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There are a few potential issues with retro fit cavity insulation. Driving rain soaking in and not ever drying out, cold spots where they can’t get the stuff in causing condensation issues, other things I’ve forgotten.
Hopefully the heat pump folk will be using a reputable firm, but give it a Google and ask them a couple of questions ‘this bloke on the internet said I need to be careful of cold spots, is that right?’. If they’re good they’ll have the answers.
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Maybe have a quick search of the different types? Some can be removed, some can’t. Suspect mix on site is the later
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Get icynene if you can
Hefty
Howard
gillies
@dbr
ASHP company is organising spray foam cavity wall insulation as part of the install. What should I be looking out for? Open-cell?
Cavity is 80mm wide and AFAIK clean dry and good to go.