Today, not a single construction site can do without vapor barrier membranes: they are used when sheathing a house, when laying a roof, when insulating a bath. The use of films extends the service life of structures, and also protects them from the appearance of fungus and mold. Vapor barriers are produced by many manufacturers, but Izospan (the Hexa company) has been among the leading brands for several years. Let us consider, using his example, how to select and correctly lay a building membrane or film.

The vapor protection of the roof and walls serves one purpose - to prevent the formation of a "dew point" inside the structure. This term refers to the temperature at which excess moisture converts to condensation. Indicators differ depending on the initial air humidity - for example, in most living quarters, the dew point occurs at a temperature of +10 degrees.

To understand what this is about, imagine the room as a balloon. If the air inside the room is warmer than outside (and in middle lane this happens almost 9 months a year), he will strive to go beyond the "ball". Cold air, on the other hand, tries to get inside the house. If you do not build a competent barrier that allows warm steam to come out, but does not allow icy air to penetrate inside, they will meet somewhere in the thickness of the wall and condense out. The result of such a rendezvous is usually not happy - wet structures freeze and become covered with stubborn mold.

Dew point offset

How does a vapor barrier film work? When using it, moist air comes out without lingering in the insulation, the dew point shifts and condensation does not fall out. The installation of the membrane is not always justified. If there is no temperature difference, then the dew point will not be formed either. But in many cases Izospan is necessary:

• when insulating external walls with mineral wool;
• in frame wall structures;
• on ventilated facades;
• on pitched and flat roofs insulated with bulk or fibrous materials;
• in buildings where there is no constant heating (summer cottages, country houses);
• in rooms with high humidity.

It is better to entrust the selection of a vapor barrier to a specialist. Of course have general recommendations but in each case there are many factors to consider. The most important of them is which side to the insulation to lay the vapor barrier.

Technical characteristics of Izospan

Types of vapor barrier Izospan

The site isospan.gexa.ru presents a wide range of membranes for all occasions, but we will consider the most common ones.

First, let's learn a few important terms:

1. Vapor permeability - the ability of a material to pass steam. The given data are the result of the Izospan inspection at the certification institute of the Central Research Institute of Industrial Buildings.
2. Maximum tensile force — The highest tensile force recorded during testing without breaking the material. Measured in the longitudinal and transverse directions.

All types of vapor barrier films are represented in the Izospan trademark

Waterproofing windproof vapor-permeable membranes

The materials are intended to protect the building structure and insulation from unfavorable factors: the accumulation of condensate, as well as the ingress of moisture and wind from the external environment. Membranes work only in one direction, so the question of how to install a vapor barrier is very relevant.

The vapor barrier is overlapped

Comparative characteristics

View	Areas of use	Peculiarities	Water vapor permeability, not less	Roll area, m 2
Izospan A	frame walls outdoor insulation ventilated facades	Laying from the outside of the insulation - under the wall cladding	2000	35,70
Izospan AM	frame walls outdoor insulation ventilated facades attic floors insulated sloped roofs	Three-layer membrane. Fits without ventilation gap. Maximum tensile force - 160/100 N / 50 mm.	880	35,70
Izospan AS		Three-layer membrane. Fits without ventilation gap. Maximum tensile force - 190/110 N / 50mm.	880	35,70
Izospan A with OZD	ventilated facades	Used when conducting welding works or using a blowtorch. The composition contains fire retardant additives.	1800	70
Izospan AQ proff	frame walls outdoor insulation ventilated facades attic floors sloped roofs with and without insulation	Three-layer reinforced waterproof membrane	1000	70

Vapor barrier waterproof films

Internal hydro-vapor barrier for walls and roofs protects the premises from the penetration of the smallest particles of insulation, and also prevents the formation of condensation.

Roof waterproofing scheme

Comparative characteristics

View	Areas of use	Peculiarities	Water vapor permeability, not less	Roll area, m 2
Izospan B	walls - frame and internal floors - attic, basement, interfloor insulated sloped roofs	Two-layer structure. Fastened with the smooth side to the insulation, the rough side outward. The second side is responsible for holding and evaporating condensate. Izospan S is also suitable for concrete floors.	1000	35,70
Izospan C			1000	35,70
Izospan D	concrete floor bases roofs - flat and non-insulated inclined basement floors	High strength woven fabric that resists mechanical stress. Can be used as a temporary roof.	1000	35,70
Izospan RS, RM	all types of floors concrete floor bases	Three-layer insulation reinforced with polypropylene mesh. Breaking load RS - 413/168, RM - 399/172.	1000	70
Izospan DM	roofs - inclined with and without insulation, flat all types of floors concrete floor bases walls - internal and frame	High-density woven vapor and waterproofing insulation. Protects insulation from weathering.	1000	70

Reflective insulation with energy saving effect

Metallized materials not only protect the structures of the house, but also reflect infrared radiation, reducing the heating time of the room.

