Vapor - a party to a heater it correctly install and use other features of membranes

By Admin | Construction & Tips
13 April 2016

So finally insulated walls of the house.To do this, choose a traditional and inexpensive mineral wool.The work was entrusted to the builders who take cheap.Only, as it turned out, and they do anyhow.All still shivering gets, in addition, and the roof with walls dampen the start.After all these mountain-builders, most likely, and basic things do not know.And only need to properly lay a vapor barrier.How is the insulation and a heater to which side it should be laid discussed in this article.

Which side to a heater stack parolizolyatsiyu


  1. What are the construction of the membrane
  2. What you need to know about laying a vapor barrier - answers to frequently asked questions
  3. From the outside or the inside of the insulator mounted membrane
  4. As laidmembrane - face or underside
  5. In some cases, a layer of air near the membrane
  6. What should overlap when entering parts of the membrane for each other
  7. Why and the glued joints, and whether it
  8. Conclusion
  9. Video: waterproofing or vapor barrier

What are the construction of the membrane

to start a closer look at what happens, steam, and depending on its purpose.On the basis of its destination, the membranes used in construction works may be of the following types:

  • vapor-permeable membrane;
  • membrane having vapor barrier properties.

To protect the mineral wool against the penetration of moisture inside it laid a layer vapor barrier material.When the insulated roof or a room located under the roof, this film is sure to put.Vapor barrier layer must be below under the layer of mineral wool.If you have to insulate the walls from the inside of the building, as necessary to provide a barrier to water vapor.Thus it is impossible to use a material having pores or perforations.For more information about the inside wall insulation material, see: How to insulate the walls inside the apartment or house and how to do it correctly.

vapor permeability coefficient at this layer must be as small as possible.It is preferable to use, for example, polyethylene film (may be reinforced).Do not be amiss and foil aluminum coating on a film.Do not forget - by using a vapor barrier repeatedly to increase the humidity in the room warmed.Therefore it is necessary to consider a good ventilation system.

There are special film which is applied anti-condensation coating.Moisture does not accumulate on them.They are typically underlain by materials exposed to rust.This corrugated, galvanized, metal (not having a protective coating on the inside).The film does not reach the humid vapors metal.For this purpose at its underside has a rough fabric layer, which collects moisture.Stack film with anti-condensation coating need tissue side down and at a distance of 2 to 6 centimeters from the mineral wool layer.

The film with anti-condensation coating
film with anti-condensation coating.

Building membrane permeable evaporation, used in wall insulation on the outside, protecting them from the wind gusts.And they are used in pitched roofs and leaky facades as additional protection against moisture.From vapor-permeable films requires microscopic pores or perforations.The moisture that collects in the insulation should be free to pass through the ventilation system.The more active water vapor goes, the better.After all, if the insulation dries quickly, and the effects of its application above.

Vapour permeable films can be of the following types:

  • membranes psevdodiffuzionnogo type passed daily water vapor of less than 300 grams per square meter.
  • membranes have a diffusion coefficient of water vapor permeability of 300 to 1000 grams per square meter.
  • superdiffuzionnaya the membrane type the figure exceeds 1,000 grams per square meter.

Since psevdodiffuzionnye membranes are well protected against moisture, it is convenient to use them under the roof as an outer layer.Thus it is necessary to provide an air gap between the film and the insulation.But with the facade insulation such membranes are not suitable - too bad they passed pairs.After all, when it's dry, ventilation of membrane pores dust can enter.That's no longer "breathe" the film, and as a result of condensation settles on the heater.

How to put a vapor barrier or diffusion superdiffuzionnaya type?It is much easier, as the experience.This membrane has a sufficiently large pore openings and clog them is not so simple.Therefore, paving it, do not take care of the air space for ventilation on the bottom side.This makes it easier - no need to mess around with the installation of lathing and counter battens.

There diffusion film is not only common, but also three-dimensional.They are arranged such that the ventilation layer is disposed within the membrane.Due to this condensation does not reach the roof of the metal.The principle of operation of such a film - the same as that of the anti-condensate.The difference is that the bulk membrane removes moisture from the heat insulator.Indeed, if the metal roof is inclined at a small angle (3 to 15 degrees), the condensate formed on the underside, can not flow down.It is slowly but surely eroding the galvanized coating is gradually destroying it completely.

