Foil polyethylene film. Foil vapor barrier: scope and laying technology Aluminum-coated film

Foil film - vapor barrier with a heat-reflecting effect. One of the types of vapor barrier, characterized by an additional reflex function (heat reflection). This is achieved thanks to the metallized layer, which must face the heat source.

Why foil film is needed

Foil film is used as a vapor barrier in rooms with high temperatures - in baths and saunas. Such a film does not melt and does not emit hazardous substances even at a temperature of 120°C. Also, the reflective properties of the film are very important when constructing modern steam rooms, because it is required to warm up the sauna for a short time and with a minimum of energy consumption.

But foil vapor barrier is justified not only in the sauna. If during construction frame house replace the usual vapor barrier with a foil one, with the same heating power, you can get an increase in the temperature in the rooms by 2 ° C.

But reflective vapor barrier must be used wisely. So, it is not recommended for internal insulation of buildings made of heat-intensive materials (brick and concrete). Frozen walls will only worsen the microclimate. But in wooden house from logs or timber internal insulation foil wrap will come in very handy.

Reflective vapor barrier is also suitable for an unheated loggia - a film laid under the floor covering will make it warmer. When glazing open balconies when the entire perimeter is sheathed with sandwich panels that do not conduct heat, the foil film will reduce heating costs.

Properties and types of foil films

The foil film not only protects the insulation from moisture penetrating from the premises. When using a foil vapor barrier in a sauna, you can protect the inner lining from mold and decay, which inevitably appear due to constant condensate after the steam room is turned off. Due to the reflection of heat, the condensate simply does not settle.

The characteristics of the foil film depend on the materials from which it is made:

based on kraft paper - such films are inexpensive and easy to handle, but hygroscopic and easily torn;
on the polymer base- differ in durability and durability, but more expensive;
with aluminum sputtering - the thickness of the aluminum layer of these films starts from 0.3 microns, but the smaller the sputtering, the worse the heat-reflecting properties;
with aluminum foil - films with a foil thickness of 10 microns provide maximum level reflect heat (up to 97%), but are susceptible to corrosion.

So, it is most rational to insulate a bath using aluminum-coated polymer-based films - they are not subject to corrosion, withstand high temperatures and are quite durable, which simplifies installation.

Films based on kraft paper can only be used in dry rooms - they are not suitable for the kitchen or bathroom. And for a warm floor, films with aluminum foil are better suited, which evenly distributes heat, smoothing out possible cold bridges with insufficiently dense pipe laying.

Films Ondutis R Termo

They are used to protect insulation, wooden and metal structures.

When warming attic floor or when roofing a residential attic, the R Termo foil film allows you to save heat, reducing heating costs.

The vapor barrier has a water resistance of 1000 mm of water column and a minimum vapor permeability - less than 10 g / m 2 per day. At the same time, it calmly tolerates temperature drops from -40 to + 120 ° С. Strength is indicated by a breaking load of 150 N along and 130 N across - Ondutis R Termo film can withstand an adult and rather well-fed person.

Installation of foil films

The installation process of foil vapor barrier is practically the same as the usual one:

The film is rolled out horizontally and begins to be fastened from the bottom up with an overlap (10 cm). It is important not to confuse internal and outside- foil vapor barrier is mounted only with the shiny side inside the room.
TO wooden structures it is nailed with a mounting stapler, and to concrete or brick walls- special mounting tape.
If a vapor barrier is made for the entire room, first it is laid on the floor with a 10 cm approach to the walls, then the walls are sewn up and the last is the roof insulation.
To ensure a vapor barrier, all joints are first fixed with mounting tape, and then glued with metallized tape. Mounting tape also glues all the passage elements - chimneys, pipes, electrical cable outlets.
A bar with a thickness of 3 cm or more is nailed over the film - it provides a ventilation gap, which is mandatory for foil films.