Reflective vapor barrier conserves heat

Comparative characteristics

View	Areas of use	Peculiarities	Water vapor permeability, not less	Roll area, m 2
Izospan FB	saunas and baths	Lavsan-lined kraft paper. Can be used in a steam room.	Vapor-proof, waterproof	35
Izospan FD	warm floor reflective screens sloped roofs frame walls	Metallic coated polypropylene woven fabric. Breaking load - 800/700.		70
Izospan FS		Polypropylene non-woven fabric backed up with a metallized film. Reduces heat loss.		70
Izospan FX	floors - attic and basement warm floor reflective screens sloped roofs frame walls underlay for parquet and laminate	Foamed polyethylene, backed up with metallized lavsan film. Thickness - from 2 to 5 mm.		36

Important! Detailed information on each type of films and membranes is presented on the Izospan official website.

Installation of vapor barrier

Laying films and membranes does not require any special qualifications. The most important thing is to comply simple rules installation and make sure which side of the vapor barrier is put to the insulation.

General installation rules

• Before starting work, carefully study the packaging of Izospan. The manufacturer provides a detailed annotation for each type of vapor barrier.
• The material should adhere tightly to the surface; a small spade is required in the corner places.
• Woven and non-woven fabrics are overlapped (at least 15 cm).
• Along the perimeter, the vapor barrier is attached with a construction stapler, at the joints - it is fixed with metallized tape.
• When installing metallized materials, the shiny side always looks into the room. Films of this type are stacked end-to-end and secured with special adhesive tape.
• The two-layer Izospan vapor barrier is attached with the smooth side to the insulation, the rough side - inside the room. When installing floors, the scheme is reversed.
• Izospan AQ proff, AM, AS with the white side must adhere to the insulation.

Izospan vapor barrier is used for indoor and outdoor work

Instructions for the use of Izospan A

When insulating walls, type A is mounted on top of the insulation, while the inner side of the film should fit snugly against the thermal insulation, and the outer side should leave a small gap between the vapor barrier and the cladding. The material is laid from bottom to top (do not forget about the overlap) and fixed with adhesive tape.

During roofing works, Izospan A is rolled out over the rafters and a layer of thermal insulation, installation is carried out in the direction from the lower edge to the ridge. After the vapor barrier layer, there is a crate. The instructions for using Izospan AM are absolutely identical.

Important! The film should not stretch too much, but sagging should not be allowed. In the first case, the material may tear, in the second, it can clap under high wind load.

Instructions for the use of Izospan B

Subsequence installation works as follows:

• The film is attached to the rough sheathing or rafters with the smooth side to the insulation, the joints are sealed with a metallized tape.
• On top of the vapor barrier, metal profiles or wooden slats (recommended size - 40 * 50 mm) are installed for mounting the cladding.
• The finishing material is sewn onto the prepared slats, leaving a gap between it and the vapor barrier.

Important! When arranging floors, Izospan B is laid directly on a cement or concrete screed.

Izospan is attached over the lathing

Instructions for the use of Izospan S, D

Vapor barrier C and D is used in several areas:

1. On non-insulated pitched roofs, the material is laid along the rafters, starting from the bottom. The overlap is at least 15 cm. Fixing with a counter-rail is a prerequisite.
2. On flat roofs, the canvas is placed on the base (floor slabs or other surface). Overlap - from 20 cm.
3. The film is attached to the basement floors from below using a stapler or wooden slats.
4. When arranging concrete floors, Izospan is also laid out directly on the base.

Video instruction: installation of Izospan vapor barrier

As you can see, the range of vapor barrier is not limited to a couple of items, and each item has its own peculiarities in installation. Even if you decide to fix the film yourself, consult with professionals about the selection of material. It will be extremely costly to remodel a roofing pie or remove siding due to one mistake.

Is a line of polypropylene nonwovens designed for steam and waterproofing structures.

Izospan protects structural elements and insulation from:

• rain, snow and wind;
• moisture generated inside the building;

Isospan is used in structures:

• roofs;
• insulated walls;
• attic floor;
• floors on a concrete base;

The nonwoven fabric manufacturing technology is fully automated. But at the same time, quality control is necessarily carried out at each stage.

Izospan has a hygienic and fire certificate. Also, the products have been tested for compliance with building codes and GOSTs. As a result, a GOSTSTROY certificate was issued for it. Izospan has no analogues among similar domestic products.

Specifications

Isospan B, C, D, DM characteristics:

When choosing vapor barrier materials, you must pay attention to the following parameters:

1. Water vapor permeability.
2. Strength.
3. Density.
4. Water resistance.
5. UV stability.

Isospan A has the highest vapor permeability (3000gr / m2 / day), but it has the lowest water resistance index (330 mm WG), which makes it possible to use it only on roofs with an angle of inclination greater than 35 °. But nothing prevents you from using this material in.

Izospan AS and AD have a vapor permeability coefficient of 1000 and 1500 g / m2 / day, respectively, but they are favorably distinguished by a water resistance index - 1000 mm.w.st. As a result, they have become the main materials used in roof insulation.

If it is expected that the roof will remain uncovered for some period of time, it is necessary to use Isospan AQ proff. He alone has UV stability for 12 months.

Isospan D's best tensile load is 1068/890 N / 5cm, but it has the lowest vapor permeability - 3.7 g / m2 / day. This allows the material to be used as a temporary roof for 3-4 months.

