Foil-clad polyethylene film. Foil vapor barrier: scope and installation technology Aluminum-sprayed film

Foil film is a 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 do you need foil film

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 release hazardous substances even at a temperature of 120 ° C. Also, the reflective properties of the film are very important in the construction of 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 foil; with the same heating power, you can get an increase in the temperature in the premises by 2 ° C.

But reflective vapor barriers need to be applied wisely. So, it is not recommended for internal insulation of buildings made of heat-consuming materials (brick and concrete). Frozen walls will only worsen the microclimate. But in wooden house from logs or timber at internal insulation foil film will be very useful.

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

Properties and types of foil films

Foil film does not just protect the insulation from moisture penetrating from the premises. When using foil vapor barrier in a sauna, you can protect the inner lining from mold and rot, which inevitably appear due to constant condensation after turning off the steam room. Condensation simply does not settle due to heat reflection.

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 polymer base- differ in strength and durability, but more expensive;
with aluminum spraying - 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 foil thickness from 10 microns provide maximum level heat reflection (up to 97%), but subject to corrosion.

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

Kraft films can only be used in dry rooms - they are not suitable for kitchens or bathrooms. 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, wood and metal structures.

When insulating attic floor or when roofing in a residential attic, R Termo foil film allows you to keep warm, 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 ° C. The strength is indicated by a breaking load of 150 N along and 130 N across - the Ondutis R Termo film can withstand an adult and rather well-fed person.

Installation of foil films

The installation process of foil vapor barrier practically does not differ from the usual one:

The film is rolled horizontally and begins to overlap from bottom to top (10 cm). It is important not to confuse the internal and outside- foil vapor barrier is mounted only with the shiny side inside the room.
TO wooden structures it is nailed with an assembly 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 provide a vapor barrier, all joints are first fixed with mounting tape, and then glued with metallized tape. All passages - chimneys, pipes, electrical cable exit points - are also glued with mounting tape.
A timber with a thickness of 3 cm or more is nailed on top of 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 the energy for heating is consumed 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 polypropylene cloth, fiberglass, lavsan. These are components that are resistant to bursting effects, biological and chemical aggression.

The use of a durable non-woven or woven polymer backing allows you to create a reliable base for metal foil, which in itself cannot boast of special strength. At the same time, flexibility is convenient for installation. Such a composition excludes the possibility of dispersal of fungal colonies and decay.

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

Application methods

The structure of foil-clad vapor barrier materials has significantly expanded the scope of application. Now they are actively used in insulated roofs., are 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 unsettled attic, then the foil protection is installed together with waterproofing.

Often used as a substrate for floor coverings and underfloor heating systems, for thermal 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-clad materials can fulfill their reflex function. Between the ceiling of the steam room, the walls, inner lining lofts 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 screen for an attic 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 penetrated steam and condensate.

The necessary gaps are formed by installing a lathing from a metal profile or bar. The grids are set 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

Insulation 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 need to adhere to the generally accepted rules for construction:

It should be noted that accessories for foil insulation must be selected from the same manufacturer as the material. Of course, you can find on sale universal adhesive tape suitable for joining 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 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, first you should find out what proven and popular product options are on sale in the construction markets.

Energy-saving film DELTA®-REFLEX

These products have proven themselves well in the construction of roofs, among roofers they have 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 crumbling and damage. The reflection coefficient of this product is about 50%.

At subzero temperatures the film does not lose its flexibility, it is used in the arrangement of protection from steam from the inside and outside of the house. Can be used 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, therefore it is it that is bought most often, despite the high cost of production.

Reflective material "Izospan FD"

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

In terms of strength indicators, it is inferior to the first option, but it is able to outperform in 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 data sheet of the film, the temperature range is indicated as a separate line, 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... Here are just a more extended temperature operating range. The material serves flawlessly at a temperature of -60 degrees (at the Delta, the threshold is -40). And in the positive segment, the limit reaches +150 degrees.

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

Information on the use of foil vapor barrier film for construction is needed both by professional roofers and independent craftsmen... Correctly laid material is a guarantee that your beloved property will be equipped for a long period of time. Therefore, to such repair work you need to approach with all responsibility: 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 takes up foil material. Thanks to the reflective surface, the efficiency of the thermal insulation layer increases significantly, providing comfortable conditions in the dwelling. Lightweight, durable, with good soundproofing properties, foil insulation for the floor is becoming more and more 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 metallized polypropylene film or a thin layer of aluminum foil. The thickness of the insulation directly depends on the type of base.

Varieties of heaters

The insulation on polyethylene foam has a thickness of 2 to 10 mm and is produced in rolls. Usually it is used when installing a "warm floor", with further filling of the screed, and as an insulating substrate for some types of floor coverings. Self-adhesive material is especially popular, the installation of which takes a minimum of time. The insulation has many varieties, of which the most popular are Izolon, Ekofol, Folgoizol, Penofol and Isoflex.

