Isospan vapor barrier film in technical specifications. Technical characteristics of the isospan film. Varieties of Izospan products

Is the upcoming choice of waterproofing materials difficult? I thought about this before, until I met the Izospan A wind and moisture protection membrane. Having gained experience in this matter, I am ready to talk about its purpose, basic properties, as well as the nuances of installation.

Material features

General information

Izospan A is a single-layer vapor-permeable membrane from a well-known Russian manufacturer of the same name. Its main task is to protect insulation or just walls from moisture and wind. Therefore, it is assembled from the outside before facing work.

The principle of operation of the membrane in terms of removing moisture to the outside is as follows:

Moisture collection. One side of the membrane has a rough surface. Thanks to this, it collects steam emanating from the room;

Moisture removal. Moisture accumulated on the surface seeps out through microperforation;
Removal of moisture. On the back side, moisture evaporates or rolls down.

From this diagram, it becomes clear which side to lay the membrane on - rough inside (to the insulation or the room). Be aware that improper placement of the film can make the film less efficient.

If all of the above is summed up, then this Izospan film performs the following functions:

Wall protection from wind;
Protection against atmospheric moisture;
Removal of moisture from the room;
Improving the insulating qualities of the insulation used.

Application area

Izospan a can be used in the following cases:

When installing ventilated facades;
When insulating roofs;
When insulating frame walls;
When insulating walls from the inside.

To achieve the greatest effect, Izospan vapor barrier b must be used together with windscreen in most cases. Unlike a diffuse membrane, a vapor barrier is not perforated, i.e. completely sealed.

Therefore, Izospan b is always mounted on the inside. Thus, the film protects the insulation and the structure from moisture penetration from the room.

After the walls are protected with Izospan insulation, they completely stop breathing. Therefore, such housing needs effective ventilation. Otherwise, the level of humidity in the premises will increase, which will lead to many negative consequences.

Performance properties

The material in question has both pluses and minuses, which must be taken into account when buying wind and moisture protection.

Advantages:

Low cost.The price of a roll of membrane is on average 1600-1700 rubles. This is the cheapest Izospan model among vapor-permeable membranes;
High vapor permeability.The film "breathes" perfectly.

Disadvantages:

Low moisture resistance.If water accumulates on the surface of the film, it can flow inside;

Limited scope.The membrane in question does not belong to roofing materials, its main purpose is to protect walls from moisture. For roofing, it is better to use a multilayer membrane such as Izospan D.

True, the manufacturer allows the use of Izospan A on roofs with a slope greater than 35 degrees. The only thing is that it is not recommended to use it in conjunction with metal roofs (corrugated board, metal tiles, etc.), regardless of the angle of inclination.

This film is also not suitable for the floor. Izospan B should be used for waterproofing ceilings and floors.

Izospan A burns well. Recently, however, a modification of this material has appeared with the prefix OZD, which means "fire retardant action". Such a membrane can protect the surface not only from moisture, but also from fire.

Specifications

The vapor-permeable membrane has the following technical characteristics:

Installation technology

Frame-type wall insulation

First of all, we will consider how to install the film yourself on frame walls. This procedure can be broken down into several steps:

So, the work is done as follows:

Illustrations	Description of actions
	Materials.To isolate the frame wall, in addition to the Izospan materials, which I described above, you will also need: Self-adhesive butyl rubber tape.You can use SL tape from Izospan or an analogue from other manufacturers; Wooden slats section 30x40 mm. In addition, a construction stapler is needed to fix the film. These materials are used not only for the insulation of frame walls, but also in all other cases. Therefore, I will not list them further.
	Installation of vapor barrier: Stick butyl rubber tape on the racks from the inside of the walls; Roll the roll across the uprights and glue it with the glued double-sided tape. During the installation process, make sure that waves and folds are not formed. Do the work from the bottom up. When gluing the second sheet, an overlap of at least 150 mm must be ensured; Glue the junction of the canvases with adhesive tape; Additionally secure the vapor barrier with a stapler. The vapor barrier film must be positioned with the rough side towards the room.
	Installation of a windproof film.After laying the insulation in the space of the frame, a wind and moisture protection film is attached to the walls according to the same principle as the vapor barrier. As I said above, the membrane is mounted with the smooth side out. The edge of the film must ensure the drainage of moisture from the walls to the drainage drainage of the basement. Therefore, from below it should have a slight curl at low tide.
	Installation of a counter-lattice.A counter-lattice must be fixed on top of the film. Depending on the type of facing material, the battens can be installed both vertically and horizontally. In the same way, you need to install the slats on the inside of the walls. During the installation of the rails, make sure that they are all located in the same vertical plane. It depends on how smooth the walls turn out to be.