Isospan B has a vapor permeability of 22 g / m2 / day, and a rupture rate of only 130/170 N / 5cm. In this regard, it is necessary to involve qualified specialists in its installation and not leave the material in the open air.

Izospan C is an intermediate option.

Peculiarities

1. Polypropylene film with a smooth top and fleecy bottom. The villi are necessary to trap condensing moisture and prevent it from rolling onto finishing materials. Installed in front of the insulation in such structures:
   • insulated roof;
   • walls;
   • overlapping;
2. Laminated fabric with a smooth and fleecy side. Due to the increased density, the field of application of this material is expanding. It is used:
   • On unheated roofs, as moisture insulation.
   • In ceilings (including above basements and attics), as a vapor barrier.
   • In floor structures.
   • In a concrete screed, as a hydro-barrier.
3. Polypropylene fabric laminated with a film. Izospan D is widely used as:
   • Additional moisture insulation on unheated roofs.
   • Vapor barriers for any structures requiring protection from water vapor.
   • Waterproofing layer in the screed.
   • Temporary roof.
4. Diaphragms marked A, AS, AM, AQ proff protect the insulation from getting wet, weathering and drain condensate from the roofing or wall cake into the drainage system. Benefits of using:
   • Remains of moisture trapped in the insulation layer from the room are easily removed.
   • The likelihood of penetration into thermal insulation material atmospheric precipitation.
   • It becomes impossible to weather mineral wool.
5. Membrane A. The polypropylene membrane has a smooth water-repellent side and a rough, condensate-retaining side. A membrane of this type has a low coefficient of water resistance, therefore its main purpose is to protect the insulation on the facade.
6. Izospan AS, AM, AQ proff. AS, AM are a membrane made of a vapor-permeable material and a dense, air-tight backing. Used to protect:
   • Frame-type walls.
   • Ventilated facades.
   • Insulated roof.
7. Heat-reflecting vapor barriers FB, FD, FS, FX trap in the room the smallest particles of moisture and radiant energy. Advantages of using thermal insulation reflective films:
   • Heat loss through the building envelope is reduced.
   • Heating costs are reduced.
   • Eliminates the likelihood of mold formation in wet rooms;
8. Steam barrier FB. Izospan FB is made of kraft paper, which is covered with a layer of metallized lavsan. Due to the fact that the material is environmentally friendly and can withstand temperatures up to + 120 ° C, it is used to insulate walls, roofs and saunas.
9. Vapor barrier FD, FS. Izospan FD, FS is a polypropylene film reinforced with a metallized layer. Isospan FD uses a grade D vapor barrier film as a base layer, while FS uses grade B. Manufacturers recommend using the described vapor barrier for interior decoration:
   • steam room;
   • attics;
   • as a heat-reflecting screen;
10. This material is polyethylene foam backed up with a metallized film. Polyethylene with a layer of bubbles is an excellent heat and sound insulator, and the metallized layer prevents heat leakage, retains steam and water. Izospan FX is the most cost-effective, safe and durable steam, noise and heat insulator. Its disadvantage is the maximum operating temperature - + 90 ° С, which makes it impossible to use it in steam rooms. It is actively used as:
    • Substrates when installing a warm floor.
    • Reflective screen for.
    • Insulation for mansard roofs in tandem with classic materials.

Use of reflective films to insulate walls and ceilings is possible only in rooms with forced ventilation, since these materials have zero vapor permeability.

Pros, cons and varieties

Heat reflective vapor barrier film

Advantages:

1. Environmental Safety.
2. Wide range of.
3. Affordable price.
4. Reliability and durability.
5. Persistence to the formation of mold.

Disadvantages:

1. Low durability to the fire.
2. Carries out its functions only when properly installed.

By appointment, the material is divided into three types:

1. Steam and moisture insulating films.
2. Moisture and windproof vapor permeable membranes.
3. Heat reflective vapor barrier films.

The first type includes vapor barrier films of grade C, B, D that protect the insulation layer from moisture evaporating outward through the enclosing structures.

The advantages of using a vapor barrier film:

1. The service life is increased insulation.
2. Reduces the likelihood of condensation and contamination of structures with fungus and mold.
3. The possibility of penetration into the premises is excluded volatile insulation particles.

Mounting

Installation diagram of isospan on an insulated roof

To lay the material you will need:

• roulette;
• hammer;
• construction stapler;
• nails;
• wooden slats;
• Scotch;

Isospan laying on the roof:

1. Roof insulation begins with fixing the vapor barrier film(B, C, D) to the structural frame or to the rough skin.
2. Fix the material with staples or galvanized nails. For additional sealing, the seams are fastened with special tape isospan SL or KL.
3. The sheets are rolled horizontally in the bottom-up direction. An overlap of 15-18 mm is made between adjacent canvases.
4. During installation, you need to monitor the tight fit of the film to the insulation.
5. Over thermal insulation A, AS, AM, AQ proff.
6. Isospan A is fastened with antiseptic locks to the rafters nails or self-tapping screws, so that a gap of 5 mm is formed. Izospan AS, AM, AQ proff, on the contrary, should fit snugly to the insulation. Therefore, it is attached to the rafters with staples or galvanized nails.
7. Installation starts from the bottom of the slopes. Along the slope overhang, the membrane is inserted into the gutter. The canvas is rolled horizontally, making sure that there are no distortions. It is important to secure the material with an interference fit. The permissible sagging is no more than 2 cm. The canvases should overlap each other by 15 cm horizontally, and 20 cm vertically.
8. So that condensation can evaporate, in the area of ​​the ridge and in the lower part of the roof, ventilation holes are provided.
9. Over the vapor barrier membrane mount the crate.