Manufacturers endow special properties materials that are used for the construction of roofs and the arrangement of premises where non-standard temperature and humidity operating conditions prevail. As a result, the materials are able to withstand the attacks of hot air and create a kind of “thermos” effect, due to which energy for heating is spent more moderately. These products include foil vapor barrier.

Principle of operation

foil materials is a complex product with a layered structure. The basis here is a polypropylene fabric, fiberglass, lavsan. These are components that are resistant to bursting effects, to biological and chemical aggression.

The use of a strong non-woven or woven polymer base allows you to create a reliable base for metal foil, which in itself cannot boast of special strength. At the same time, flexibility for installation is maintained. This composition eliminates the possibility of settling fungal colonies and decay.

Vapor barrier materials on the working side are duplicated with a metallized film. are saved positive traits and aluminum foil, and a polymer base. Vapor barrier with foil copes with three tasks at once:

Application methods

The structure of foil vapor barrier materials has significantly expanded the scope of application. Now they are actively used in insulated roofs., often placed on the inside of the roof pie, and in the south they are usually mounted above the insulation. If the house has an unfinished attic, then foil protection is installed along with waterproofing.

Often used as a substrate for floor coverings and underfloor heating systems, for insulation of structures frame walls. A foil vapor barrier is also installed in the form of a screen that reflects heat flows from any heating units.

The system must be installed correctly so that the foil materials can fulfill their reflex function. Between the steam room ceiling, walls, inner lining attic and metal cladding should always be left unventilated air gap, the thickness of which should not be less than 2 cm.

If the material is used as a heat-reflecting roof screen or flat roof, then between the roof and the metallized coating a ventilated gap of 3 cm is left. Here, everything that is reflected from the foil can be safely taken out into the street along with the infiltrated steam and condensate.

The necessary gaps are formed by installing a crate from a metal profile or a bar. Lattices are placed taking into account the type roofing, calculated by the load on the structure, the slope of the slopes is also taken into account.

Benefits of using

Insulating materials, where a water-repellent material is combined with foil, have a lot of advantages, due to this they are in high demand among craftsmen. These include:

Installation technology

Most often, vapor barrier materials with foil are used to equip a cold attic and a warm attic. In the first case, the insulation system must be installed along the ceiling, in the second - along the slopes.

To install the vapor barrier correctly, you must adhere to the generally accepted rules for construction:

It is worth noting that accessories for foil insulation must be selected from the same manufacturer as the material. Of course, you can find universal adhesive tape on sale, suitable for connecting materials of any kind, but in the case of foil structures, you need to remember about tightness. Therefore, it is better not to experiment with adhesive tape options for gluing, but to take it from the same company as the foil sheets themselves.

Leading Foil Products

For arranging a ceiling or attic you need to select a suitable and reliable vapor barrier film. Therefore, you should first find out what proven and popular product options are on sale in the construction markets.

Energy saving film DELTA®-REFLEX

This product has proven itself in the construction of roofs, among roofers it has impeccable reputation. The reflective coating on the working side is created by spraying. Then a polyester film is applied over it, which protects the aluminum layer from shedding and damage. The reflection coefficient of this product is about 50%.

At sub-zero temperatures the film does not lose its flexibility, it is used in arranging protection against steam from inside the house and outside. Can be applied in different rooms with high humidity. If you find a variant of a similar film, but where the word PLUS is added in the marking, then a self-adhesive tape will be located along the edge of such canvases - it greatly facilitates the work of installers, which is why it is bought most often, despite the high cost of products.

Reflective material "Izospan FD"

In terms of price, this is a more humane option, but it is also less resistant to the realities of adversity. This is a two-layer composition of polypropylene fabric, an aluminum coating is applied on top.

In terms of strength indicators, it is inferior to the first option, but it is able to get ahead in terms of energy-saving characteristics: thermal reflection coefficient is about 90%. Usually attracts installers with its affordable price, in addition, these products are easy to find in many hardware stores. It is worth noting that in the technical passport of the film, a separate line indicates the temperature range, which ranges from -60 to +80 degrees.

