The logic of timber housing is both simple and effective.
The timber beams are placed in horizontal interlocking layers lined with insulation materials or packing. Externally where the walls meet and form vertical ledges, 16mm vertical metal rods are bored through all the interlacing layers for the whole height of the wall. These are then tightened into place.
Between the timbers a special insulation is fitted to achieve air tightness, also a 5cm stone-wool insulation is used for heat isolation.