Insulation of a ventilated facade is carried out in the same way, therefore we will not consider this procedure separately.

Membrane installation for internal wall insulation

The process of insulation insulation with internal wall insulation has some of its own nuances. The main one is the need to arrange a ventilation gap between the wall and the membrane. It allows moisture to evaporate, allowing walls to dry out.

The instructions for performing this procedure look like this:

Illustrations	Description of actions
	Installation of rails.The slats must be fixed to the wall in a horizontal position with a step of 2 cm horizontally and 50 cm vertically.
	Membrane assembly.Attach the membrane to the rails. To create a ventilated gap between the film and the wall, be sure to place the last stretch. For the ventilation gap to work, it is necessary to make through holes in the wall below and under the canopy. The holes can be insulated with mineral wool and closed with a net.
	Installation of vapor barrier.After the installation of vertical posts and wall insulation, a vapor barrier is attached to the inside of the insulation in the same way as on frame walls.
	Installation of rails.To provide a ventilation gap between the finishing material and the vapor barrier, the slats must be fixed to the frame.

Installation of the membrane on the roof

The moisture protection membrane is mounted on the roof before the roofing material is laid. This work is carried out in the following sequence:

Illustrations	Description of actions
	Membrane assembly: On the rafters (across the rafter legs) the membrane spreads in strips from bottom to top; As in the previous cases, the film is fixed with a stapler; On top of the film on the logs, you need to stick butyl rubber tape. In addition, you need to glue the joints of the canvases.
	Installation of a counter-lattice. Slats are attached along the lag, as shown in the photo, which provide a ventilation gap between the membrane and the roofing material.
	Installation of the lathing.Planks are attached across the rails, on which the roofing is subsequently laid.
	Installation of vapor barrier film.To protect the insulated roof from moisture from the inside, Izospan b is attached to the rafters from the side of the room according to the scheme described above.

This completes the roof insulation.

Output

So we figured out what the Izospan A membrane is, in what cases and how it is used. Additionally, watch the video in this article. If at some point you have questions, leave them in the comments, and I will be happy to answer you.

The device of moisture and vapor barrier is a very important stage of construction. One of the best materials used for this purpose is isospan. It belongs to the category of relatively new products used in the protection of structures. The manufacturer provides a wide range of insulating films that differ in purpose.

You will learn everything about the range of membrane films labeled as isospan A, B, C, D from our article. We have described in detail popular insulating materials and provided their technical characteristics. Do-it-yourself DIYers will find installation guides and helpful tips here.

For the most part, isospan is produced in the form of a membrane or film. Both versions have a vapor barrier function. There are types that are 100% waterproof and unilaterally permeable to moisture. If we consider the types of this material separately, then each is intended for separate tasks.

The term isospan hides four broad groups - A, B, C, D. They stand out for their individual design features.

Isospan is used in the construction, installation of cold roofs, construction of baths, as an insulator for enclosing structures. The material is especially effective as protection of insulation systems and wooden elements from putrefactive processes, and metal ones from corrosion.

There is isospan used inside buildings, and other varieties are intended for outdoor use. Isospan is also available for universal use. In any case, its use makes it possible to significantly prolong the operation time of the insulation, which, under the influence of moisture, quickly loses its properties.

There are three main groups of isospan: moisture and windproof, steam and moisture proof, vapor tight. Materials included in the second group are used for interior finishing work

Vapor-proof isospan is used for both internal and external work. According to the functionality of the material, it is divided into classes.