"ARMOFOL® type A" super strong

Such a vapor barrier is made on the basis of a durable fiberglass mesh. The scope of application is exactly the same as the two previous options. But the temperature operating range is more extended. The material serves flawlessly at a temperature of -60 degrees (at Delta, the threshold is -40). And in the positive segment, the limit reaches +150 degrees.

Armofol is used both in new construction and for restoration work during the repair of basement and basement structures, roofs, swimming pools, saunas, bathrooms, Russian steam baths. In terms of thermal reflection, the coefficient reaches 97%, due to this indicator, the material is also purchased very often.

Both professional roofers and independent craftsmen. Properly laid material is a guarantee that your favorite property will be equipped for a long service life. Therefore, to such repair work you need to approach with all responsibility: starting from the choice of popular options for foil films and ending with their installation.

Updated: 03.05.2019

In a wide range of floor insulation special place occupies foil material. Due to the reflective surface, the efficiency of the heat-insulating layer increases many times, providing comfortable conditions in a dwelling. Lightweight, durable, with good soundproofing properties, foil floor insulation is becoming increasingly popular in private housing construction, especially since its installation is not particularly difficult.

This insulation consists of two layers - a base and a reflective coating. As a basis, classic heat insulators are used - foamed polyethylene, expanded polystyrene, mineral wool and other materials. The reflective coating is a polypropylene metallized film or a thin layer of aluminum foil. The thickness of the insulation directly depends on the type of base.

Varieties of heaters

Foamed polyethylene insulation has a thickness of 2 to 10 mm and is available in rolls. It is usually used during the installation of a "warm floor", with further pouring of the screed, and as an insulating substrate for some types of floor coverings. Especially popular is self-adhesive material, the laying of which takes a minimum of time. The insulation has many varieties, of which the most popular are Isolon, Ecofol, Folgoizol, Penofol and Isoflex.

fiberglass insulation and mineral wool has a thickness of 50 to 100 mm, is commercially available in the form of rolls and plates. It is used for insulation of interfloor ceilings, thermal insulation of baths and saunas. Foil-coated basalt insulation has increased heat resistance, but has one drawback: it contains phenol, which is unsafe for human health. The most popular brands of insulation: Knauf, Rockwool, Parok, Izover.

A heat insulator based on expanded polystyrene is produced in the form of rigid plates covered with foil. It is used when laying a warm water floor, as well as for thermal insulation of surfaces subject to dampness and heavy loads. For the convenience of laying heating pipes, special red markings are applied to the foil coating.

Properties of heaters

Foil heat insulators have the following properties:

high reflectivity;
resistance to temperature changes;
moisture resistance;
excellent steam, hydro, sound and heat insulation performance;
durability;
light weight;
ease of installation.

Floors with such a heater will never become damp and will not require processing. protective equipment will last much longer. Most foil heat insulators do not contain carcinogenic components, so they can be used in any room, in addition, they reflect radiation, which is now important.

The type of coverage matters a lot. Aluminum foil perfectly reflects heat, but is destroyed by alkalis in concrete, and metallized film is not susceptible to such exposure. That is why insulation with an aluminum layer is not used for concrete or cement screed. The thickness of the reflective layer is no less important: some manufacturers simply spray over the heat-insulating base, which significantly reduces the effectiveness of the insulation. The thinner the layer, the easier it is for heat radiation to pass through it.

Wooden floor insulation

For work you will need:

insulation;
scissors;
metallized tape;
roulette;
grinder;
antiseptic primer;
putty.

For wood, self-adhesive insulation is best, but if you purchased a regular one, you can attach it to the surface with construction stapler or double sided tape.

Step 1. Carefully prepare the base: remove the skirting boards, remove debris and dust, treat the surface grinder or loop. If there are gaps, you need to close them with putty.

Step 2. For greater preservation of wood, the floor is primed with an antiseptic compound.

Step 3. After the primer dries, the insulation roll is brought into the room and measured right amount material. Cutting is performed with ordinary scissors. Lay out the heat insulator on the floor with the reflective layer up, remove protective film and press the material to the surface.

