First-time poster here looking for some advice before I embark on upgrading the insulation in the loft space of our single-storey extension! Current insulation in the loft is a single layer between the ceiling joists, and I'm looking to upgrade by putting a second perpendicular layer on top.
A question I have is about a gap of around 2 inches between the first joist and the original brick wall of the house (where the extension starts). Should I insulate this gap or will it create a bridge between the wall and joist for moisture? It's not an external wall as it's between the house and the extension, but it is a solid brick wall. If I should insulate, can I use cuts of the fibre-roll or is expanding spray best?
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