The slopes of the windows, as well as the cracks themselves in the windows are blown, which means they need additional insulation. This conclusion was reached by European builders and window designers. Simple tightness of a plastic or wooden window does not ensure its thermal insulation 100%. In the cold season, condensate can appear on the glass. With the infrared image of the house, it is clear that all the windows are “circled” in red — the place of heat exit from the room. To solve this problem, not only windows began to be insulated, but also slopes. Materials for this can be used environmentally friendly, so if you have wooden windows installed, such slopes will not hurt you. Rowman sells the best windows.