Step 4. The next canvas is laid end-to-end to the first, trying not to leave gaps along the seam. In the same way, the remaining strips of insulation are laid, if necessary, making cutouts for communications or niches.

Step 5. All seams between the strips are sealed with foil tape.

Step 6. Perform styling finish coat- laminate, parquet, linoleum.

concrete floor insulation

To attach the insulation to the concrete base, a special rubber-based adhesive is used. In all other respects, the technology is similar to the insulation of a wooden surface.

Step 1. concrete base carefully level, close up defects, clean the surface of dust.

Step 2 Roll out a roll on the floor, starting from the wall. Take measurements and cut off the excess with scissors. Next, the insulation strip is shifted to the side and glue is applied to the base. After 1-3 minutes, a foil insulation is laid on the floor and pressed. The reflective layer should be at the top. The use of glue is optional and many builders do not use it. Just like that, the insulation will not slide on the base and move during the laying of the finishing layer.

Step 3. The second and subsequent strips are laid end-to-end, the seams are fixed with adhesive tape. Now you can start laying finish coating. Linoleum cannot be used as a coating, because the insulating substrate is soft, and linoleum will be squeezed under the weight of the furniture.

If the floors are very cold, after laying the foil material, logs are mounted from a bar, set them horizontally, the space between the logs is filled with ordinary insulation, and plank floors or sheet material are mounted on top.

Step 1. Floor slabs are thoroughly cleaned and irregularities are eliminated with putty or cement mortar.

Step 2. Roll reflective thermal insulation is laid, tightly joining the material. Glue all joints with metallized tape.

Step 3. A heating cable or heating pipes are laid out over the insulation according to the project.

Step 4: Over heating elements lay down thin film made of polyethylene, which will protect the foil coating from the aggressive effects of the cement screed.

Step 5 Knead the solution and pour the leveling screed. When the surface is dry, you can lay the final floor.

Laying slab material

Reflective thermal insulation in slabs is mounted mainly under underfloor heating, although it can also be used as ordinary insulation. With foil mats, a floating screed is made and laid between the lags.

floating screed

Step 1. concrete surface floor slabs are leveled with the help of grinding. Cleaned from dust.

Kermi damper tapes

Step 4. Plates are taken with a metallized coating, since aluminum is corroded by cement. Glue is applied pointwise to the base of the mats, after which the insulation is laid on the floor with the reflective layer up. When laying the insulation, the joints are carefully adjusted so that gaps do not form.

Step 5. The joints are glued with adhesive tape, and then the heat-insulating layer is poured with a screed solution. Level the mixture with a wide spatula or rule and leave to dry. After that, you can perform the laying of the final coating.

Video - Laying foil mats

Warming along the lags

Step 1 Remove the floor covering, clean the base from debris, check the integrity of the lag, and, if necessary, repair the damaged elements.

Step 2. A waterproofing material is laid on top of the logs and fixed with a stapler on the inside of the bars, spreading the film well on the floor. The edges of the canvases overlap by 10-15 cm.

Step 3. The space between the lags is filled with foil plates, laying them in one or two layers. The plates of the second layer must necessarily overlap the seams of the lower layer. A gap of 1.5-2 cm is left between the reflective coating and the upper edge of the log. If the gap cannot be left, a crate of 20x40 mm rails is stuffed on top of the logs.

Step 4. Further actions depend on the type floor covering. If it is linoleum or laminate, close the rough base sheet material- plywood, chipboard, OSB. If the floor is made of boards, they are stuffed directly onto the logs.