Insulation material group A

Material marked with the letter "A" belongs to the first group. It is characterized by high density, therefore it is indispensable for warming attics, walls, roofs. Fungi and mold do not develop on it.

This diffusion membrane retains water, but steam passes through it unhindered. Polypropylene is used for manufacturing. It strengthens and protects thermal insulation from the influence of outdoor atmospheric moisture or cold air from the side of the room, which is not heated.

Izospan A is an excellent wind barrier when performing ventilated facades. It neutralizes the consequences caused by the onslaught of side winds that favor the escape of heated air from the thermal insulation layer.

In order for Izospan A to fully reveal its capabilities, it is necessary to follow the technology exactly during installation. Since air jets pass through it only unilaterally, in no case should the sides be confused. Otherwise, the insulating layer will get wet due to the accumulation of moisture in it.

Isospan A is produced in rolls with a width of 1.6 m. Material area in a reel is 35.7 m². Optimum temperature limits for operation are -60 - 80⁰. For three, or even four months, the membrane can be influenced by ultraviolet radiation without loss of characteristics. Subsequently, these aggressive rays will gradually reduce the UV stability of the material.

Izospan marked with the letter A may contain fire retardant additives. Then, to all its characteristics, one more is added - protection against fire. This brand belongs to the G1 flammability group, and according to the flame propagation rate - to the RP1 group.

The material can withstand quite high breaking forces - from 125 longitudinal and from 95 N / 5 cm transverse. This is facilitated by special additives that strengthen the structure of the material.

The vapor permeability of the material is at least 3500 g / m² day. Water resistance parameter - 330 - mm. water. Art. Based on these characteristics, it is advisable to use Isospan A when installing ventilated facades, frame enclosing structures, roofs with double lathing and slopes at an angle of 35⁰.

The 3-layer AS membrane well insulates both wall and roof structures from street moisture and steam. The presence of such a barrier guarantees the safety of the insulation

In contrast to the A-group membrane, the AM film has a two-layer structure. She also found application to protect insulation, roofing elements from condensation, weathering.

These types of insulation have a number of differences:

AS - the most durable, in addition, stands out for a rather significant service life, but the steam transmission rate is only 1000 g / m2 per day.
AND - the best view in terms of steam permeability.
AD - strong membrane with a vapor permeability of 1500 g / m² per day.

There are differences in terms of installation. In the case of choosing grade A, an air gap is required, otherwise the steam will be discharged ineffectively. Membranes AS, AD are mounted directly on the insulation.

The second group marked B

This vapor barrier has a slightly lower price.

The technical parameters of Isospan B are as follows:

composition - polypropylene;
application temperatures - -60 - 80⁰;
water resistance - 1000 mm of water. With t. Minimum;
uV resistance - 3 - 4 months;
minimum vapor permeability - 7 gr. per m² per day;
The structure is two-layer.

It is used as a roofing film in frame enclosing structures, in interior partitions. On the one hand, it is smooth, the opposite side is rough, it is on it that moisture is retained and it evaporates.

With its help, the building is insured against penetration inside, walls, systems in a private house.

Isospan grade B is laid so that the rough side is on top. It is a high-quality steam and waterproofing for rooms with traditionally high humidity - bathrooms, toilets, showers, basements

The price of this brand is the most democratic. Unlike grade A, this material is not attached from the top of the insulation, but from its bottom side. Do it from the bottom up, then overlap. For better capture of water vapor, a 5 cm gap above the rough layer is required.

Features of the material of group C

With regard to resistance to vapor permeability, water resistance, UV stability, this type of insulation does not differ from the previous material. Isospan brand C has the same temperature range: (-60) - (80⁰). The difference in breaking load, here it is greater - longitudinal minimum 197, transverse - 119 N / 5 cm.

The two-layer film is particularly durable. Polymer membranes of group C are used for waterproofing and vapor barrier for protection of attics, roofs with a slope of maximum 35⁰.

They are used as a waterproofing substrate for metal tiles, as it perfectly protects the rafter system from rain and melt water. In addition, it is a good waterproofing for different types of substrates. The material is also used in the case of concrete floors in places of high humidity.

