is a line of polypropylene nonwoven materials designed for vapor and waterproofing of 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 technology for manufacturing non-woven fabric is fully automated. But at the same time, quality control is mandatory at every stage.
Izospan has a hygienic and fire safety certificate. Also, the products have been tested for compliance building regulations and GOST standards. As a result, a GOSTSTROY certificate was issued for it. Izospan has no analogues among similar domestically produced products.
Specifications
Characteristics of isospan B,C,D,DM:
Choosing vapor barrier materials, you need to pay attention to the following parameters:
- Vapor permeability.
- Strength.
- Density.
- Water resistance.
- UV stability.
The most high vapor permeability(3000 g/m2/day) for isospan A, but it has the lowest water resistance (330 mm water column), which makes it possible to use it only on roofs with a slope angle 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/m 2 /day, respectively, but they are distinguished by their water resistance indicator - 1000 mm water column. As a result, they have become the main materials used for roof insulation.
If it is expected that the roof will remain uncoated for some period of time, it is necessary to use isospan AQ proff. It alone is UV stable for 12 months.
The best tensile load indicator for isospan D 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 tensile strength 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
- Polypropylene film with a smooth top and fleecy bottom side. Villi are necessary to retain condensing moisture and prevent it from rolling onto finishing materials. Installed in front of the insulation in the following structures:
- insulated roof;
- walls;
- floors;
- Laminated fabric with a smooth and fleecy side. Thanks to the increased density, the scope of application of this material expands. It is used:
- On unheated roofs, as moisture insulation.
- In ceilings (including above basements and attics), as a vapor barrier.
- In floor structures.
- IN concrete screed, like a water barrier.
- Polypropylene fabric laminated with film. Izospan D is widely used as:
- Additional moisture insulation on unheated roofs.
- Vapor barriers for any structures that need protection from water vapor.
- Waterproofing layer in the screed.
- Temporary roofing.
- Membranes marked A, AS, AM, AQ proff protect the insulation from getting wet, weathering and remove condensation from the roofing or wall pie into the drainage system. Benefits of use:
- Remaining moisture trapped in the insulation layer from the room is easily removed.
- Minimizes the chance of heat penetration insulating material atmospheric precipitation.
- It becomes impossible to weather the mineral wool.
- Membrane A. The polypropylene membrane has a smooth water-repellent side and a rough side that retains condensation. This type of membrane has a low coefficient of water resistance, so its main purpose is to protect the insulation on the facade.
- Izospan AS, AM, AQ proff. AS, AM are a membrane made of vapor-permeable material and a dense airtight substrate. Used for protection:
- Frame type walls.
- Ventilated facades.
- Insulated roof.
- Heat-reflecting vapor barriers FB, FD, FS, FX trap the smallest particles of moisture and radiant energy in the room. Advantages of using thermal and waterproofing reflective films:
- Heat loss through building envelopes is reduced.
- Heating costs are reduced.
- Eliminates the possibility of mold formation in damp rooms;
- Vapor barrier FB. Izospan FB is made from 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.
- Vapor barrier FD, FS. Izospan FD, FS is a polypropylene film reinforced with a metallized layer. In isospan FD, a vapor barrier film of grade D is used as the base layer, and in FS, grade B is used. Manufacturers recommend using the described vapor barrier for interior decoration:
- steam rooms;
- attic;
- as a heat-reflecting screen;
- This material- This is foamed polyethylene, backed with metallized film. Polyethylene with a layer of bubbles is an excellent heat and sound insulator, and the metallized layer prevents heat leakage and retains steam and water. Izospan FX is the most cost-effective, safe and durable vapor, noise and heat insulator. Its disadvantage is that the maximum operating temperature is + 90°C, which makes it impossible to use it in steam rooms. It is actively used as:
- Substrates for installing heated floors.
- Reflective screen for .
- Insulation on attic roofs in tandem with classic materials.
Reflective films can be used to insulate walls and ceilings only in rooms with forced ventilation, since these materials have zero vapor permeability.
Pros, cons and varieties
Heat Reflective Vapor Barrier Film
Advantages:
- Environmental Safety.
- A wide range of.
- Reasonable price.
- Reliability and durability.
- Durability to mold formation.
Flaws:
- Low durability to the fire.
- Performs its functions only when installed correctly.
According to purpose, the material is divided into three types:
- Steam and moisture insulation films.
- Moisture and windproof vapor-permeable membranes.
- Heat reflective vapor barrier films.
The first type includes vapor barrier films of grades C, B, D, which protect the insulation layer from moisture evaporating out through the enclosing structures.