Table of the main properties of foil heat insulators

Name	Properties	Thermal conductivity	Where applicable
	Elastic material, light weight, waterproof and durable	0.040 W/mK	As a substrate for laminate and linoleum, mounted under warm floors
Penofol	Flexible, thin material, eco-friendly, waterproof	0.037-0.049 W/mK	Can be used as a vapor barrier for conventional thermal insulation materials
Isover	Non-flammable, dense heat-insulating material	0.041 W/mK	For insulation of concrete and wooden surfaces
Rockwool	durable non-combustible material, resistant to deformation	0.39 W/mK	Insulation of floors on logs, heat and sound insulation of walls and ceilings
Foil Styrofoam	Temperature resistant, durable	0.037-0.041 W/mK	For insulation of a warm water floor, insulation of a floating screed

Video - Foil floor insulation

Vapor barrier is widely used in wooden housing construction. Any vapor barrier films are attached to wooden structures in front of the insulation layer. For fixation, staples and a special stapler are most often used. Laying is carried out by butt or overlap methods, and adhesive tapes are used for gluing seam joints. Today there are several types of such films.

Types of vapor barrier films

The main requirement for vapor barrier films is the ability to transmit steam to a minimum, and also to keep maximum strength with no deformation changes.

Heat reflective or foil film

Such a category vapor barrier films not only protects against the accumulation of steam, but is also an excellent barrier that protects against thermal radiation. Standard heat-reflecting films are characterized by a combination of several functions at once and allow you to protect the structure from steam, having the highest quality thermal insulation properties and guaranteed to reflect heat into the equipped room.

The use of material from the category "three in one" contributes to a significant simplification of all ongoing installation work and reduces the cost of consumables.

Polyethylene vapor barrier

Standard types of polyethylene films used for vapor barrier. Produced with special reinforcement reinforcing meshes or fabrics that give guaranteed strength.

The perforated film has rare micro-holes and has a stable a high degree vapor permeability. Despite this difference, when performing waterproofing under-roofing works using polyethylene films, it is imperative to perform a ventilation gap above the insulation layer.

Polypropylene films

They have certain advantages over polyethylene counterparts, the main of which are higher strength and resistance to ultraviolet radiation. Polypropylene is able to protect structures from atmospheric precipitation for about twelve months in anticipation of the installation of roofing materials.

To minimize the formation of condensate, one of the sides of the reinforced polypropylene film is equipped with a special anti-condensation layer, represented by viscose fiber and cellulose. The main purpose of such a special layer is the ability to perform moisture-absorbing and retaining functions, followed by very fast drying under the influence of air flow.

Anti-condensate polypropylene films are placed with the main layer down, however, the creation of a ventilation gap remains relevant. moderate cost and good performance strength make this type of film very popular.

Manufacturers and technical characteristics of the material

Modern vapor barrier films construction market Russia is represented by several manufacturers at once, which produce sufficiently high-quality products.

Vapor barrier for a flat roof Techno NIKOL (3x30 m). - multilayer polyethylene film

TechnoNikol Company

Vapor barrier films provide moisture resistance for many years and are divided into diffusion and non-perforated.

Diffusion "breathing" membranes are the best option under-roofing insulating materials, consisting of a continuous polymer film with two layers of polypropylene fabric.

Non-perforated film type designed to protect any space not only from moisture, but also from dust. In the production process, reinforcement is used by means of a special mesh or fabric, which gives additional strength. Most often used for vapor barrier work during roof installation.

Roll materials are easy to install and connect.

Vapor barrier "Izospan-V"

Manufacturer Izospan

In addition to a wide range, the manufacturer guarantees a reliable thermal insulation barrier and protection from wetting and weathering. Main options:

vapor-permeable membranes are strong, dense and resistant to ultraviolet;

propylene two-layer membranes;

propylene film laminated.

Izospan-V film - vapor barrier pitched roofs or attic floors;

Izospan-D film - laminated propylene for non-insulated types of roofs;

Izospan-DM film - propylene with anti-condensation coating on one side, resistant to any mechanical stress.

Manufacturer Yutafol

Yutafol vapor barrier films are used as heat-insulating and hydro-protection.

The brands N, SP1, NAL Special and D are produced.

