If, in order to save a poor -quality or vapor -permeable material, a greenhouse effect is formed, that is, the cooled air will be detained in a layer of insulation and as a result the condensation of moisture is formed. This will freeze moisture in the walls of the house, which, after thawing, provoke the process of decay of the tree. To prevent this from happening, it is necessary to use all the layers of insulation described above.