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This is super useful guidance thanks! So it’s as “straightforward” as foam on the backing, sealant round the edges and then fixings.
We’re cavity wall as well and may get cavity wall insulation but I do feel adding internal insulation will really help regardless and don’t might the loss of space at all.
In Scotland, freezing house / walls and a 5 year old who wants to be in our bed every night as she’s cold.
“ And good luck finding someone that can do lime render and insulation.”
Friends of mine are self building a hempcrete house, has membrane free walls/breathable with very thick insulation. The base is not concrete but some kind of waste cinder product.
They got messed around for a year by one of the only people who was doing hemp/lime render at the time and then covid came along, it’s only now getting near completion!?