Wall insulation with foam allows you to create a pretty good thermal insulation. It is best to glue the foam on the outside, after calculating the required thickness of the material, which will allow you to keep warm in the house even in the most severe frost.
When choosing polystyrene foam for thermal insulation, it is necessary to remember that ordinary white and color differ not only in appearance. One centimeter of colored polystyrene is five times higher than ordinary white polystyrene of the same thickness. When determining the thickness of the foam for insulation, you should not start from the statement that the leaner the better. Extra centimeters are a waste of money on the acquisition. Therefore, everything must be approached wisely. Of course, too thin a layer of material will not protect enough wall from freezing and may cause condensation. Therefore, it is necessary to rationally and competently approach the issue of determining the thickness of the foam layer on the outer side of the wall of the house.
Firstly, it is necessary to determine such a value as heat resistance, which is constant, but different for each region. So for the central part of the country, the thermal resistance of the walls is 3.5 square meters per K / W. For comparison, the thermal resistance of the ceiling is twice as high. Thus, the required foam thickness is defined as the product of the thermal resistance in the region and the thermal conductivity of the foam. The coefficient of thermal conductivity of the foam varies from 0.031 to 0.041 W / m * k. You can clarify this value with sellers.
Further wall insulation do it yourself must be carried out in compliance with certain rules. First, you need to level the base, dry it and remove any dirt. The primer will not be superfluous in the case of processing the walls. In addition, remember that smooth and glossy walls painted with oil paint must be additionally incised with an ax or perforator for better adhesion. Remove soot, grease, soot must be a special solvent. You can level the surface using any starting putty.Secondly, you should not think that the most progressive and new adhesive mixtures will keep foam on the wall for a long time. In any case, it is necessary to further strengthen the dowels.
The process of repairing a house is quite simple. An adhesive mortar is applied to the wall with a notched trowel and the foam sheet is pressed quite tightly against the wall, leveling through a wooden beam. Hammering dowels is best done with a heavy but rubber mallet.
In the event that there are bumps on the walls with a depth of more than one centimeter, then it is necessary to apply glue both on the foam sheet and on the wall. Otherwise, the glue will not stick to the surface and the foam sheet will fall off at the most inopportune moment. In order to more evenly apply glue to the surface, it is best to keep the foam horizontally, checking the depth of the level.
In order to make the facade of the house look aesthetically pleasing and the polystyrene lasts for many years, it is covered with cement mortar on top. And finally, they paint at the request of the owners of the house.
Walls thus insulated from the outside do not need to be insulated from the inside. Therefore, the precious space of the house is saved.