The main application is the installation of a vapor barrier in conditions of ventilated roofs of an inclined type, as well as in the arrangement of a roof with soft tiles. When performing seam sealing of this roll material applied special kind construction tape.

How to choose the best

The choice of vapor barrier is based on an assessment of the functional properties of the material. The diffusion type of membranes belongs to the universal modern materials for use in all types of conditions roof structure and in conjunction with all methods of insulation. Such a vapor barrier is several times more expensive than other types of waterproofing films.

The device for waterproofing on non-insulated roofs allows the use of an ordinary universal or perforated film from proven and well-established manufacturers.

An insulated roof with a natural ventilation gap allows the use of an inexpensive category of perforated or universal waterproofing.

When arranging pitched metal roofs It is advisable to use anti-condensation films.

Material cost

The most significant criterion for choosing a vapor barrier film is the price.

The cost of TechnoNIKOL films starts from 3000 rubles per roll. Vapor barrier films from TechnoNikol for furnishing pitched roofs cost about 1150 rubles per roll, and the price of reinforced materials averages 1875 rubles per roll. Vapor barrier materials flat roofs- from 1697 rubles per roll.

Izospan vapor barrier has a competitive price. The cost depends entirely on the brand of vapor barrier material. The price of Izospan-V is several times lower than the cost of heat-reflecting Izospan-FX. The high cost of thermal insulation from this manufacturer is due to stable durability and excellent performance.

The best option is to use vapor barrier films from Yutafol, the cost of which starts from 1,500 rubles per roll.

Summing up

any waterproofing film is mounted above the thermal insulation layer;

rolling the roll with the material is carried out perpendicular to the truss system in the direction from the bottom up;

the standard overlap is from fifteen to twenty centimeters;

to seal the joints, a special adhesive tape or connecting tape is used.

To create a fully functional vapor barrier in rooms with unstable indicators of temperature and humidity, it is necessary to use appropriate materials, sharpened for specific specifics. Similar conditions are formed in buildings such as baths, attics, unheated dachas and outbuildings. Given the features, a good solution would be to install such a canvas as a foil vapor barrier. But in order to end up with a fully functional protective layer many factors must be taken into account.

Why foil vapor barrier is needed

As mentioned above, a vapor barrier layer with a metallic aluminum coating is used in special cases and only in certain types of buildings, why is this needed?

Firstly, the most important function of a foil vapor barrier is the ability to keep structures from getting excess moisture into them. But, unlike other films and membranes, analogues with the existing metallized coating still perform the work of a heat reflector. That is, foil layers of vapor barrier are primarily needed where it is worth increasing energy saving.

2 Secondly, in rooms such as baths and saunas, the use of conventional films and membranes is impractical, since high temperatures will quickly render the protective layer unusable. And in the conditions high humidity a protective layer is simply necessary.

On a note

It is worth knowing that the usual "working" range of most vapor barriers is from -40 to a maximum of +80 degrees. This makes their operation impossible at temperatures exceeding +100. Foil vapor barrier for a bath easily tolerates such loads.

3 Thirdly, the use of foil vapor barriers will be in demand for wooden frame construction and the construction of houses from a log / bar. This will increase the energy efficiency of the building with excellent protection of load-bearing structures from vaporous moisture.

On a note

When laying a foil layer in the walls of buildings, the temperature in the premises will increase by 2-3 degrees!

Also, a good solution would be to use a vapor barrier with a layer of foil in the premises of cottages, outbuildings, balconies and attics, which are poorly or not heated at all. This will both protect the structures from condensate and reduce the overall heat loss of the room.

However, it is important to know that the use of foil panels is strictly limited by the material of the walls of buildings. In houses built with brick or concrete, it is not recommended to use foil vapor barrier, this will increase their degree of freezing, which in general will worsen the microclimate inside.

Types of foil insulation and regulations for their use

In addition to wall materials, the use of vapor barrier is regulated by its type, or more precisely, by the material from which it is made.

