Internal insulation and vapor barrier under plasterboard

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pitched roof with a metal covering (seamed roof, corrugated sheet or metal tile);
pitched roofing consisting of a non-metallic covering (slate, “soft” bitumen roofing, natural tiles);
walls with external insulation;
attic spaces, as well as basement floors;
baths and saunas.
Although many are quite skeptical about the need for vapor barrier, you should not neglect it. Of course, without it, the repair will be a little cheaper. But installing a vapor barrier will allow you to avoid condensation. The presence of condensation in the house during the cold season negatively affects the appearance of the repair. Because of it, wallpaper can peel off, paint can deteriorate, and mold and fungi can appear in places where condensation forms. Vapor barrier will allow you to keep your house warm and finally get rid of condensation.



In addition, such a film will increase the thermal insulation capabilities of the ceilings, which, again, will only play into your hands.

The procedure for installing vapor barrier under drywall is fusion data easy, and the material itself is not very expensive. Therefore, this procedure is still worth doing, since the advantages from it will be much greater than the disadvantages.

Many people believe that if the house has been insulated from the outside, then internal vapor barrier is not needed. But this is not entirely true.

Carrying out internal vapor barrier will help you:

eliminate the deficiencies of external insulation;
increase the efficiency of external insulation;
make the room warmer;
prevent the appearance of mold and mildew. This is especially true for window openings;
reduce heat loss, which will allow you to save on heating, the prices of which are constantly rising.
Among the relative disadvantages of insulation and vapor barriers installed under drywall, we can mention a slight reduction in free space in the room. But drywall, in most cases, already requires the installation of frame floors, which leads to a reduction in space. So if you decided to do this at the very beginning, it will be much more effective to use the space under the sheets to install insulation and vapor barrier film. This way, you will kill three birds with one stone: you will occupy the free space under the sheets, additionally insulate, and also prevent condensation.