Do I need in the basement produhi

In the debate about whether the air holes in the base, and whether they should close for the winter are needed, broken a lot of copies, but there is always a reason to continue the conversation.

The air holes in the base are required for ventilation of the underground space, which facilitates the removal of excess moisture from the socket.

Ventilation cap: Do produhi need?

Produhi usually do when construction of strip foundation. It would seem that the technology worked through. On FORUMHOUSE often appear themes to issues: the air holes there, and wooden beams and floor joists still rotting; moknet insulation or on the inner walls of the tape base formed by the frost in the winter.

chicken-A (user FORUMHOUSE):

- With the advent of modern materials and construction methods produhi become an anachronism. And if a closed underground additionally insulate properly, it will significantly increase the energy efficiency of the house.

Interests of the Western experience. In the United States, until recently, it was considered economically feasible to build houses with air holes and low underground, which were laid all the utilities.

In America, built about 30 million homes similar houses.

But in recent years overseas builders are moving away from the construction base with air holes. It turned out that in freely ventilated underground in most cases is still high humidity is maintained.

This is due to violation of temperature and humidity conditions. In the summer the warm air enters the cooler underground, and because of the difference in temperature water, contained in the air is condensed and falls in the form of dew on the inner walls of the cap and overlap. Over time, this leads to rotting structures.

Otsyrevanie underground space is for two main reasons:

1. Continuous evaporation of water vapor from the ground beneath the house. This contributes to a high water table or flooding cap precipitation;

2. Insufficient area of ​​the air holes. In accordance with the SNP 2.08.01-89 1.47, in cellars and basements walls without ventilation, the total area of ​​air holes should be not less than 1/400 the area of ​​underground or basement floor. And do produhi should be evenly distributed around the perimeter of the exterior walls of the basement or ground floor.

The minimum area of ​​the air holes equals 0.05 sq.m. Accordingly, ventilation cap for a total of 100 square meters require about 25 produhi 110 mm in diameter.

It is believed that the air holes need to be closed for the winter.

Igor3 (User FORUMHOUSE):

- I think that the habit of closing them in the winter there was more because of the possibility to store the products in the subfield. When fully open produhi potatoes and canned winter freeze and spoil.

Under the premises normally do ventilated cellar (ground or basement) with air holes on the outside and the air holes through the floor and the ventilation ducts in the walls. Summer venting occurred at the expense of the warm air inlet through the external air holes. Their winter is closed and the flow of air into the cellar goes through the holes in the floor. These holes are covered with small grids.

According SNP II-3-79, the difference between the air temperature and the temperature in the sub-surface underground overlap should not exceed two degrees. And in order to not produhi vymerz floor at the open in winter, it is necessary to properly insulate.

The minimum thickness of insulation in the floor (mineral wool) is 200 mm.

Because mougt these requirements not be complied with or performed with violations, then the next logical step is the construction of the cap without air holes.

Well insulated and isolated from the air underground for the entire year remains dry, warm, and it does not form mold.

How to make a closed underground

In relation to the closed underground teplotehnicheskom different from Ground floor only the presence of the air gap between the floor and the ground.

When closed the underground, due to the air layer, which is not open to the atmosphere, floors quickly warmed indoor heat. Therefore, the floor in the closed underground and in the permanent mode, you can not insulate. But the process of creating a closed underground can be divided into a series of sequential steps:

1.Obespechivaem foundation drainage. It facilitates efficient removal of excess moisture from the construction site, which reduces the humidity of soil in the underground;

2. Insulated wall cap outside. This keeps the heat in the underground;

3. Insulate blind area on the perimeter of the foundation. This reduces the heat leakage through the lower part of the foundation. Besides, warmed blind area reduces the forces of frost heaving, acting on the foundation.

4. Paroizoliruem primer in the socket, i.e. forced to block the flow of moisture from the soil in the underground. For this Stel ground thick, not less than 150 microns, a polyethylene film. It should be laid with an overlap and mandatory sized joints. For grade film can pour concrete screed "lean" (2-3 cm thick). The ends of the films (20-30 cm) plant for foundation wall and the strip presses on the dowels;

5. Mount the underfloor space ventilation system;

chicken-A (User FORUMHOUSE):

- the air holes in the basement is best to replace the exhaust riser, going inside the house from the underground to the roof or attic, and supply opening somewhere in the floor non-residential premises of the vestibule, etc ..

Vent standpipe can be made from a tube with a diameter of 50-80 mm. Because riser connects the underground premises and cold attic, then the difference in temperature in the riser is created by a small rod, intake air from underground. The natural circulation subfield well ventilated.

Glebomater (User FORUMHOUSE):

- I would make ventilation holes in the corners of the house and chimney set at the center. In my case plinth ventilation is ensured by oven heating. The underfloor space is combined with the living quarters, and air for the furnace is taken from under the floor.

Thus, warmed and closed underground space may become one of the componentsenergy-efficient homes.

On FORUMHOUSE conducted hot discussion if necessary base with air holes and collected the opinions of owners Ground floor. Read how to repair communication under the slab foundation. And in this video explains how replace rotten lower crown in a wooden house.

Discuss the article and read other materials devoted to country life you can on the websiteFORUMHOUSE.

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