Advantages of using vapor barrier film:
- Increased service life insulation.
- Reduces the likelihood of condensation formation and contamination of structures by fungus and mold.
- Eliminates the possibility of entry into the premises volatile insulation particles.
Installation
Installation diagram of isospan on an insulated roof
To lay the material you will need:
- roulette;
- hammer;
- construction stapler;
- nails;
- wooden slats;
- scotch;
Laying isospan on the roof:
- Insulation of the roof begins with fixing the vapor barrier film(B, C, D) to supporting frame or to rough sheathing.
- Secure the material with staples or galvanized nails. For additional sealing, the seams are secured with special isospan SL or KL tape.
- The panels are rolled out horizontally in the direction from bottom to top. An overlap of 15-18 mm is made between adjacent canvases.
- During installation, you need to ensure that the film adheres tightly to the insulation.
- On top of thermal insulation A, AS, AM, AQ proff.
- Izospan A is secured to the rafters with antiseptic counters nails or screws, so that a gap of 5 mm is formed. Izospan AS, AM, AQ proff, on the contrary, should fit tightly to the insulation. Therefore, it is secured to the rafters with staples or galvanized nails.
- Installation begins from the bottom of the slopes. Along the overhang of the slope, the membrane is inserted into the gutter. The canvas is rolled out horizontally, making sure that there are no distortions. It is important to secure the material tightly. Allowable sagging is no more than 2 cm. Horizontally, the canvases should overlap each other by 15 cm, and vertically by 20 cm.
- So that the condensation can evaporate, ventilation holes are provided in the ridge area and in the lower part of the roof.
- On top of the vapor barrier membrane install the sheathing.
Almost all insulation materials used in roofing today are hygroscopic. They quickly absorb water and immediately stop performing their functions. And if no insulation for the ubiquitous water vapor is thought out before them, then the matter is bad: the material itself wears out, and wooden elements roofs become rotten and become infected with fungus. Therefore, roofers always face a double task: to provide vapor barrier to the roofing pie from the inside and reliable hydro-wind protection from the outside.
But the wider the spectrum becomes over time building materials, the more complex the roofing pies are, and the more individual their protection should be, which will take into account all the features and give maximum effect. Izospan vapor barrier is rightfully considered one of these - the company has been operating for almost two decades, holds a leading position in the Russian market and pleases good choice the required products. Let's study the features of such popular films and membranes, the subtleties of their selection and installation.
The domestic brand “Izospan” began producing its products in the early 2000s. We are talking about a famous brand Russian company Hexa, which now sells its products in all CIS countries. But it is most popular, of course, in its homeland.
Which is no wonder, because the climatic conditions in Russia are such that throughout the year, with the exception of just 3-4 months, the temperature in the house is higher than outside. And this causes physical processes such as the constant upward movement of air with water molecules.
And the main task of a vapor barrier is to prevent these molecules from penetrating into the insulation. After all, if the climate of a certain region is more or less favorable, then at high outside temperatures this water naturally evaporates from the insulation and no one worries about problems with dampness or fungus. If the region has cold season years, then the water remains inside the insulation and quickly destroys it from the inside. But this is already a problem.
That's why modern choice films for arranging a roofing pie are huge, and each of them is intended for use in a specific field of construction:
Here full review all roofing films produced by Izospan:
But let us note one of the most significant disadvantages vapor barrier films Izospan: these are not suitable for roof insulation with inflatable material, as they stretch too much and form cushions. Basically, more negative reviews There is no Izospan, except for those cases when buyers simply ran into a fake, but more on that later.
Now we propose to carefully consider what roof options this manufacturer offers and for what solutions. Indeed, for each of them, the Izospan vapor barrier has its own specifications and format:
Vapor barrier for insulated roofing
We have prepared detailed illustrations and master classes for the products of this brand for you. After choosing, the second step is to find out how the Izospan vapor barrier will be attached: instructions for use always come with the product, and each type of film has its own installation features, its own overlap and even its own side of installation!
Cheap but cheerful: universal Izospan B
Izospan B is the most economical material of all offered, and it is also universal. He does his job well main function: prevent saturation of the roofing pie with water vapor.
At the same time, Izospan B can be used both for installation of insulated roofing and for vapor barrier of interfloor ceilings. It is also good because it prevents microparticles of insulation from penetrating into the room:
For double-sided use: popular Izospan S
Izospan S vapor barrier has a double-sided structure, where one side is smooth and rests directly against the insulation, and the second is rough and serves as an anti-condensation coating:
Essentially, this is the same Izospan B, only denser and more durable.