Description of brand D products

A distinctive feature of Isospan D is its good resistance to UV rays. Tensile strength is also high - longitudinal breaking load - not less than 1068 N / 5 cm, 890 - transverse.

Due to its high strength, polypropylene fabric of grade D can easily withstand considerable mechanical forces during installation and operation, including the weight of snow. For this reason, it is quite suitable as a non-permanent roof that functions normally for about 4 months.

The material also showed itself well in the role of under-roof waterproofing in cold roofs. It saves wooden elements from the destructive influence of moisture penetrating from the outside, as well as wind, snow, which may end up there through leaks in the roof. It is also an effective waterproofing layer in basement ceilings.

Installation instructions for isospan

Steam, moisture and wind protection of a building is a complex event. Using glassine or plastic wrap is ineffective. Izospan is specially designed for this purpose and its high qualities have been tested in practice.

For installation, in addition to Isospan itself, a stock of tools and fasteners is required:

special scissors;
self-tapping screws;
construction stapler;
connecting tape;
metal profile or wooden slats.

It should be remembered that the membrane is attached to the walls both from the inside of the room and from the outside, and on the roof - only from the inside. Features of a particular type of isospan, found a display in the instructions for use of the material.

Mounting the diaphragm of group A

The best use of this thermal insulation, waterproofing, windproof membrane is to protect the frame wall of low-rise buildings from moisture and wind. It is mounted on the outside of the insulation layer under the outer finishing of the building.

The outer side of Isospan A does not allow moisture and wind to affect the state of the insulation. Internal - prevents the formation of condensation, because has the ability to remove steam

Isospan A is laid in accordance with its technical characteristics, carried out on top of the insulation along a special frame.

The technology is simple and does not require special qualifications:

The roll is unrolled and cut into panels of the required size.
Sections of the membrane are alternately placed on the frame horizontally with an overlap with the flat side outward, starting from the bottom, and moving up.
Secure the protection to the frame with an overlap using a construction stapler or other method. The minimum amount of overlap both horizontally and vertically is 100 mm.
The material is further strengthened. To do this, the stretched panels are pinned to the rafters with a construction stapler.
To seal the overlap, the joints of the panels are fastened with 2-sided Isospan KL tape.
Self-adhesive tape is laid in the mounting area.
On top of the isospan layer, wooden counter-rails are attached vertically to the frame. They are pre-treated with an antiseptic. The size of the slats is 40 x 50 mm. They act as a supporting structure for external cladding - in the form of lining, siding, etc.

A prerequisite is a ventilation gap equal to the thickness of the counter strip between the isospan layer and the outer skin. The bottom edge of the membrane is positioned so as to drain the flowing moisture into the drain of the building's basement.

Laying the film Am and As in the insulated pitched roof

The material protects the supporting structure and insulation from condensation collecting under the roof, as well as from snow, wind, moisture that enter through loose laying of the coating

The membrane is laid without a ventilation gap, so there is no need to arrange an additional crate between the insulation layer and isospan. Fasten it taut.

The sequence of operations is as follows:

The roll is rolled out and cut directly on top of the insulation.
The panels are laid out horizontally, turning the white side to the insulation. Start of installation - the lower part of the roof. The segments overlap horizontally and vertically by at least 15 cm.
Strengthen the membrane along the rafters with a stapler.
The joints are fastened with solid 2-sided tape isospan KL.
The traces of fastening with nails or screws are closed - they are glued with a self-adhesive strip along the rafter legs and other elements. This is especially true for roofs with a slight slope - up to 22⁰.
Wooden antiseptic slats 4 x 5 cm are vertically fastened on top of the tape along the rafters.
The crate is mounted on the counter-rails. Based on the type of roof, it can also be a continuous flooring.

To eliminate the under-roof condensation between the front side of the film and the roof covering, a condensation gap is arranged using slats about 50 mm thick.

For free air movement in the space under the roof, the bottom of the roof and the ridge area are supplemented with ventilation holes. Moisture from the membrane surface drains into the drain along the lower edge of the membrane

When installing isospan along the crate, a slight sagging is allowed. A membrane without insulation is practically useless.

