Rabbeted boards provide good thermal insulation and generally are already on sale with antiseptic processing. In addition, after laying of the milled boards on a surface of a floor there are no tops of nails or self-tapping screws. They are made in the corresponding size therefore there is no need for scrupulous adjustment, contrary to ottortsovanny boards.
Before laying a timber floor from a rabbeted board, carry out sawing. Saw off necessary length, keeping an interval of 2 cm near external walls, 1 cm near the internal.