Is laid on

For thermal insulation, take mineral wool or polystyrene foam plates (aka foam). On the facade you make a supporting frame from the boards, a vapor barrier film is laid on them, and a layer of insulation on top of it. The frame house will be enough for one layer, the log -shaped one may need the second. In this case, it will be necessary to mount another frame, transverse. Just do not forget to leave a gap for ventilation under the facade cladding, and the lower part of the insulation is the gap. This will ensure the circulation of air, which will take out the excess moisture.