Insulation based on fiberglass and mineral wool has a thickness of 50 to 100 mm, commercially available in the form of rolls and plates. It is used for warming interfloor ceilings, thermal insulation of baths and saunas. Basalt insulation with a foil coating 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, Park, 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 exposed to dampness and heavy loads. For the convenience of laying heating pipes, special red markings are applied to the foil coating.

Insulation properties

Foil heat insulators have the following properties:

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

Floors with such insulation will never get damp, do not require processing protective equipment will last much longer. Most foil-clad 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 is of great importance. Aluminum foil perfectly reflects heat, but it breaks down under the influence of alkalis in concrete, and metallized film is not susceptible to such effects. That is why insulation with an aluminum layer is not used under concrete or cement screed... The thickness of the reflective layer is no less important: some manufacturers make a simple spraying over the heat-insulating base, which significantly reduces the effectiveness of the insulation. The thinner the layer, the easier it is for thermal radiation to pass through it.

Thermal insulation of a wooden floor

For work you will need:

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

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

Step 1. Carefully prepare the base: remove the baseboards, remove debris and dust, process the surface grinder or by scraping. If there are gaps, you need to seal them up with putty.

Step 2. To preserve the wood, the floor is primed with an antiseptic compound.

Step 3. After the primer has dried, the insulation roll is brought into the room and measured the right amount material. Cutting is performed with ordinary scissors. Lay out the heat insulator on the floor with a reflective layer upwards, 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 topcoat- laminate, parquet, linoleum.

Insulation of a concrete floor

To fasten the insulation to the concrete base, a special rubber-based glue 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 the roll on the floor, starting from the wall. Measurements are taken and the excess is cut off with scissors. Next, the strip of insulation 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. Adhesive is optional and many builders do not use it. It's just that the insulation will not slip along the base and move during the installation of the finishing layer.

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

If the floors are very cold, after laying the foil-clad material, logs from a bar are mounted, placed 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 removed with putty or cement mortar.

Step 2. Roll reflective insulation is laid, tightly joining the material. All joints are glued with metallized tape.

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

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

Step 5. Mix the mortar and fill in the leveling screed. When the surface is dry, you can lay the finished floor.

Laying panel material

Reflective insulation in slabs is mounted mainly under warm floors, although it can also be used as ordinary insulation... A floating screed is made with foil mats and placed between the logs.

Floating screed

Step 1. Concrete surface floor slabs are leveled using and grinding. Dust cleaning.

Damper tapes Kermi

Step 4. Plates are taken with a metallized coating, since aluminum is corroded by cement. Glue is dotted on the base of the mats, after which the insulation is placed on the floor with a 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 tape, and then the heat-insulating layer is poured with a screed solution. Level the mixture with a wide spatula or a rule and leave to dry. After that, you can lay the finishing coating.

Video - Laying foil mats

Warming on lags

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

Step 2. A waterproofing material is laid on top of the logs and fixed with a stapler from the inside of the beams, well straightening the film on the floor. The edges of the canvases are overlapped by 10-15 cm.

Step 3. The space between the lags is filled with foil plates, laying them in one or two layers. The slabs 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 lag.If the gap cannot be left, a crate of 20x40 mm laths is stuffed on top of the lags.

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 is applied
	Elastic material, lightweight, waterproof and durable	0.040 W / mK	As a substrate for laminate and linoleum, mounted under warm floors
Penofol	Flexible, thin material, environmentally friendly, waterproof	0.037-0.049 W / mK	Can be used as a vapor barrier for conventional thermal insulation materials
Isover	Non-combustible, dense heat-insulating material	0.041 W / mK	For insulation of concrete and wood surfaces
Rockwool	Durable non-combustible material deformation resistant	0.39 W / mK	Insulation of floors on logs, heat and sound insulation of walls and ceilings
Foil polystyrene foam	Resistant to temperature changes, durable	0.037-0.041 W / mK	For insulation of a warm water floor, insulation of a floating screed

Video - Foil insulation for the floor

Vapor barrier is widely used in timber construction. Any vapor barrier films are attached to wooden structures in front of the insulating layer. For fixing, staples and a special stapler are most often used. Laying is done by butt-to-butt or overlap methods, and adhesive tapes are used to glue 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, as well as maintain during installation maximum strength with no deformation changes.

Heat-reflective or foil-clad film

Such a category vapor barrier films not only protects against the accumulation of steam, but also is 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 is guaranteed to reflect heat into the interior of the equipped room.

The use of material from the "three-in-one" category contributes to a significant simplification of all installation works and allows you to reduce the cost of consumables.

Polyethylene vapor protection

Standard types of polyethylene films used for vapor control. Manufactured with special reinforcement reinforcing mesh or fabrics that provide guaranteed durability.

Perforated film has rare micro-holes and has a stable 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 their polyethylene counterparts, the main of which are higher strength values and resistance to ultraviolet radiation. Polypropylene is capable of protecting structures from atmospheric precipitation for about twelve months in anticipation of the installation of roofing materials.

To minimize the formation of condensation, one side 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 rapid drying under the influence of air flow.