Izospan will perform its function only if it is properly laid. The fleecy side of the material should face the room, and the smooth side should face the insulation.

It is worth paying attention to the fact that Isospan A is the most available material, but its installation, due to the need to create a ventilation gap, is more expensive than the cost of stronger and more durable counterparts.

Wall insulation:

1. For ventilated facades Isospan A and AM are suitable. In cases where there is a possibility of fire, use a material with OZD.
2. The membrane is fixed on top of the insulation with the smooth side out. The sheets are rolled out so that there is an overlap of 10 cm.
3. Isospan is fastened along the building frame with staples. On top of the vapor-permeable membrane, the locks are vertically fixed, on which they are attached facing material... To prevent the effect of acoustic pops from appearing during operation, there should be no loose and sagging sections along the entire length of the canvas.
4. To remove moisture, the design necessarily provides for a ventilation gap in the lower part of the skin. Izospan is laid so that the moisture accumulated under the casing drains into the drainage system.

Izospan is a non-woven building material that is used to insulate residential and non-residential premises. In addition, it is essential for moisture and water resistance. This is especially important when creating a plan for a house with an attic and a garage, which must be properly insulated with water and heat.

The reader will find out in this article what types of isospan exist, what advantages this material has.

Izospan: material characteristics

Isospan film is now very common in the construction market. It is used as the first barrier layer during the installation of insulation: it excludes the ingress of moisture on the main insulation layer of expanded polystyrene or other insulation. The material consists of pure polypropylene, is completely synthetic, therefore it does not completely absorb water. When creating an insulation plan, Izospan should be taken into account in the work.

Attention! Izospan is recognized as a very effective material for insulating attics, garages, one-story buildings.

An attic is an attic space that can be used for storage or living space. The roof itself becomes the walls of this room, which should be well insulated. Izospan insulates and protects against moisture and wind, maintaining a comfortable temperature inside the attic and the whole house.

Similarly, isospan coating is used to insulate garages and other one-story non-residential premises:

• protects metal from corrosion, wood from decay;
• prevents the formation of condensation and moisture insulation, which reduces the thermal insulation properties;
• reflects air currents, protecting the room from cooling and drafts;
• maintains a stable indoor temperature, does not release heat.

The following advantages of isospan can be distinguished:

• waterproof;
• durable and environmentally friendly (does not emit harmful impurities);
• has high elasticity;
• protects from ultraviolet radiation;
• protects from the wind;
• does not release, reflects heat;
• withstands high pressure;
• durable (lasts about 50 years);
• retains its properties in the range from minus 60 to plus 80 degrees Celsius.

In terms of creating comfortable conditions inside living quarters, Izospan plays important role, especially when arranging a house with an attic, garage and other one-story extensions in the Russian climate.

Varieties of material, their technical features

Now high-quality manufacturers create pure polypropylene and a film from it using technological equipment, controlling the quality of production. Domestic companies are opening in Russia that offer building materials similar in quality to foreign companies and more favorable in price.

When choosing products, you need to focus on the availability of quality and safety certificates from Isospan. Famous manufacturers coordinate their production plans with legal requirements.

Now, when decorating houses and non-residential premises, 4 main modifications of isospan are used, which have their own characteristics.

Izospan A

This is a film (membrane) that perfectly waterproofs and helps to remove moisture, its vapors, from the insulation. This modification is used to protect against wind and water, increasing the service life of the insulation. It is used for insulation of private houses, attics, garages and any other premises.

This isospan is resistant to mechanical stress and pressure, completely neutral to biological effects (mold, bacteria, etc.). Can stretch:

• longitudinally by 190 mm;
• transversely by 140 mm.

The material is fixed from the outside of the insulation as an additional barrier. For example, when insulating the attic, it is mounted on the roof with an overlap in wide strips.

Important! The smooth surface should remain outside, the film itself should not come into contact with the insulation material. Otherwise, Izospan will not be able to waterproof the room and insulation with high quality.

It is necessary that the membrane lies flat, does not protrude, swell or sag. Izospan A is fixed with wooden slats and nails.

Izospan A can be seen in the photo:

Izospan V

This modification perfectly blocks the way for water vapor, which makes it possible to exclude the impregnation of the insulation with steam.

Important! When creating a garage plan, it can be very important to avoid moisture build-up in the room where the vehicle is stored.

Izospan B is two-layer, used:

1. On pitched roofs.
2. On the walls: external and internal.
3. To preserve the floors in the basement, attic (attic).
4. In garages and other non-residential premises.

The vapor permeability index is 7, the material can also stretch: in the longitudinal direction by 130 mm, in the transverse direction - at least 107 mm.