The panel has two layers - the base and the actual metallized coating. The base of the vapor barrier can be of two types:

From kraft paper. Pretty simple and cheap material, however, it is subject to mechanical stress, and less resistant to moisture.
From polymer materials. Such a base is resistant to damage, humidity, temperatures.

The metal coating of insulating panels also comes in two types:

Aluminum spraying. The layer thickness can be 0.3 microns or more. However, thin metallized films play the role of a heat reflector much worse.
Aluminium foil. Such vapor barrier materials have a metal layer of 10 microns, which makes them resistant to corrosion, and the degree of reflection is about 97%.

Choosing foil insulation is based on two factors: the type of room, and the types of the film itself. Sheets coated with polymer-based metal foil are best suited for wet conditions baths. And for dry rooms you can buy more cheap option spraying on paper. Also, the first option covered with foil goes well with a warm floor.

Advantages of foil vapor barriers

The metallized layer on the vapor barrier base significantly improves the properties of the barrier, and gives it tangible advantages over conventional films.

Small mass. With decent functional properties, the foil vapor barrier has a low weight, which does not create a large load on bearing structures the buildings.
Slight thickness. The layer laid on the attic ceiling or ceiling does not affect the volumes, as well as the height of the room due to minimum thickness base and the metallized coating itself.
The convenience of use. Vapor barrier with foil are easily mounted on the curved contours of buildings, and in hard-to-reach places. In addition, it is very easy to make a blank of any shape by simply cutting the panel with scissors. Also, you do not need to have specialized tools and skills to mount the insulating layer.
Temperature stability. The presence of a foil layer makes the vapor barrier less susceptible to high temperatures. And in the complex, the film gives maximum protection to structures from high humidity.
Purity of materials. The production of such insulation does not require toxic materials and compounds that can be released under the influence of heat.
Versatility. Using the same type of cloth, you can isolate various elements buildings adjacent to the installation site.

The manufactured assortments of reflective vapor barrier can be selected for any room, starting from the price-quality factor. It will equally have vapor barrier protective properties. And long-term operation in conditions of even excessive humidity (typical for a bath) will not lead to the formation of mold and fungus.

But, you can get a fully functioning vapor barrier in the room only taking into account its specifics, and most importantly, compliance with the installation rules.

Features of the installation of foil vapor barrier

The main task that lies on the vapor barrier is to protect the insulation and walls from the penetration of moisture inside. From this function they are repelled when mounting panels in different rooms.

When assembling "cold" roofing cake metallized strips of material are mounted in the ceiling (recommended for the ceiling), from the inside of the room with the foil down.

If installation is carried out for a house in the attic, then the foil vapor barrier is laid with the metal side inside the room on top of the laid insulation on inside roof slopes. The film is fixed with a stapler and slats of the counter-lattice.
In the bath, foil vapor barrier is mounted on all planes, on the floor, walls and ceiling. The foil surface is turned inside the room.

If you confuse the back and front sides of the foil vapor barrier, then all the moisture will be inside the walls and insulation.

When mounting layers, you should follow the technological rules of laying:

Everything wooden details truss systems and other structural elements, should be carefully inspected for protruding sharp edges, or fasteners in order to avoid damage to the film during installation.
Before proceeding with the installation of insulation, it is worth treating all the wooden parts of the building with an antiseptic. This will extend the life of the material and is guaranteed to eliminate such a problem as the formation of fungus and mold.
Vapor barrier layers on any planes (roof slopes, walls, interfloor ceilings) must be continuous. The porous structure does not require the presence ventilation gaps. The mounted panels are connected hermetically using foil tape for this.
Laying the vapor barrier is carried out only in a horizontal position, according to the scheme from top to bottom. That is, the first strip is mounted near the ridge, the second lies below the overlap on the first.
Laying panels of material, make releases on the walls and other nearby areas. The width of such strips should be at least 150-200 mm.
Fasteners in attics, attics and ceilings are carried out with a stapler. Additional fixation is performed with laths of the crate, which can later be used as a base for the inner lining.
All joints of the panels are glued with foil tape.