Volumetric membrane
bulk diffusive membrane.

What you should know about laying a vapor barrier - answers to frequently asked questions

With inside or outside insulator mounted membrane

# 1.If it is necessary to insulate facade, the film for discharging vapor placed outside.

Vapor-permeable membrane

# 2. But when the roof insulation used with anti-condensation coating film, diffuse or volume.They should be put on the mineral wool on top, just as it is done in a ventilated facade.

# 3. If the roof is built without insulation, the film layer must pass beneath the rafters.

# 4. insulated top floor room under the attic vapor barrier put a bottom insulator.

# 5. And the last option - internal wall insulation.Here the vapor barrier film (uncut) must be installed on top of the mineral wool, being located inside the room.

As the membrane stack - face or underside

# 1. As it turned out, many masters do not know which side to put a vapor barrier.The easiest way, if the film is a vapor barrier has the same right and wrong sides - the question immediately removed.But not always - produced film and one-sided.For example, antiokondensatnye - wrong side of fabric, and when installing it should look into the room.There also should be paid to the metal coating on the foil membrane.

# 2. to diffusion films manufacturer usually applies to the installation manual.It is described in detail which way the membrane is placed.Carefully read this description: it is the same firm can produce a film both unilateral and bilateral.Determine can sometimes be externally - color.If the membrane has two sides, one of them is colored more brightly.Typically, this outer side of the film.

In some cases, a layer of air near the membrane

# 1. At the bottom of all films for vapor barrier usually arrange ventilation space width of about 5 centimeters.This is done to get rid of condensation.We can not allow that lining the walls in contact with the membrane.If you use a film diffusion, it is mounted directly on the heater, water-resistant plywood or OSB.Here the air layer must be done from the outside of the membrane.In Anti-condensation membrane gap is supposed to be 4 or 6 centimeters on each side.

# 2. insulated roof, ventilation space do by constructing kontrobreshetki consisting of bars.A facade type ventilated gap is obtained by mounting racks or horizontal profiles, perpendicular to the film.

What should be the overlap of the membrane when entering each other

# 1. Along the edge of vapor barrier films have markings.It indicates what should be an overlap webs - typically 10 to 20 centimeters.This is important when a vapor barrier of the roof - the film is also supposed to protect from moisture.Overlap is calculated depending on the angle of the roof.Thus, an angle of 30 degrees to the required overlap of 10 centimeters, 15 centimeters is enough for the angles of 20 to 30 degrees.If the ramp angle less than 20 degrees, part of the film must go to each other by 20 centimeters, at least.

# 2. membrane diffusion must overlapped at the location where the skate, as 20 centimeters.In the valley overlap of 30 centimeters, and the band is more laid on the slope if the slope of the roof is low.Sunset strip on both the slope should be between 30 to 50 centimeters.On the roof membrane and the side of the closed thermal insulator.Conclusion it is either the discharge chute, or a drip.Why

and the glued joints are, and whether it

Portions of the membrane should be sealed prokleivat.This is done by means of self-adhesive tapes, such as unilateral or bilateral.They are made of normal or expanded polyethylene, butyl or butylene, polypropylene.These ribbons can produce a vapor barrier and repair embedded cracks and holes.

What kind of tape is better to use, it is recommended manufacturers.Just do not take it for this purpose tape, especially narrow.In this case, you can forget about the leak - plastered joints in a short time.

What hardware should be used for mounting

membranes and can take nails (provided that they have a wide hat), but you can use a conventional staple gun.But the best are considered to be counter-fixture.


to multilayer construction design served as a long time, the membrane should be used.Otherwise, the optimal ratio of temperature and humidity is not achieved.The main thing - to know how to choose the right and which side is to lay a vapor barrier.

If the price of building the membrane is less than 0.5 percent of the budget, the protection insulation is a reasonable measure.After all, at the same time and in the rooms to be comfortable, and the cost of energy will be reduced.

Video: Waterproofing Vapor or

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