Each layer of this material has its own functions:

• the fleecy layer retains moisture and condensation;
• the smooth part allows you to firmly fix the film with insulation.

Unlike the previous modification, Isospan B is mounted on the inside of the insulation. Fixed from bottom to top and overlapped. In order for the film to capture vapors, condensate, there must be a free space of at least 5 cm above the fleecy layer.

The appearance of Izospan B packaging can be seen in the photo:

Izospan S

It also consists of two layers, but is used to protect an insulated roof, floors between floors, floor insulation. Possesses high strength.

The film is used for steam and water insulation:

• non-insulated pitched or flat roof;
• frame, load-bearing walls;
• wooden floors parallel to the floor;
• concrete floor.

1. Installation of non-insulated roofs (slopes) is carried out with an overlap (with a depth of about 15 cm), and is also attached using wooden battens. When arranging the attic of a house, this material perfectly insulates the room from moisture from the environment.
2. If speak about wooden floors, then here the film is attached directly to the insulation with a small free space from the floor (4-5 cm).
3. When insulating a concrete floor, Isospan C is placed directly on the floor and pulled together on it.

Izospan C can be seen in the photo:

Izospan D

This modification is very durable, capable of withstanding a lot of pressure and stress. It is used for finishing roofs. In terms of waterproofing and protection against condensation, it perfectly withstands even a large crust of snow on itself.

Great for arranging the attic of a house or garage in regions with heavy snowfall. The material protects wooden structures and non-insulated roofs. Izospan D is insulated:

• flat and pitched roofs;
• concrete floors and ceilings at the level of the basement of the house.

The high strength of the film allows you to protect the living area from wind and moisture, even in cases where the roof is permeable to moisture.

It is also overlapped horizontally in strips, fixed to the roof rafters of the house with slats. Installation on a concrete floor is similar to the previous modification of Isospan, because Isospan C and D are in many ways similar in their characteristics.

Izospan D can be seen in the photo:

The main modifications are described above. building material, there are also varieties of these modifications that have different densities or additional qualities, for example, flame retardant additives, which give greater fire safety and protect against fire.

Also, manufacturers took care of the creation of additional consumables in time, which allow insulating seams and minor damage. We are talking about Isospan tapes - these adhesive tapes allow you to isolate seam lines, uneven surfaces. It is enough that the working surface is dry and clean - Isospan FL, SL scotch tape will ensure good impermeability of such places. There is even a metallized tape with a high durability.

Important points for the installation of isospan

In the instructions for the use of isospan, the following points can be highlighted:

1. Laying this insulating material does not require any special knowledge, it can be done by hand, taking into account individual characteristics membranes.
2. The sales kit always comes with instructions, which must be read carefully and acted upon. For example, if you fix the isospan with the reverse side, then all the work will be meaningless - no isolation will happen.
3. Fastening to a tree is carried out with a stapler, one should not forget about sealing the seams, possible cracks using Isospan adhesive tape.
4. When a heat-insulating film is mounted, the metallized part should look inside the room, and the laying work itself is done joint-to-joint, without overlap. The seams are also sealed.

Izospan allows you to make life in your home comfortable and warm. The use of this film in the basement or in the attic extends the service life of the truss system, wooden floors, and creates a stable microclimate in living quarters. Insulation of the garage from moisture and condensation allows you to make the room dry and safe for the metal covering of the car and other equipment.

Modern technologies greatly simplify the arrangement of your home. Approaching the issue responsibly, each person will not be aware of the problems in their home for a long time!

Izospan materials are comfortable and durable films for construction with various purposes and application features. They are distinguished by high performance characteristics and, depending on the modification, can be used as a moisture, steam and wind protection layer at almost any stage of construction or finishing work.

Wind- and moisture-proof protective membrane films

Membrane films used to protect structural and heat-insulating elements of buildings from weathering, sedimentary moisture and condensate are made of polypropylene, known for its durability, environmental safety and resistance to various aggressive substances and microorganisms. Izospan windproof membranes have several modifications:

• Izospan A is a single-layer membrane with windproof and moisture-proof properties; it is used when performing thermal insulation of walls and roofs for wind and moisture protection of insulation. The outer side of the film is smooth, with water-repellent properties, the inner side is porous, due to which moisture is removed from the insulation layer.
• The two-layer version - Izospan AM, is distinguished by a high-strength backing layer, which protects the membrane film from damage during installation and operation. Possesses high water-repellency.
• Izospan AF modification is a wind and moisture protective film with fire protection, made using membrane technology. Fire protection allows Izospan AF to be used in lightly combustible wooden buildings, as well as for wind protection of easily combustible insulation materials.
• Izospan AS is a three-layer membrane film with increased water-repellent properties. It is allowed to lay directly on a layer of insulation, without arranging a ventilation gap.

Waterproofing and vapor barrier films

Izospan modifications used to protect all elements of a building from moisture vapors both inside and outside the premises, as well as in interfloor, under-roof ceilings. Made of polypropylene, laminated on the outside and porous on the inside. The loose structure allows accumulating condensate, but does not prevent its further evaporation, due to which the removal of moisture vapors from moisture-absorbing structures is achieved and the appearance of condensate drops on them is prevented.

