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  • 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.

  • Can't give you a definitive answer, but when we were looking nice doors were all composite or solid.

    I'm not sure there would be demand for ply faced composite doors. Either you want trad wood, or you want practical composite.

    Even composite places make their doors, so you could always try and contact them to get a blank door and face with ply.

  • 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

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