Application of insulating material B

This type of membrane perfectly performs the function of a vapor barrier, which protects the insulation layer from water vapor rushing up from the side of the room, and also protects the space of the rooms from the ingress of insulation particles into them.

Mount it from the side of the insulation, directed inside the room. Installation is carried out using a construction stapler on rafters or rough sheathing. Sometimes galvanized nails are used for this purpose. Correctly, when the flat side is closely adjacent to the insulation.

Work starts from the bottom. The vertical and horizontal overlap is the same as when installing other types of isospan - from 150 to 200 mm.

As in the case of Isospan Am, the joints are glued with Izospan KL, SL strapping tape. The contact points of the material with structures made of any material are sealed by using a one-sided adhesive tape isospan ML proff.

If the room is finished with clapboard, the vapor barrier is fixed using wooden strips impregnated with a septic tank 4 x 5 cm.For plasterboard sheathing - galvanized profiles

The interior trim is fixed to the wooden base with a ventilation gap of about 40 mm. In the case of using Isospan as a vapor barrier for a frame wall, it is fixed from the inside of the insulation to the loaded frame parts or to the rough sheathing.

A stapler is used as a tool, although the use of galvanized nails is also possible. It is laid on the insulation with the flat side to it. When decorating walls with plasterboard, galvanized profiles are used, clapboard - wooden counter-rails.

Izospan, as a vapor barrier for the attic floor, is placed in the gap between the ceiling finishing material - the rough ceiling. A smooth surface is turned to the latter. In this case, the ventilation gap is also mandatory.

The vapor-permeable membrane of grade B is also a good hydro-vapor barrier for interfloor floors. Installed between the ceiling trim and the draft system. The rough side is turned down. Fastened over the beams.

Between the insulation layer and the final vapor barrier layer, between the finishing floor and the vapor barrier layer, between the finishing ceiling material and the bottom layer of Isospan B, arrange a ventilation gap.

The bottom of the basement floor must be protected with a layer of steam and waterproofing. This must be done so that moisture does not penetrate from the ground to the insulation and other structural elements. The recommended isospan species for this purpose is D.

The best option for using brand D

Isospan type D for a cold pitched roof is an excellent hydro-vapor barrier. By using it, they protect the elements and structures of the attic room, made of wood, from under-roof condensation, snow, wind, atmospheric moisture.

Starting the installation of a protective barrier for a cold pitched roof, Isospan D is spread, cut out. All this is done right on the roof rafters. The advantage of the material is that it does not matter which side to attach this isospan, which is very convenient.

Horizontal sections are overlapped, traditionally starting from the bottom of the roof structure.

Conclusions and useful video on the topic

Video # 1. How to properly lay the vapor barrier in the house:

Video # 2. The sequence of work when arranging the interfloor and ceiling overlap:

Video # 3. Demonstration of the process of laying a vapor barrier film B to protect the roofing cake from household steam:

Laying hydro and vapor barriers is an extremely simple process, but the protection they provide to structures is very effective. Protection against atmospheric water and household vapors - a guarantee of a long service life of materials used in construction.

The key point when choosing a certain type of protection is the specific place and circumstances of its installation. In this regard, when purchasing material, you need to carefully study the permissible options for its use.

Tell us about how you used Izospan insulating films in arranging an attic at your own dacha or in a country house. Share useful information on the topic of the article, which may be useful to site visitors. Please leave comments, post photos, ask questions in the block below.

The IZOSPAN trademark has been present on the domestic market since 2001, the products are manufactured by the Russian company GEXA in Tver. The technical characteristics inherent in Izospan materials, 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 of 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 is construction films, membranes and tapes designed to protect fibrous insulation and wooden structures from being blown 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). You can't do without films and membranes when building a modern frame house. They are also used when installing wooden interfloor floors. Let's take a closer look at the assortment 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 covers the rafter system. The developer did not have time to lay the roofing in a warm season, but this is not a big deal. Durable 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 - racks, 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 (fluff cellulose).

