Skillful builders in the United States cover insulation with polyethylene, I understand why we are not so accepted

Recently I learned that in America, as well as in Canada (about other countries I do not know for sure) the insulation is closed with a conventional plastic film. And we, as confirmed by experts in the industry, this is not in any facility. Why? Polyethylene insulation Very ergonomic and profitable, but there are nuances. Which ones, I will tell you in this article.

The West is ahead of us. After all, there is practically no ordinary film used here, which is many times cheaper than all these fancy membranes. On television and in the network, there are many different programs, where work is underway on the renovation of houses and new construction. And only foreign channels show how in houses, especially frame ones, thus close the insulation. Roofs under cover, basements - everything is done on the same principle.



When I am asked what is the cheapest type of heating, I answer: the cheapest heating is a well-insulated house! - A specialist with a capital letter.

What does that look like? Insulation, tape tape, and finish. All! Then people in such houses do not freeze, nothing spoils, does not get wet. Yes, by the way, insulation-polyethylene is also vapor permeability. The film does not miss or release anything.

But we often tell about the alleged wet heater, which without a membrane will certainly gain moisture. Another negative point is the condensate flowing down the film. Then indeed the appearance of mold and fungus in places of accumulation of liquid is inevitable.



The second big drawback, according to some “professionals”, is that the film is a fragile material that breaks and becomes brittle over time. With this point of view, let me disagree: ultraviolet is the enemy of film. To check out, let’s do an experiment: look in a closet where you haven’t been in years (even decades), get plastic bags. They'll be like new! So why does the film under the finish have to change its properties?

If you understand, then the film is the most correct solution. With its help, we cut off the possible saturation of steam insulation from the room. Only important in insulated in this way rooms properly organize ventilation, otherwise steam can penetrate into the insulation.

Here is a sample table, which indicates how much moisture is released in the room.



All this excess moisture must be removed, and then with the insulation, closed film, there will be no problems. And here without ventilation in no way, it will be stuffy and humidity increased.

If air from the room begins to enter the insulation, then at a difference with the external temperature, condensation will begin to form. And it will be there constantly when the temperature difference is 4-5 degrees or more. The greater the difference, the more moisture in the insulation. Remember that if the insulation is wet, then it loses its properties as a heater. In simple words, the wall or ceiling is then not insulated, respectively, heating costs increase significantly.

It is simple: we have some made a wrong decision, then make anti-advertising and then promote expensive. Everything is much easier and cheaper in this regard.



Previously, insulation insulation in shield houses was used perganite. It's basically wax paper. And everything was fine. Later, we were brainwashed by membrane advertising. In fact, there is no need for special, and especially breathing, membranes. It's just that. marketing. The panel should be sealed on all sides. A dense film from the inside is needed so that warm air from the room does not enter the insulation. Be sure to paste all the seams on the ceiling and walls, and even on the floor.

It's a film. waterproofingNot breathing at all. Instead of ventilation of the membrane (it is even difficult to imagine how to make a deliberately muffled object breathe), you just need to comply with the installation conditions: vapor insulation, membrane, waterproofing.

We also put a membrane inside the house, but completely forget to put the forced ventilation system of the frame house. And all because of its terrible cost. In the West, a house without such a system simply will not be put into operation.



One designer-builder, who is now 85 years old, has derived a simple formula for vapor insulation: a dense film of 0.2 microns should be on the inside of the floor, walls, ceiling. And on the outer sides of the floor, walls and ceiling should be a breathing film.

Now, the quality of the products. Those who know how to choose the criteria of price – quality, lucky. However, there are in the stores of film of the wrong layouts. You need 200, buy 400. The density of polyethylene is known, the length and width of the roll is also, we weigh and calculate the thickness from the weight. Then it becomes clear that with the article "200" thickness will be 100-130, and sometimes all 80. So you need to take 400, and this is more expensive than membranes.

So it's perfect outside. membraneIt lets in moisture. According to European standards, it is clearly prescribed that there should be 100% vapor insulation from the warm room. For this, the film is best suited.
This is what a friend did, according to our climate. It isolated its PE walls 200 microns. There is no condensation behind the film. All the joints were made with overlap and glued with reinforced tape.



I thought about the ventilation. After all, moisture, if above 60%, already begins to condense on cold surfaces below 12 degrees. Like windows. It is best to keep it within 40%. But here it is important to make both inflow and outflow. Normal automatic ventilation, which will work depending on the temperature and humidity of the room, planned to do next summer. At the moment, the inflow is organized by microventilation of windows.

From the editor, a graduate of a construction university would sum it up as follows: “Resistance to steam passing multi-layer enclosure structures should grow from the outside of the building inside.” But it's brilliantly simple, don't you think? Tell me if you had any. film experience? Could you send me a picture? Let beginners learn how not to be divorced for money, but make insulation qualitatively.