Particular strength: laminated Izospan D
Izospan D is a two-layer vapor barrier material with a laminated polypropylene one-sided coating. In essence, this is a membrane with special strength that can be used both outside and inside the roof.
Most often, Izospan D is used for waterproofing wet areas, like a kitchen, sauna, bathroom or home laundry. The installation process of Izospan D looks like this: first you need to install a continuous plank flooring on the rafters and install the membrane without any sagging (unlike films!), and then secure it firmly. It is necessary to lay such a vapor barrier on top of the insulation, or from the attic side, with the smooth side facing the roof covering.
Reinforced vapor barrier: three-layer Izospan RS and RM
Further, Izospan RS is a three-layer vapor barrier material, which is additionally reinforced with a polypropylene mesh or laminate for special strength. The rough surface of such a vapor barrier serves as the basis for retaining condensate drops.
Izospan RM is a reinforced hydro-vapor barrier with a three-layer structure, where polyethylene mesh or laminate is used as reinforcement.
Foil vapor barrier: reflective Izospan FB, FD, FS and FX
The new Izospan line is Izospan FB, FS, FD and FX, four-layer vapor barrier materials with a special effect of reflecting infrared heat radiation. They are great not only for protecting the roof from atmospheric moisture and condensation, but also from overheating attic spaces in summer. They are especially valuable when arranging an attic, because they help achieve the desired microclimate in them.
There are currently four types:
- The best seller for insulated roofing is Izospan FB - a foil vapor barrier based on kraft paper, on which metallized lavsan is applied.
- The FS vapor barrier is made of non-woven polypropylene material and covered with a metallized layer.
- Vapor barrier FD is a particularly durable material made of woven fabric on a propylene basis.
- Similar quality reflective vapor barrier FX is made of metallized film and polyethylene foam.
This vapor barrier can be used even at temperatures above 100°C! It not only serves as a reliable vapor barrier, but also reflects heat indoors. Moreover, from an environmental point of view, all four types are completely safe and have the necessary certificates:
Vapor barrier for non-insulated roof
A roofing pie without insulation also needs vapor barrier, and the vapor barrier films Izospan D and DM described above are excellent for this purpose. Such membranes should be fastened in panels across the rafters, starting from the ridge assembly. Each sheet should cover the second one, and all the insulation should ultimately form something similar to fish scales:
At this stage, you probably have a question: why are films needed in some cases, while in others the manufacturer recommends membranes? Now we will try to give you an accurate answer.
You probably know that all heat-saving materials are divided into types according to the nature of their pores, which can be closed or open. The difference is that in closed pores the air does not communicate with the atmosphere, but in open pores it does.
Therefore, if materials with open pores are used as thermal insulation, then it is enough to lay the simplest and most unpretentious vapor barrier (the same film) and to prevent the influence of wind on the other side of the insulation, use a windproof coating - vapor-permeable membranes. We are talking about special perforated film membranes that, on one side, allow water vapor to pass through, and on the other, retain water.
And even if you use a fairly weak vapor barrier on open-cell insulation, but on the other side of the insulation there is a vapor-permeable membrane, then such a design can also be considered competent and reliable. It is only important, guided by modern SNIPs, to organize natural ventilation using holes in the ridge.
But, if the roof structure of your house is quite complex, then instead of Izospan D or DM, use a new product on the market - Izospan AQ proff. This is a new vapor-permeable three-layer membrane that is considered professional. It is laid on the insulation from the street side, like a hydro-wind barrier that allows steam to pass through.
Vapor barrier for attic floors
Here are the main types of vapor barrier films that are used to insulate ceilings:
These are membranes such as Izospan A, A AS and AM. They are not only water-resistant, but also do not allow steam to pass through.
Izospan B should be laid in the attic floor with the rough side down, between the finishing materials of the floor and the sub-ceiling, or with the rough side up along the floor beams above the insulation. Be sure to leave it ventilation gap 3-5 cm and glue the junction of the vapor barrier to other surfaces with special tape:
In a standard attic structure, you can also safely use a vapor barrier from the same manufacturer, such as Izospan FD, FS or FX (we discussed them above). These are also insulating materials, but they combine the functions of vapor barrier and reflection heat flow. Such materials need to be laid between the ceiling finishing and its rough structure, with an overlap of 15 to 20 cm, or end-to-end in the case of Izospan FX.
The main thing is to put them right side: reflective surface - inside the heated room. And overlap such sheets using metallized Izospan SL tape. In this case, it is necessary to leave a gap of 4-5 cm between the interior finishing material and the reflective surface of the material. And where Izospan will adjoin the concrete or wooden surface, cover with Izospan ML proff tape.
