If the sauna is not built on the entire area of the room, then where there are no walls, we put a couple of racks from a board of 100-120 cm wide at the corners of the wall under construction. The boards should be higher than the upper beam of the strapping by 5 cm. We fasten the floor as follows. In the floor, drill two holes, insert dowels. We drive 2 nails (120 cm) into the board on a width equal to the width of the holes in the field. Then we fix the board, inserting the nails into the holes.