• Izospan B belongs to vapor barrier films, it is used to protect walls, partitions, as well as layers of fiber insulation from the penetration of water vapor from the inside of the building. In addition to vapor barrier properties, they provide protection interior walls from mold and mildew, dust and particles of insulation. It can be used in buildings made of any materials.
• Izospan C has higher hydro- and vapor barrier properties, which makes it used as a moisture-protective film in unheated attics, as an under-roof hydro-vapor barrier and as a moisture-proof substrate for laying laminate and parquet flooring. High mechanical strength allows it to be used as a roof waterproofing for metal tiles. Izospan S is able to withstand roof leaks at the points of attachment and abutment to structural elements and perfectly protects the rafter system from getting wet and condensation.
• Izospan D is a universal vapor barrier for any structural elements, with very low vapor permeability and high density. It can withstand significant mechanical forces, including snow load.

Izospan DM is a modification of a universal vapor and moisture protective coating with increased strength, an anti-condensation layer and protection against UV radiation. The scope of application is much wider than that of Izospan D, it can be used as a temporary covering of roofs and walls in the process of construction and decoration.

Metallized films

Izospans with a metallized inner layer are presented in several modifications. Their field of application is due to the property of reflecting infrared radiation, due to which, in addition to steam and moisture protection properties, they provide additional thermal insulation of premises.

• Izospan FB waterproofing film with a metallized reflective layer is intended for internal protection of steam rooms of baths, saunas and other rooms with elevated temperatures, as well as for protection from moisture and condensation of heated under-roof rooms, attics, wall partitions and ceilings. Metallized lavsan cloth is used as a reflective layer.
• Izospan FD is a polypropylene film with metallization, the field of application is protection of roof and wall structures from wind, moisture outside the room, and from condensation of internal vapors. It can be used as an infrared screen. Possesses increased tensile strength, withstands significant mechanical loads.
• The Izospan FS modification is used as vapor and waterproofing of various structures, as well as an additional heat-reflecting layer when interior decoration... Has a lower density, respectively, a lower price.

The IZOSPAN trademark has been present on the domestic market since 2001, the products are manufactured by the Russian company GEXA in Tver. Inherent in materials of the Izospan brand specifications, high quality and durability allow us to supply products for construction from Tver on a par with foreign counterparts of European production. At the same time, Izospan costs less, which provides the domestic brand with constant popularity among professional builders and owners. country houses... We will tell you how Izospan waterproofing differs from vapor barrier, consider the range of products, including high-strength construction films. The technical characteristics characteristic of Izospan D make it possible to use the material as a temporary roofing covering.

Izospan are construction films, membranes and tapes designed to protect fiber insulation and wooden structures from blowing by wind and water, both in liquid and vapor form. Scope of application - multilayer building structures, mainly outdoor. These include pitched roofs, external insulation systems for buildings (ventilated facades). Films and membranes cannot be dispensed with in the construction of a modern frame house... They are also used when arranging wooden floor slabs... Let's take a closer look at the range and characteristics of Izospan, let's talk about the features of the use of materials in the specific conditions of private suburban construction.

In the photo Izospan D, which is covered rafter system... The developer did not have time to lay the roofing in a warm season, but this is not a big deal. Strong polypropylene film will withstand until spring, snow and strong winter winds will not damage it

Multilayer building structures and moisture

To understand how to use Izospan correctly, you will have to understand some issues of construction technologies:

Modern building technologies include various multi-layer structures. They are most justified and popular in low-rise construction. These are frame walls, pitched roofs, ceilings, ventilated facades. The supporting part of the structure - pillars, rafters, etc., is often made of wood. The gaps between them are filled with an effective heat insulator. As a rule, fibrous materials are used: mineral wool, ecowool (cellulose fluff).

In a multi-layer frame construction, a vapor barrier from the inside and a vapor-permeable membrane from the outside are required.

Such heaters, along with useful properties, also have disadvantages: they are blown through when exposed to wind and get wet under conditions high humidity... As a result, their thermal insulation properties are noticeably reduced. The wooden frame is also "afraid" of moisture. It enters porous materials from the air, in the form of water vapor. For most of the year, the humidity inside the house is much higher than outside. Accordingly, from the inside of the house, it is necessary to prevent the penetration of steam into the multi-layer structure. Isolate from steam. Outside the building, the air is usually less humid, which makes it possible to ventilate and dry the insulation.

If you provide good ventilation, free moisture escape from the insulation and timber frame, their moisture content will be minimal. Accordingly, vapor-permeable materials should be located on the outside in a multi-layer structure. The above is true for heated homes. For unheated and well-ventilated buildings, vapor permeability does not matter.

Please note: In a multilayer heat-insulated structure, INSIDE - STEAM PROTECTION, and FROM OUTSIDE - VAPOR PROTECTION. Not the other way around. If, for example, Izospan A and Izospan B are confused, the wall or roof will become waterlogged, which will inevitably damage the building.