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 in conditions of high humidity. As a result, their thermal insulation properties are significantly 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 release of moisture from the insulation and the wooden frame, their moisture will be minimal. Accordingly, vapor-permeable materials should be located 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 multi-layer 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 construction sites and forums, you can read, and from the lips of builders and private developers hear such terms as "Izospan waterproofing", "Izospan steam hydro-isolation" and "Izospan film". And sellers of building materials will tell you more 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 also categorically 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 characteristics of the enclosing structures deteriorate and their service life decreases. To avoid such mistakes, you need to clearly understand how 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 coating will not penetrate into the attic. But for underground structures and flat roofs, the standard Izospan B waterproofing film is not the best, it is not strong enough and weather-resistant. True, the characteristics of Izospan B, the cheapest film, are low, there are better materials that 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 of 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 the floor in a wooden house plays the role not so much of a vapor barrier as it prevents the spread of the smallest fibers of mineral wool into the premises.

The holes in vapor permeable membranes are large enough to allow water vapor to pass through, but too small for liquid water to enter. Membranes often have a rather complex multi-layer 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 to 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. We are, of course, talking about a relatively small amount and pressure of water: individual drops or a little rain. If the membrane is left unprotected by a roofing or wall covering under heavy rain, water will flow through it.

Application of vapor barrier diffusion membranes:

Ventilation of multi-layer enclosing structures and their protection from liquid water (condensate). 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.

From the diagram, the general principle of using Izospan materials is clear: from the outside - a vapor-permeable membrane, from the inside - a 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:

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 resistance to vapor permeability depend on the properties of the material and its thickness. Methods for determining and calculating the values \u200b\u200bare given in SP 50.13330.2012.

Water resistance - the water pressure that the canvas 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 the film or membrane can withstand without breaking. Measured in centimeters (H x cm).
UV stability - 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. Hexa membranes are abbreviated with 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:

IZOSPAN A is a single-layer membrane, the simplest and most inexpensive. 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 formation, but also to place it directly on the insulation without a gap. This simplifies the roof structure and saves money.

IZOSPAN AS, whose technical characteristics 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 effective, durable and expensive membrane.

Vapor barrier films

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

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 B, whose characteristics in terms of strength and durability leave much to be desired, is perfect for utility structures, interfloor floors. 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 C, 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 constructions and underfloor heating screeds.

ISOSPAN 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

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

We have only in general terms 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 the 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 to successfully build your 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, trust the design and construction of your own house only to trusted specialists.

When building an energy-intensive home, the main task is to provide effective thermal insulation. There are many types of insulation materials available to do this. But sometimes it alone is not enough to successfully solve the task. It can retain heat well inside the house in stable conditions - with moderate humidity. But when the weather outside changes - the temperature drops and the humidity rises, in this place the effectiveness of thermal insulation decreases, since without special protection, its humidity also increases. Therefore, to achieve this goal, other materials are required to protect the thermal insulation and various structures of the room from the negative effects of moisture. One of these materials is Izospan.

What is Izospan - what is it for?

Izospan is widely known today in the Russian building materials market; it is a domestic brand manufactured in the form of a membrane film and has a wide range of applications. It is an excellent means of protecting against moisture that acts both outside and inside the premises.

Izospan characteristics

Izospan is an effective protective agent against moisture of any type: water, steam, condensate, etc. It can be of different types, depending on this, some types are used to protect insulation in the roof, others are used to protect the structure of a cold roof. In addition to all this, it serves as a good waterproofing for walls, in interfloor ceilings, on basement floors - in concrete and other moisture-absorbing floors.

There are several varieties of it, each of which has its own functional affiliation.

What is Izospan

Isospan types and technical characteristics

Izospan can be divided into four large groups - A, B, C, D, each type has its own design features, which determines their functional purpose

Izospan category A

The design of this category has effective moisture-proof properties, and also allows for protection from the wind. The main task is to protect the thermal insulation layer of the house from the outside. The structure of the membrane is as follows - the surface is smooth and does not allow moisture to pass through. The inner side is porous, which allows you to effectively remove the accumulated moisture from the insulation side. The material is mounted on the outside of the insulation layer, under the roofing material, or if it is a wall, then under the facing material.