Flat roof vapor barrier
In a traditional flat roof, a vapor barrier is placed on the base under the insulation, and its main task is to prevent any higher wet air, nor condensation:
Both Izospan D and Izospan RM are suitable for arranging a flat roof. The only difference is that Izospan D is a two-layer material, and Izospan RM is three-layer and more durable and dense. This is indispensable if mistakes were made in the construction of a flat roof and its base is not airtight.
Selection of isospan tapes for different tasks
To properly install the Izospan vapor barrier of this brand, you will need one of the special accessories from the same manufacturer. Most of these adhesive tapes are double-sided tape, which is quite simple to work with:
- Izospan SL is a vapor-waterproofing tape-sealant with a double-sided adhesive layer, which must be secured using a metal strip.
- Izospan KL is an adhesive tape that has one side with a metallized coating.
- Izospan ML proff is a single-sided super-adhesive tape that is reinforced with fiber. It differs from others in its particularly high adhesion and is used for sealing vapor barriers on absolutely any surfaces: brick, concrete, metal, foam plastic and plaster.
By the way, it is precisely at this stage of work that many are tempted to purchase the most regular tape instead of branded ones. Why not, you ask? But in fact, such tapes can withstand no more than three days of frost or heat. Here good review professional vapor barrier tapes, among which Isospanov’s take pride of place:
Now let's describe the entire process of installing a vapor barrier using these tapes step by step:
- Step 1. First you need to assemble a frame for the insulation - from timber, boards, slats and plywood.
- Step 2. Next, we cover the frame with wind protection, especially paying attention to the nodes around the pipes (if any).
- Step 3. We insert wool (mineral or stone) between the rafters, which will be held in this position due to its elasticity. In this case, the height of the wool should be 4-5 cm less than the height of the rafters.
- Step 4. After you have inserted all the insulation, foam all the cracks, dents and gaps. It is very important! Make sure that there is no possibility of cold bridges forming anywhere, and only then proceed to vapor barrier.
- Step 5. Now we spread Izospan vapor barrier sheets on the insulation. The vapor barrier film itself must be attached to the rafters without much tension, even with a sag of up to 2 cm, so that it does not tear later due to temperature changes.
- Step 6. Stick on a strip of fabric and tear off the protective layer. If you pass through a place where the integrity of the roof is compromised, for example, a window or an antenna, then you need to cut a hole and attach a vapor barrier using double-sided Izospan tape.
- Step 7. Press the second sheet of vapor barrier on top, press down and iron. If you have two strips of vapor barrier, then it is better to glue two tapes on them - for reliability. But Izospan FL metallized tape needs to be used to glue the joints of two layers of vapor barrier, right on top.
- Step 8. On the other side of the insulation, on top of the roofing cake, we stretch the hydro-wind protection directly along the rafters, and press it with counter-lattice bars.
- Step 9. We install the roof covering, maintaining an air gap between the top film and roofing covering. These ventilation ducts should be open at the window and ridge unit so that air can move freely there.
- Step 10. Close the vapor barrier inside finishing. Also if you do interior lining with horizontal lining, the vapor barrier can then be mounted vertically, and the vertical panels can be sealed with butyl rubber tapes. And don’t skimp on tape for particularly difficult areas!
During work, make sure that dust does not settle on the vapor barrier; it is better to carry out preliminary cleaning for this purpose, otherwise the isospan tape will not adhere well. And if you have worked with insulation before, you will notice that there are always a lot of small particles and fibers left from it.
And the last step - make a careful inspection so that the tape fits tightly to the vapor barrier everywhere, there is uniform tension everywhere, and in general terms the work done should look neat.
We also present to your attention an unusual master class on installing Izospan vapor barrier, where two types of adhesive tape are used at once - Izospan KL and Izospan FL (just remember that you can work with such tapes only at a temperature of +5°C):
And finally, our last advice when working with Izospan products: if we are talking about insulating an attic that is made using wooden frame, vapor barrier must be installed along the entire contour of the room: both on the roof and on the walls.
This is especially important if she has an open staircase, because then warm air from all over the house will accumulate in the attic, and it will become the warmest in the whole house. But in this case, water vapor will be drawn into the cooler lower floor (the air is always warmer in the attic), which is also not very good, although it is easier for installing a vapor barrier for the under-roof space. In this case, carefully consider the ventilation of the house, and in extreme cases, organize a separate one for the stairs. staircase with doors.
How not to run into a fake, or where do such different reviews come from?
You will be surprised how among the majority of positive reviews about Izospan there are a few that are sharply opposite. Indeed, how can the same product perform remarkably well in the construction of one house, but completely disappoint in other hands?