From the inside, they are protected from moisture by a vapor barrier film (vapor barrier), and ventilation from the outside is provided by a vapor-permeable membrane (wind protection). Please note that the windscreen membrane must not come into contact with the roofing and wall cladding. To remove water vapor, there must be a ventilation gap between them with holes in the lower and upper parts of the walls and roof.

Differences between vapor-permeable membranes and vapor barrier films

On the construction sites and forums, you can read, and from the lips of builders and private developers hear such terms as "Izospan waterproofing", "Izospan steam waterproofing" and "Izospan film". And the sellers of building materials will also tell you about the "Izospan superdiffusion membranes".

In the case when the walls of a stone building are insulated using the ventilated facade method, vapor barrier is not only not required, but is strictly not allowed. All you need is a vapor-permeable membrane that protects the insulation layer from the street side

It happens that the speakers themselves do not understand the difference between the materials or use the terms incorrectly. Often this confusion leads to the wrong choice of materials, as a result of which the thermal performance of the enclosing structures deteriorates and their service life decreases. To avoid such mistakes, you need to clearly understand how the Izospan materials and their analogs differ, as well as what they are used for. In accordance with their purpose, they are divided into two groups: vapor barrier films and vapor-permeable membranes:

Vapor barrier films

Vapor barrier films are impervious to water, steam and wind. That is, they are practically sealed. They are made, as a rule, of polyethylene and more durable polypropylene; they can be reinforced to increase strength. They are also called "Izospan vapor barrier", but this definition is correct only to a certain extent. Indeed, the film is waterproof.

If it is used in the "pie" of a pitched roof, water condensation or leakage from a leaky roofing will not penetrate into the attic. But for underground structures and flat roofs The standard film for waterproofing Izospan B is not the best, it is not strong enough and weather-resistant. True, the characteristics of Izospan B, the cheapest film, are low, there is best materials which can be used for waterproofing concrete floors. But nothing more.

Reflective Izospan sheet is laid as insulation under the heating floor

Application of vapor barrier films:

• Protection against high humidity of multilayer insulated structures is mounted from the inside, from the side of the room. These are frame walls, pitched roofs and wooden floors on the ground floors of buildings without basements.
• Protection against condensation and possible leaks of rafter structures in an uninsulated ventilated attic. In this case, the vapor barrier is placed on the outside, under the roof covering.
  

  Please note: The vapor barrier can be placed in the "pie" of the pitched roof from the street side only if the attic is not insulated and well ventilated .

• In interfloor wooden floors, the Izospan film is placed under and above the insulation. Izospan for floor in wooden house plays the role of not so much a vapor barrier, as it prevents the spread of the smallest fibers of mineral wool into the premises.

The holes in the vapor-permeable membranes are large enough to allow water vapor to pass through, but too small to penetrate liquid water... Membranes often have a rather complex multilayer structure and during installation it is important not to confuse the orientation: the canvas turns outward with a strictly defined side

Vapor permeable membranes

Vapor-permeable membranes are single or multi-layer nonwoven fabrics with the smallest holes. The size of the holes and their number is such that the membrane is not blown by the wind, but with a difference in air humidity on the sides of the film, water vapor diffuses towards the side where the air is drier. This allows you to remove excess moisture from building structures, ventilate them. Liquid water, falling on a vapor-permeable membrane, is not able to penetrate the barrier, the surface tension force interferes. Of course, we are talking about a relatively small amount and pressure of water: individual drops or a little rain. If the membrane is left unprotected by the roofing or wall covering under heavy rain, water will flow through it.

Application of vapor barrier diffusion membranes:

• Ventilation of multilayer enclosing structures and their protection from liquid water (condensation). Located outside, from the street side. Frame walls, pitched roofs, wooden floors on the ground floors of buildings without basements.
• The membrane can be used in interfloor wooden floors, but Izospan film is cheaper.

Please note: A vapor-permeable membrane differs from a vapor barrier film in its ability to transmit water vapor. It is important to understand this difference.

It is clear from the diagram general principle application of Izospan materials: outside - vapor-permeable membrane, inside - vapor barrier film

What technical characteristics are important for evaluating the properties of building membranes and films

In order to understand the differences between Izospan materials, and also to be able to compare them with the products of other companies, it is advisable to know which indicators are most significant for assessing the properties of building films. An ordinary consumer does not need to go into details, measurement methods and calculation formulas, but the characteristics that are important for Izospan should be named:

• Vapor permeability - the ability of a membrane to pass water vapor, provided that the atmospheric pressure on both sides of the membrane is the same, and the partial vapor pressure is different. Characteristic - vapor permeability coefficient, unit of measurement - mg / (m · h · Pa).
• Resistance to vapor permeation - the ability of the film to retain water vapor, measured in m2 · h · Pa / mg.

Both vapor permeability and vapor permeability depend on the properties of the material and its thickness. The methods for determining and calculating the values ​​are given in SP 50.13330.2012.

• Water resistance - the water pressure that the web can withstand until the moment of leakage, is measured in millimeters of water column.
• Breaking load characterizes the strength of the web. This is the maximum load that a film or membrane can withstand without breaking. Measured in centi-newtons (H x cm).
• UV stability is the time (months) during which a material can be exposed to ultraviolet radiation outdoors without deterioration.

