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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

  • I’ll probably just sandwich a board of rigid insulation between two 18mm marine ply, solid wood border all the way around.

    I wonder if building control are going to start failing every solid wood door soon. Doubt it, but nothing out there is coming close to a 1.4 u value.

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