When used on a roof, according to technical recommendations, its angle of inclination should be at least 35 °. It should also be noted that its laying should take place in the absence of precipitation.

Technical characteristics of Izospan A

Composition: Propylene 100%
Water vapor permeability, not less: 3500 g / m2 / day
Water resistance not less: 330 mm water column,
Application temperature: -60 to + 80 0 С
Overall dimensions: Width 1.4 -1.6 m,
Area: 35; 70 sq.m

Izospan A - photo

Izospan category B

This type has a two-layer structure, the upper layer with a smooth surface, the lower one without roughness - it retains condensate droplets and promotes their rapid evaporation.

Izospan B protects internal building elements from water vapor emanating from the inside of the room. It is laid on the inside of the room on a heater, suitable for both walls and roofs, can be used in ceilings.

Specifications Izospan B

Composition: Propylene 100%
Resistance to vapor permeation m2 hour Pa / mg, not less: 7.0
Water resistance not less: 1000 mm water column,
Application temperature: -60 to + 80 0С
Overall dimensions: Width 1.4 -1.6 m,
Area: 35; 70 sq.m

Izospan B photo

Category C

This type allows you to effectively protect the internal structures of buildings from steam, condensate. The structure is similar to the types described above, perfect for steam and waterproofing of any type of roof, including flat. They are used to protect wooden structures in cold-type roofs (also suitable for insulated roofs).

Izospan S is also used in cement-concrete screeds in basement ceilings and in the foundations of any wet rooms.

Every modern building has a layer of insulation on the walls. For reliable protection of the heat insulator, a barrier device made of vapor barrier material is required. It ensures a long service life of mineral wool and maintains its operational properties. Today, among builders, isospan is most in demand. The characteristics of this film are optimal and the installation process is quite simple.

Izospan is used in buildings of all types to protect insulation and internal elements of walls and roofs from condensation and wind

general information

It is customary to understand this material as a set of various solutions for creating high-quality vapor barrier and effective moisture protection. This solution comes in the form:

Films.
Membranes.
A variety of ribbons.

They help to avoid wetting of wooden structures and heat insulators with a fibrous structure. They also exclude their blowing. The main area of \u200b\u200bapplication of isospan is the use as part of multilayer structures.

The choice in its favor is made for works on the construction of pitched roofs and the creation of ventilated facades.

Main varieties

Materials for creating high-quality vapor barrier on the Russian market are presented in a fairly large assortment. More than 14 types of products are produced under the Izospan brand. They are divided into four main categories:

Each type of isospan must be used for a specific type of work.

We suggest you watch a video review of the properties of Isospan A:

Specifications

In the field of private housing construction, the Izospan vapor barrier is most in demand. The characteristics of the material are impressive. Therefore, it is used as the first protective barrier when laying thermal insulation material. It is enough to competently perform the work in order to exclude the ingress of moisture into the insulation. Pure polypropylene is the main component of this product. It is completely synthetic and therefore does not absorb water.

Isospan vapor barrier film is used for thermal insulation of attic floors, ceilings, walls

During work on the insulation of buildings, its use is a prerequisite for high-quality thermal insulation of structures. It helps to improve the performance of the mineral wool interlayer. In addition to this, it ensures a long service life. The main characteristics of the material include:

Waterproof.
Excellent durability and environmental friendliness. In its composition, this solution does not contain harmful impurities.
High elasticity.
Excellent UV and wind protection.
High pressure resistant.

It also allows you to ensure stable temperature readings in the house. At the same time, it does not release the generated heat outside the room.

Advantages and disadvantages

Izospan is actively used in the construction of various buildings. Many people are attracted by the excellent vapor barrier properties of this insulation. In addition, it has and other advantages:

Reliable protection of wooden structures from decay processes.
Eliminate the formation of condensation and moisture insulation material.
Eliminates the penetration of cold air currents. A comfortable microclimate is created in the room, and the appearance of drafts is excluded.
Long service life. Many manufacturers claim that with proper installation, the material can last 50 years.
Main characteristics are preserved in the temperature range from -60 to + 80C.

