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
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