In the photo Izospan A, the marking of the canvas reflects the purpose of the material, its technical characteristics

Assortment and technical characteristics of Izospan

Depending on the purpose, the materials of the GEXA company are divided into four groups.

Vapor permeable membranes

We already know the purpose of vapor-permeable diffusion membranes: they protect multilayer structures from wind and external moisture outside buildings, ensuring the removal of water vapor from the insulation and the wooden frame. The abbreviation for Hexa membranes contains the letter "A". We repeat once again that building membranes and films are fundamentally different materials... If the seller or potential contractor uses the wrong term "Izospan A film" or an incomplete definition of "Izospan A waterproofing", this is a reason to doubt his qualifications. The manufacturer produces five types of Izospan A vapor-permeable membranes, the technical characteristics of which differ. There are differences in usage:

• ISOSPAN A is a single-layer membrane, the simplest and most inexpensive one. The low water resistance of Izospan A, the vapor permeability characteristics do not allow the material to be used in pitched roofs, it is used only in vertical wall structures, including ventilated facades.

• ISOSPAN A with flame retardants. The technical characteristics of Izospan As OZD are almost identical to the A grade, but the canvas has fire-fighting properties. It is recommended to use it for external insulation of wooden buildings.

• IZOSPAN AM is a multilayer membrane with increased water resistance, which makes it possible not only to use it in the "pie" of a pitched roof with high condensation, but also to place it directly on the insulation without a gap. This simplifies the roof structure and saves money.

• IZOSPAN AS, the technical characteristics of which in terms of vapor transmission coincide with the properties of the AM brand, are somewhat stronger, which is important for large roofs with a significant rafter pitch.

• IZOSPAN AQ proff is an extra strong membrane with high vapor transmission and water resistance. Recommended for all types of multi-layer ventilated walls and roofs of critical facilities. The most efficient, durable and expensive membrane.

Vapor barrier films

Construction films impervious to water, steam and wind. They are installed from the inside of multi-layer walls and roofs of heated buildings; they are also used to protect the walls and roofs of unheated buildings from the outside against the weather.

• IZOSPAN B is the least durable, but the cheapest vapor barrier. It is not worth counting on the technical characteristics of Izospan B to be high. Izospan V, whose characteristics in terms of strength and durability leave much to be desired, is perfect for utility structures, interfloor ceilings. For a responsible object, a house in which you are going to settle for a long time, it is worth using a more reliable and expensive film. For example, Izospan S, the technical characteristics of which are higher.

• IZOSPAN C is a film that can be used not only as a vapor barrier, but also as a waterproofing when installing floors on the ground and on a concrete base.

• IZOSPAN D is a two-layer extra strong vapor barrier film. The technical characteristics of Izospan D allow it to withstand the snow load; the canvas can be used as a temporary covering for a pitched roof. But no more than a period of UV stability, which is 3 months in summer and 4 in winter.

• IZOSPAN RS is reinforced with glass threads, which increase its tensile strength. Like grade "C", it can be used for flooring on the ground and even for waterproofing flat roofs. True, not as a coating, but only on the bottom of a multi-layer "cake" to protect the insulation from water vapor.

• IZOSPAN RM is a three-layer reinforced vapor barrier film designed for roofs and floors.

Reflective vapor barrier

Reflective insulation Izospan is a film, the technical characteristics of which allow us to say that the material combines four functions: insulation from steam, water, wind and thermal protection of building structures. It cannot serve as a full-fledged insulation, but the foil layer reflecting the infrared rays inside the premises reduces the heat loss of the building. Varieties:

• IZOSPAN FB is made of kraft paper and metallized lavsan, intended for baths and saunas.

• IZOSPAN FS is made of polypropylene and has a metallized coating. It is used in multi-layer structures and underfloor heating screeds.

• IZOSPAN FD is similar to the FS brand, but has increased strength.

• IZOSPAN FX is made of foamed polyethylene, coated with a metallized lavsan layer. Izospan FX insulation, the technical characteristics of which are quite high in terms of thermal insulation, are not very strong. Therefore, it is more rational to use it as a substrate for underfloor heating.

Connecting tapes

Tapes are construction tape on special bases, designed for gluing together different types Izospan canvases, sealing films and membranes. Separately, we will highlight SUL - a self-adhesive sealing tape. It has a different function. SUL is glued to the rafters over the already mounted membrane. The tape is designed to prevent moisture penetration into the wood through fasteners(nails, screws). Recommended for use when the roof slope is less than 22º.

We are only in general outline mentioned the range of insulating materials of the company GEXA, you can find out more about their use on the manufacturer's website.

You can determine how to properly use Izospan materials by carefully studying technical materials on the manufacturer's website. Under the roof, outside, the builders install the Izospan AM membrane, and from the inside, from the attic side - Izospan D, the photo illustrates this well

In conclusion, we will say that we have told only a small fraction of what you need to know for successful construction. own home using multi-layer building structures. This task requires from the performers certain knowledge and careful observance of the technologies prescribed by building codes and recommended by manufacturers. If you are not going to deeply study this issue on your own and do the work with your own hands, entrust the design and construction of your own home only to trusted specialists.