The temperature difference leads to the formation of water drops on cooled layers of the roofing. The so -called steam condensation occurs. So that moisture does not damage the insulation from the inside, use polyethylene foamy heat insulator. This universal material is convenient when carrying out complex insulation work, has excellent properties: it is easy to cut, it is easy to glue. In addition, foamed polyethylene, due to its granular structure, is a universal material that isolates sounds, does not pass water and heat. This material is strengthened immediately on the basis of the roof. For its installation, a stapler is used. Pre -prepared layers of foam are interconnected using adhesive tape, which has adhesive properties on both sides, for reliability of insulation from steam and water. The connection is carried out by joining the canvases of polyethylene foam or imposing them one on the other (overlap). Also, to release vapors and the movement of air between polystyrene and finishing materials, they leave a small distance from 15 to 20 millimeters.