So that the basement fulfills all its functions, it must have tightness. Moisture getting into this room is unacceptable. After all, this is dampness and a fungus, which over time will fall into the house itself. But no tenant in his apartment wants to see this. The basement will be airtight if the base of the basement will merge with the foundation of the house, which will not allow rainwater to get into the room. Also an important factor is the depth of the basement. In large houses, he should have 3-4 meters in depth. This will help maintain the optimum temperature here, both in the summer and in winter.