The underground space of a private house must be ventilated. This is especially true for houses on strip foundations. In modern cottage construction, the option of a strip foundation with an open subfloor is practically not used. Most often, the space of the subfloor is covered with sand or expanded clay. House floor ventilation must be equipped in accordance with the existing SNiP.
Types of ventilation of the subfloor of the house
There are two types of ventilation in the subfloor of the house: natural and forced.
Natural floor ventilation in a wooden house is the cheapest method. Equipped with air vents. If the house is built on a hillock, this is often enough. However, how to ventilate the subfloor of a low-lying house? The ducts are attached to the windward side.
Forced ventilation in the basement of a private house is provided by installing several fans.
Requirements for ventilation of the subfloor of the house
As a rule, when erecting houses on a strip foundation, the diameter of the air vents is made too small, therefore, high-quality ventilation in the underground of a private house does not work. So, to provide ventilation in the subfield of a house with an area of 100 sq. meters, it is necessary to make twenty-five round airflows with a diameter of 10 cm each. Most often, the owners are satisfied with only 5 - 7 holes, therefore, before making the ventilation of the subfloor, the area of the vents should be calculated.
According to the requirements of the Building Norms and Rules for residential buildings, in the underground technical and basements that are not equipped with ventilation, airflows with an area of 1 \ 400 of the area of the room should be made.
You need to distribute the holes evenly around the entire perimeter of the building. The area of each hole is from 50 sq. centimeters. If the area is unfavorable in terms of the level of radon in soils, the area of all airflows should be 1 \ 100 of the area of the room. According to international building codes, for ventilation of the subfloor of the house, the area of the holes should be calculated on the basis of 90 sq. centimeters by 14 sq. meters of the foundation area. From the corner of the foundation to the vents, there should be no more than 90 centimeters, otherwise there will be windproof corners in the subfield.
When you can do without fumes
According to international building codes, ventilation of the subfloor of a wooden house can be omitted on purpose if:
- The soil in the subfield is covered with a vapor-proof material, which is overlapped (15 cm), and its edges are glued;
- There is ventilation in the subfield, providing an air supply of 500 ml. per second for 5 meters of basement area, and the foundation is insulated;
- The subfloor communicates with the upper rooms and is used as a warehouse.
