• I saw some new dwellings being built in northern Finland and the walls were incredibly thick with insulation, the windows are often triple glazed as well.

  • Friend of a friend built a house in Germany, >300mm thick solid timber walls. Nice place, not cheap.

  • I reckon the walls I saw were at least double that (but it can get down to -40 or lower there). The houses I stayed in over there were incredibly warm with no drafts.

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