Be located smoothly, which

— Two rails are nailed to the installed pillars — one below, the other at the top.

— Thin boards are nailed to the prepared basis, each of which, after fixing on the upper longitudinal rail, before fastening on the lower, should be checked for verticality by means of a plumb line. In this case, the vertical structural elements will be located smoothly, which will enhance the aesthetic perception of the finished product.