air vents at the top of the wall, before we consider upgrading the windows (which we expect to be more expensive).
Does this sound like the right order in which to do things?
Separately, we are concerned about the air quality of the house due to recurring sore throats and unwellness. Are you able to provide any advice on this?
If you have already installed insulation and reflective foil under the roof, it is very likely that external wall insulation will be the next thing to do in order to improve the thermal performance of your home.
I agree that you should do this before upgrading your windows, as you will experience greater heating gains/losses through the walls because they typically represent a larger exposed surface area compared to the window area.
