In the United States of America, in the vast majority of cases, siding is fastened without forming a ventilation gap using a crate. Very often, residents of an overseas country fix it directly on OSB. But in Russia, this approach is considered a real marriage and the height of negligence when performing construction work. And here a natural question arises: is a ventilation gap needed in principle?
We sheathe the house with siding, and immediately the question arises of creating a ventilation gap. Prices for materials alone in our time "bite". So, for example, a house with a wall length of 20 meters and a height of 3.5 meters will require spending only on an aluminum profile with fasteners up to 25 thousand rubles for each wall. Thus, in total, the crate of one, and not the largest house, can cost 100-120 thousand rubles. Looking at such figures, many citizens begin to believe that if you make a high-quality vapor barrier, then no ventilation gap will be needed.
Actually it is not. Any siding manufacturer will indicate in the instructions that it must be mounted strictly on the crate. The metal frame, in turn, should be installed at a distance of 30-40 mm from the wall of the house. If these simple rules are neglected, then all moisture (condensate) will inevitably accumulate on the wall of the house, which will lead to rapid deterioration of the material, the appearance of mold and fungi. If everything is done correctly, then the condensate will accumulate on the siding, which is not afraid of water.
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In the bottom line, one thing can be said: you should always do according to the instructions, and not engage in amateur performances. When buying siding, the same document will always be attached to it. Building codes are invented for a reason, and even more so by people who are not stupid. As for the question of why this is not done in the United States. There is exactly one answer here: a different technical regulation. Moreover, the crate is actually made in America, but not in all places. And all because the climate in the United States is still not the same as in Russia.
If you want to learn even more useful, then you should read about how to legally dissociate yourself from a neighbor with a blank fenceeven when he is against it.
Source: https://novate.ru/blogs/070122/61778/