The vapor barrier is fraught with wrong: illustrative examples of the big problems

How to paroizolirovat and mount the ceiling of the first floor and a wooden frame house, the boards do not rot, do not get wet insulation, and the film did not have to throw

With steam hydro and wind-proof films are constantly happening confusion. Developers and builders mold them as they like, according to the principle "if only it were." As a result, insulated with rock wool slab or wooden frame house, picks up moisture. Insulation dampen. Boards covered with mold, and, ultimately, this leads to costly repairs. How to avoid it? Read our article, which contains practical experience and schemes right vapor barrier and insulation ceiling of the first floor of the tree house.

Content:

• Videos about the consequences of improper vapor barrier
• Why the moisture formed in the ceiling of the first floor
• The vapor barrier is different from hydro and windproof film
• Proven "pies" vapor barrier and thermal insulation of the ground floor
• "Cheat Sheet" Installation of steam insulation: print it and enjoy it

The consequences of improper vapor barrier

It is better to see once than hear a hundred times, or read up on the doorposts of "professional builders" that they allow the installation of insulation and vapor barrier in wooden houses. What this results in is shown in the video, which took Igor Bekker (nick portal Igor3).

It - condensate, rather than the effects of water leakage in the home.

Igor3

User Forumhouse, led by a team of builders, who are engaged in repair and replacement of foundations, as well as the shifting of houses

I often encounter incorrect application of steam and water proofing. This leads to the defeat of mold designs.

Check out the video below, which shows what happens to a wooden beam, if it is wrapped in a roofing material.

A similar result is obtained if properly insulate wooden house. For example, 'pinch' wooden joists on both sides in the vapor barrier - a vapor-proof film.

Here's what can turn a wooden "rough" sex for 1 year, in violation of construction and improper vapor barrier.

Now explain why it happened.

Why in the wooden floor is formed overlapping the first moisture

Above we showed "horror stories". It's time to learn, which is why there was moisture in the wooden ceiling beams and began to rot.

Igor3

In the house of the video, a large number of construction errors. The building itself is also unusual. First, the owner built a toilet. Then I put the next garage-shell. Then I stuck two more container. He added a room, and erected on top of the attic and covered all common roof. As the foundation - concrete footings. They sagged. House contorted. The owner has decided to renovate it. When lifting and shifting of the house, we saw that in the ceiling of the first floor of accumulated water that has condensed from the steam coming from the inside to the outside of the house. And that's not all.

List the basic error:

• The main "herd" builders - the bottom floor stretched vapor-proof film.
• The height above the floor and cold moist soil 5 cm.
• Because of the vapor barrier film all condensate stok and accumulated under the floor. Also, condensation dripped from the walls of metal embedded in the container house.
• A heater mounted above the vapor barrier. Formed "pockets" where the accumulated water which is poured after the cut film.

Now explain the physics condensation process in appearance due to improper overlap of the vapor barrier. The air was warm room contains water vapor. The steam from the pressure differential tends to get out of the warm zone to the cold, ie. E. goes out of the room to the street. In our example - under the floor, which in May was still ice. Moisture saturation air is passed through the vapor-permeable membrane, which is mounted above the insulation builders. I got into the insulation. I could not go outside, ie. To. "Rested" in the vapor barrier. The water vapor is condensed on the film and the water formed.

Remember! Steam insulation film in a heated house is made only from the inside, not outside. The thickness of the insulation is determined by thermo-calculation, and is not taken by eye.

Igor3

This overlapping of the film are mixed up. From the side of the room, under the flooring, he had to standvapor barrierfilm. It protects the floor from getting a couple inside the house. By overlapping the part of the street must bevapor-permeable membrane. It does not prevent water vapor to exit the structure.

The difference between the vapor barrier from hydro and windproof film

Why builders often confused film locations? After all, it seems enough to read the manufacturer's recommendations for installation of steam and wind protection and waterproofing. Not so simple. The construction market offers dozens of options. Simplify your task and use the "cheat sheet" from Igor Bekkereva, which is based on personal experience of the user portal.

Igor3

Films, of course arbitrarily, be divided into "breathable" paroprozrachnye diffusion membrane, and a vapor barrier which practically does not pass and water vapor. Membranes release water vapor from the heater and design, but do not pass the water droplets which condensed on the outer side of the film back.

Superdiffusion membranes are well passed steam in both directions.

Important! Before buying a waterproof film, for example, underlay, examine its technical specifications and capacity for water vapor - high or limited.

The film, which does not "breathe", has good waterproofing properties and is cheaper than superdiffuzionnaya membrane, but when it installation on the roof will have to do a double ventilation gap, t. To. It does not display steam and it can not be mounted close to the insulation.

diffusion membrane can be installed close to a heater, t. To. They output pair, but do not pass moisture to the outside structure. Such a film is easier to install on roofs of complex configuration.

To sum up, then:

• Wind protection - does not pass wind and dust, but allows couples.
• Vapor - does not pass and water vapor.
• Waterproofing - is water. But it is different: a transmission pairs or paroneprozrachnoy.

How it works is simplified, it is shown in the figure below.

Proven "patties" of wood insulated ceiling of the first floor

We understood the appointment of different films and briefly describe their work. Now it will be clear how to mount the ceiling of the first floor in the frame and a wooden house.

Igor3

In the photo below right cake above the lower floors of the ground floor in the living room. For the bath, add ventilation gap under the floorboard.

Schemes with different form factor and ventilated floors.

A similar scheme is going to "pie" for the walls and roof.

 More diagrams showing how to mount the steam and waterproofing:

• With the finishing floor made of board.

• With the finishing of the floor tiles, laid on cement and expanded clay screed on wood joists.

• C warm water on wooden floor joists.

conclusions

In this article we talked about the choice of the principles and operation of steam insulation and diffusion membranes. To avoid confusion, note or print a "cheat sheet", which brings together the 3 main principles of proper installation of steam and waterproofing:

• Vapor barrier film is placed inside the warm circuit.
• Do not roll up wooden joists and mineral wool insulation on both sides in a water vapor impermeable film.
• Outside place vapor-permeable film (membrane) which outputs steam but does not allow atmospheric moisture condensate and get into the construction and insulation.

film overlaps required to cement the special adhesive tape, ribbons, glue, or butyl rubber sealant materials that are recommended manufacturers.

Still have questions? Ask them to our experts in the topic The consequences of improper vapor barrier.

We recommend the article:

• Flat roof: whether or not, and if necessary, how do the right thing, so as not to regret.
• How to quickly repair the roof in the attic on a building.
• Installation of mansard windows: The most complete guide in RuNet - from a vapor barrier installation, vlagovetrozaschitnoy film and troughs for condensate to the calculation of the attic window.

In the video - installation of a vapor barrier in a wooden house and sealing joints with walls and truss systems using different materials.

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