Among the disadvantages of the material, one can single out its poor resistance to moisture. Certain difficulties arise during installation. It is worth learning the peculiarities of Izospan laying even before fixing the film on the surfaces so that the film performs its function.

Scope of application

Izospan can withstand power loads and not lose shape, as well as withstand the influence of ultraviolet rays

Izospan is used when carrying out work on the internal insulation of premises. It is an excellent material for insulating wall structures and internal partitions; intermediate floors and floors in rooms where high humidity conditions prevail; as a substrate for laminate or parquet; for roof insulation.

Its demand for roofing work is due to the fact that if the film is absent in the composition of the roofing cake, then the thermal insulation layer will not be able to perform its function. Under the influence of condensation, it will quickly get wet and will require replacement. Creating a vapor barrier layer from Izospan allows you to avoid this.

Installation nuances

Before performing work, you need to pay attention to the sheets of the installed insulation. There should be no gaps between them. If there are cracks, then the necessary measures should be taken to eliminate them.

For the device of a vapor barrier layer on the surface of the outer walls, it is worth using Izospan A. For interior work, Izospan B is the best solution. The first one must be laid in layers. Work must be carried out from the bottom up. It is best to use staples and a regular construction stapler to fix the film. After the completion of the work, there should be no sagging of the canvas. Otherwise, with strong gusts of wind, noise will occur on the facade walls.

For roof vapor barrier Izospan is an excellent choice. It should be cut directly on the rafters and fixed over the installed thermal insulation. The web is laid in a horizontal orientation. It is best to start placing the foil from the bottom of the roof. It is best to use nails for securing. In rare cases, you can refuse such fasteners and use self-tapping screws. Experts recommend leaving an air gap between the insulation and the laid isospan. Its size should be at least 5 cm.

When installed on a roof, the material is cut into wide strips and applied in such a way that a smooth surface remains outside

The vapor barrier should be placed in horizontal overlap strips up to 10 cm in size. At the point of contact, an assembly tape is used to glue them. This method is also suitable when Izospan is used to insulate wooden structures.

An important point when carrying out work is the correct laying of the material. It must be placed with the right side to the insulation. To avoid mistakes during installation, you should first read the manufacturer's instructions.

Which scheme is the most correct when laying Izospan largely depends on its purpose and design features.

If you need to create a vapor barrier on an inclined roof, which is devoid of insulation, then you should first install the main structure, and then lay a layer of film. Next, you need to arrange a wooden flooring.

When working in the attic, you should first place the ceiling, and then deal with the vapor barrier. After that, it is necessary to lay the insulation material and slats. Beams are placed last.

Before placing the film on the concrete floor, you first need to create a base. Then it is worth making a screed. It is on it that the film should fit. Only after the completion of this work, you can proceed to the finishing. To get a good result upon completion of the work, it is necessary to strictly follow all the recommendations of the material manufacturer. It is also worth knowing in advance about the main nuances of this procedure.

When Izospan is fixed on a wooden crate or rafters, then it is necessary to use adhesive tape or use a stapler. The film is often used for underfloor heating.

When installing insulation on the roof, be sure to protect it with a layer of vapor barrier. With its help, you can exclude the penetration of moisture into it. If polyurethane foam is used as the main heat insulator, then you can refuse to use isospan.

It is especially important to use the material in regions with harsh climatic conditions, as well as increased wind loads.

To create effective waterproofing with its help it is better to choose a membrane of a diffusion type. It provides easy steam passage, without blocking it and does not lead to an increase in humidity in the room. When installing the film, it is necessary to arrange ventilation holes of at least 50 mm between the thermal insulation and the layer of waterproofing material.

Any room must have an effective vapor barrier. In this case, the insulation will not suffer from moisture and will last longer. Izospan is the most effective solution for removing steam. The description of this product reveals its excellent vapor control performance.

The film can be used for roofing work, as well as laid during wall insulation measures. Products under the Izospan brand are offered in a wide variety. To create effective thermal insulation, Izospan insulation can be a good choice. The technical characteristics are at its best. In this respect, it is superior to other products available on the market. The work on its installation, as well as on the device of the vapor barrier layer, must be carried out competently in accordance with the manufacturer's instructions.