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I thought you could just get an external fire door blank and add a thin veneer of marine ply. But then I looked up fire doors and somewhat counterintuitively they have very poor thermal insulation!
By the time you’re buying a specifically good insulating blank it is probably more sensible to make it yourself
t.o.
dbr
Does anyone in the UK make a completely plain flush exterior door with ply faces and a PIR / foam core for insulation purposes? Googling & phoning yields nothing, all computer-says-no plastic composite or solid ply.