The tree should breathe, t.

If an unpainted pine is used as a material for the manufacture of windows, then its vapor permeability coefficient is 0.05 mg/m × h × PA. This indicator indicates that moisture accumulates in the seams of a wooden window and wood fibers themselves. Increasing moisture content in the structure of the material significantly reduces its thermal insulation properties. To protect the wood from moisture available in the air and various kinds of precipitation, it is necessary to treat its surface with protective means. The tree should breathe, t. e., Along with the flow of moisture from the outside, it should evaporate from wood.