Vapor barrier in a wooden house is needed to exclude dampness and moisture from residential and non-residential premises of the whole house into thermal insulation materials ... Insulation, in contact with water, ceases to fit snugly enough to the frame, and loses all thermal insulation qualities and properties. If we consider that the wall of a frame house for 75% of the total volume consists of heat-insulating material, then you need to pay special attention to the main points related to installation and operation, the choice of the necessary vapor barrier.
You should be aware that the vapor barrier membrane itself does not completely isolate the walls of the frame house from moisture and moisture penetration, the membrane structure is porous and multilayer, and water vapor freely penetrates through it. It can reduce the rate of penetration of moisture and steam, but will not exclude this process forever! If we consider the membrane in detail, then one of its sides is smooth, and the other has a rough surface. This is provided so that dampness and moisture settle on such a side of the membrane and evaporate freely from it in the future. The vapor barrier of frame walls occurs with the smooth side to the insulation, and the rough part goes into the room.
For a healthy and optimal microclimate in the house, internal circulation of fresh air is needed, and it goes not only through windows, doors and ventilation, but also through walls.
That is why all walls are breathable - even such a material as concrete has a certain vapor permeability coefficient!
All vapor barrier membranes can be divided among themselves according to their properties and characteristics. Which is better? For rooms with a humid environment and elevated temperatures (sauna, bath), membranes of a different quality are required, in contrast to those used in standard rooms and rooms.
The air contains a certain amount of moisture, it all depends on the climatic zone, temperature regime, and the purpose of the dwelling. For example, a steam room in a bath, hot air saturated with water vapor significantly affects the walls, and if you do not dry well and ventilate the entire bath after water procedures, you may have quite serious problems with the building of the bath.
This happens because moisture and dampness, locked in a room, begin to look for a way out, and not finding it, they begin to penetrate the walls, and as we already wrote above, even concrete has a certain degree of vapor permeability.
And dampness and moisture, plus a high temperature - these are ideal conditions for the emergence and development of harmful bacteria, as a result - mold, blue on the walls, and constant dampness. You can read about how to get rid of mold here (https: // domsdelat.ru/poleznie-soveti / kak-izbavitsya-ot-pleseni-v-karkasnom-dome.html)
Sometimes this can happen in the house, for example, in the bathroom, laundry room or bathroom - these are rooms with high humidity, after which comes the kitchen and dining area, living rooms, corridors and hallways. Increasing the amount of time you wash, shower, cook, or even just stay in the house affects the amount of moisture in the air.
Which vapor barrier to choose for the walls of a frame house is up to you, but it will directly depend on the purpose of your living space. For example, if you want to build a summer cottage or house that will be used only in the summer, or vice versa, a full-fledged house for year-round living.
Vapor barrier membranes are used to protect the walls of a frame house from moisture vapors and dampness coming from internal living quarters, they significantly slow down the penetration of moisture and steam into the walls, but do not completely stop this process, to ensure an optimal and healthy microclimate in home.
Errors during installation and installation of vapor barrier
At first glance, there is nothing complicated when installing and installing a vapor barrier membrane, it is neatly attached to the racks with a construction stapler, or bars, then carefully glued with mounting tape or mastic. But most modern builders are not able to work accurately and with jewelry.
Usually, the work takes place with the appearance of any folds, cracks on the membrane, and instead of the necessary adhesive tape, the membrane is sealed with a standard packing tape. Or they can even mount the vapor barrier on the other side. You will be able to notice the result of such unfavorable work only after 2-3 seasons, when the already wet insulation in the wall of the frame house ceases to work correctly.
In this case, moisture vapor and dampness passing through the wall form condensation on the membrane surface, and this leads to dampness of the material ..
. Outside the walls of the frame house, a wind shield is mounted, and, unlike a vapor barrier membrane, it perfectly passes moisture and damp vapors.
Heaters such as polystyrene, ecowool and polyurethane foam allow you to apply this solution. But in this case, it is necessary to provide sufficiently good ventilation of all rooms to remove excess moisture. The best option would be to install a forced ventilation system.
This effect is mainly found in damp or technical premises, when all walls are finished with special plastic panels, tiles or oilcloth, and other poorly breathable materials. As a result, moisture and dampness is trapped between the two materials with little vapor barrier.To avoid this effect, use a special air gap between the wall and the finishing material, as an example, pre-sheathe the bathroom with slats, and only after that attach the finishing material to them. Or do not install a vapor barrier in these places at all, so that dampness and moisture can easily leave through the walls, but if high humidity and dampness are constantly present, there is a risk of it accumulating in the wall. This solution is usually used for temporary use of buildings, summer houses and summer cottages, etc.
Today day there are two main design schemes for vapor barrier walls of a frame house.
Let's consider which of these design schemes is more correct.
There are many opinions on this matter.
Firstly, many building materials that are used in Canada or the USA cannot be found in our market, or they are sold at a huge price. Secondly, the difference between building materials brought from abroad and domestic manufacturers can be significantly huge!
Provided there is sufficient ventilation to remove excess moisture and dampness contained in the air, the structural schemes of the wall are not so and important, because the correct vapor barrier of a frame house is just additional insurance. The structure of the walls of a frame house without a certain air gap, it is advisable to use it for the construction of those buildings that will be operated only in the summer or used temporarily - summer cottages, dining areas and guest houses, various workshops, and car parking. But in this case, you need to make ventilation, or at least put a ventilation box, be sure to provide for outputs from the bathroom, kitchen area, and technical rooms.
And the wall structure of a frame house with an air gap is suitable for houses that will be used constantly.
Because in this case there is a risk of high humidity and dampness inside the residential building.
And in conclusion, we note that vapor barrier films or membranes are produced by a number of construction companies, but the most famous manufacturers are TechnoNikol, Izospan, Tyvek.
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