Anti-condensation polypropylene films have the main layer down, however, the creation of a ventilation gap remains relevant. Moderate cost and good performance strengths make this type of film very popular.

Material manufacturers and specifications

Modern vapor barrier films for construction market Russia is represented by several manufacturers at once, which produce fairly 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 breathable membranes are the best option under-roof insulation materials consisting of a continuous polymer film with two layers of polypropylene canvas.

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

Roll materials are easy to lay and join.

Vapor barrier "Izospan-V"

Manufacturer Izospan

In addition to a wide range of products, the manufacturer guarantees a reliable thermal insulation barrier and protection against moisture and weathering. The main options are:

membranes are vapor-permeable, durable, dense and UV-resistant;

propylene double layer membranes;

propylene laminated with foil.

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

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

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

Manufacturer Yutafol

Yutafol vapor barrier films are used as thermal insulation and hydro-protection.

The brands N, SP1, NAL Special and D.

The main application is the device of a vapor barrier in conditions of ventilated roofs of an inclined type, as well as when arranging a roof with soft tiles. When performing joint sealing, this roll material applied special view construction tape.

How to choose the best

The choice of vapor barrier is based on an assessment of the functional properties of the material. Diffusion type membranes are universal modern materials, allowing you to use in all kinds of conditions roof structure and in conjunction with all methods of insulation. Such a vapor barrier is several times more expensive than other types from the category of waterproofing films.

The waterproofing device on non-insulated roofs allows you to use an ordinary universal or perforated film from proven and well-proven 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 important criterion for choosing a vapor barrier film is price.

The cost of TechnoNIKOL films starts at 3000 rubles per roll. Vapor barrier films from TechnoNikol for arrangement pitched roofs cost about 1,150 rubles per roll, and the price of reinforced materials averages 1,875 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 for Izospan-V is several times lower than the cost of the 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 over a layer of thermal insulation;

the roll of material is rolled out perpendicular to the rafter system from bottom to top;

the standard overlap is from fifteen to twenty centimeters;

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

To create a fully functional vapor barrier in rooms with unstable temperature and humidity indicators, it is necessary to use appropriate materials, sharpened for specific specifics. Similar conditions are formed in buildings such as baths, attics, unheated summer cottages and outbuildings. Considering the peculiarities, installation of such a canvas as a foil vapor barrier would be a good solution. But, in order to eventually get a fully working protective layer there are many factors to consider.

Why do you need foil vapor barrier

As mentioned above, a vapor barrier layer with a metal aluminum coating is used in special cases and only in some types of buildings, why is it necessary?

Firstly, the most important function of a foil vapor barrier is the ability to keep structures from excess moisture getting into them. But, unlike other films and membranes, analogs with an 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 savings.

2 Secondly, in such premises 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 normal "working" range of most vapor barriers is from -40 to a maximum of +80 degrees. This makes their operation impossible in conditions of temperatures exceeding the mark of +100. Foil vapor barrier for a bath can easily withstand 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 the supporting 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 summer cottages, outbuildings, balconies and attics, which are poorly or not heated at all. This will both protect the structures from condensation 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 bricks or concrete, it is not recommended to use foil vapor barrier, this will increase their degree of freezing, which will generally worsen the microclimate inside.

Types of foil insulations 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 canvas has two layers - the base and the actual metallized coating. The base of the vapor barrier can be of two types:

Craft paper. Quite simple and cheap stuff, however, it is susceptible 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 is also of 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%.

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

Advantages of foil vapor barriers

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

Low weight. With decent functional properties, the foil vapor barrier has a low weight, which does not create large loads on bearing structures the buildings.
Insignificant thickness. The layer laid on the ceiling of the attic or floor does not in any way affect the volumes, as well as the height of the room due to minimum thickness base and the most metallized coating.
The convenience of use. Vapor barrier with foil can be easily mounted on curved lines of buildings, and in hard-to-reach places... In addition, it is very easy to make a workpiece 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 resistance. The presence of a foil layer makes the vapor barrier less susceptible to high temperatures... And as a whole, 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 panel, you can insulate various elements buildings adjacent to the installation site.

The produced assortments of reflective vapor barrier can be selected for any room based on 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 mildew.

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

Features of installation of foil vapor barrier

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

When assembling a "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 inner side roof slopes. The film is fixed with a stapler and counter-lattice slats.
In the bath, the 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 assembling layers, you should adhere to the technological rules for laying:

Everything wooden parts roof systems and other structural elements, you should carefully inspect 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 structure with an antiseptic. This will extend the life of the material and is guaranteed to eliminate problems such as the formation of mildew and mildew.
Vapor barrier layers on any planes (roof slopes, walls, floor slabs) must be solid. The porous structure does not require ventilation gaps... The mounted panels are connected hermetically using foil tape.
Laying of 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 overlaps the first below.
Laying the sheets of material, they make outlets 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 battens of the lathing, which in the future can be used as a base for the inner lining.
All panel joints are glued with foil tape.