It is good when the summer cottage has its own bath. However, as soon as the owner acquires such a building, he may face a very unexpected problem. Namely, with the fact that from under the floor begins to pull so noticeably cold. You should not despair in this situation, as this problem belongs to the category of "solvable".
What's the first thing to be built on the site? Many will say: toilet. And they will be right in their own way! However, according to the precepts of the ancestors, the first building on the site must be a bathhouse. The construction of a bath is fraught with many pitfalls. There are many secrets and subtleties that you should know and take into account. At the same time, many, even quite experienced builders of baths, are faced with the fact that after the construction of the structure, cold air begins to draw from under its floor.
This problem is solved quite simply, namely, by creating a competent ventilation system not only for the bath room, but also for the underground space. In the bathhouse itself, there must be a ventilation pipe through which hot air will flow, and with it the dampness from the bathhouse will leave. The latter becomes the reason for a significant decrease in the air temperature in the room after the oven has cooled down. So the ventilation pipe must be in the washing compartment.
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It is imperative to organize a draft under the foundation of the bath. For this, special holes are made in the lower part of the building. In this case, there must be doors on the gaps. They are closed before the beginning of the bath procedures and open after their end.
Once the ventilation issue is resolved, there remains another important problem to overcome - removing water from the floor. To do this, you need to make the bath floor in the right way. There must be special holes or even slots in it so that the water goes into the underground space. This is to protect the tree from rotting, and the bath itself from the cold draft. The best solution is to create one or more holes with concrete bowls underneath to collect and drain water away from under the floor.
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A source: https://novate.ru/blogs/020620/54751/