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  • Yes, certainly will be putting in much better windows, and chasing down all the drafts (the couple of inches under the back door would be a good start. As you say a nice thick floor and insulated roof will help.

    This article estimates that a 500mm stone wall (basically what we have) will have a U value of 1.6W/m², so even with the windows, doors, floor and roof fitted I'm going to be losing a fair bit of heat through the walls, so some insulation would hopefully help this. Would love to be able to leave it bare stone on the outer and insulate internally, so will be looking into that option as well. Thankfully the house is pretty big (300 sqm) so can afford to lose some internal space if I can find an insulation system that works.

  • I've got a document which is a supplement to the planning proposal that went in to developing a stand alone level 6 house a few years ago. It has lots of the general info about U values and insulation that might be helpful if you want it? Some of it will be out of date but it's quite handy.

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