dwhhhhhhhhhh

This is so similar to the issue which we have been struggling with on our extension. We had some work done in 2020 and have had issues with cold in the new space since completion. I originally put it down to lots of glazing, large space to heat etc but after realising 2020 space was always significantly colder than 1920s original building I started more detailed investigation. We’ve found holes behind kitchen cabinets, missing insulation, poor installation of insulation and many other things. In March, we actually took out the entire kitchen, lifted the floors and refit the under floor insulation. Thermal imaging confirmed that that was an issue prior to doing this - which was a massive job. Here are some pics of what we found - gaping holes open to the outside letting cold air directly into the space. The only insulation over those parts of the floor was effectively the cork laminate tiles. When we did the reinstatement work, we installed a best-in-class air tight system with use of FM330, airtight membrane, and airtight tapes at joints (including skirting.) I have only done under the kitchen. There is a small (12m2) are in the space which I now need to do before winter kicks in proper. I’m now thinking I might need to inspect the joints between the walls and roof to check whether there are gaps where the insulation should otherwise overlap. I might come back to ask for advice.