In fact, the problem is not only whether the vapor barrier was placed on the right side and how tightly the joints were taped. Unfortunately, it happens that a person simply stumbles upon a fake, and one such underground workshop was once discovered even in Moscow. Therefore, when purchasing, please pay attention Special attention for the following markers:
A truly high-quality product does not cost much more than conventional films, but it completely solves all problems associated with vapor barrier!
Izospan is an insulating material that ensures the preservation of the original qualities of insulation and other structural elements Houses. We will figure out how to choose the optimal type of membrane, taking into account the scope of its use, and describe the technology for installing vapor and water barrier films.
What tasks do insulating films perform?
Izospan - film or non-woven membrane, used in thermal insulation structures to protect insulation from moisture, wood and metal elements– from rotting and corrosion.
Vapor barrier membranes are necessary when installing multilayer building structures, mainly external. These are systems external insulation, pitched roofs, frame house construction, installation of wooden interfloor ceilings.
The main task of the Izospan vapor barrier is to prevent the appearance of a “dew point” in the structure. Warm air tends to leave the room, and a cold one tends to get inside. Without a well-equipped barrier, flows of different temperatures will meet in the density of the wall and condense into droplets of moisture. The result is that wet insulation freezes, thermal efficiency decreases, and mold appears inside.
Vapor barrier solves this problem - the membrane allows moist air to escape without being trapped in the thermal insulation layer. The dew point moves - condensation does not fall.
Izospan positions: characteristics and application features
The Hexa company has developed a wide range of vapor barrier membranes. Without construction experience, it is difficult to navigate the choice and determine optimal material. The main selection criterion is the purpose and scope of use. Conventionally, all types of film insulation can be divided into three categories: hydro- and wind protection, vapor and waterproofing, reflective materials to increase heat conservation.
Range of wind-waterproofing membranes
This is a hydro-wind barrier that protects insulation and structural elements from wind, condensation, and moisture from the outside. At the same time, the materials allow steam to pass through - moisture does not accumulate in the thermal insulation layer, but is ventilated into the atmosphere.
The product line is represented by the following positions:
- Izospan A. Density – 100 g/sq.m. m, vapor permeability – more than 2000 g/sq. m/day. The effect of the membrane is that moisture quickly comes out, but does not seep inside. Installation with outside heat insulator, under cladding, ventilation gap required.
- Izospan AM. Density – 90 g/sq.m. m, vapor permeability – from 800 g/sq. m/day. A three-layer membrane, installation without a ventilation gap is acceptable - air circulates in the spaces between the film layers.
- Izospan AS. Technical indicators: density – 115 g/sq.m. m, vapor permeability – 1000 g/sq. m/day. Three-layer diffuse material, more tensile resistant than AM type.
- Izospan AQ proff. Reinforced material with a density of 120 gsm. m – three-layer structure with reinforcement. The film resists mechanical damage and UV rays well. Izospan AQ is indispensable for protecting the insulation of roofs and walls if the structures will be without an external coating for some time.
- Izospan A with OZD. A membrane with fire retardant additives is recommended if work is planned to be done near the insulation. welding work.
The listed wind protection films are applicable when constructing frame walls, ventilation facades, and thermal insulation pitched roofs with an inclination of 35°.
Overview of hydro-vapor barriers
- installation of an insulated roof - suitable for flat or pitched roofs;
- waterproofing of floors - films are suitable for protecting the base, under laying laminate, for floors in a wooden house;
- hydrobarrier of attic, basement, interfloor ceilings.
Characteristics of Izospan hydro-vapor barrier:
- Izospan V. Two-layer film, density – 70 g/sq. m., water resistance – more than 1000 mm water. Art. The material is in demand due to its universal properties and affordable price. The membrane acts as a vapor barrier for indoor walls, for ceilings with interfloor and basement floors and attics under a thermally insulated roof.
- Izospan S. Density – 90 g/sq.m. m. The scope of application is similar to type B film; it can be used for concrete floors.
- Izospan D. High-strength woven material, density – 105 g/sq.m. m. Izospan D can withstand significant mechanical loads. The main purpose is waterproofing the base of the floor, flat/pitched roof, and basement floor. Suitable for use as temporary roofing.
- Izospan RS/RM. Three-layer insulation reinforced with PP mesh, density – 84/100 g/sq. m respectively. Application – arrangement of a hydro-vapor barrier for ceilings, floors, wall ceilings, roofs of any type.
During production, high-strength canvases of the D, RS, RM series are coated with water-repellent compounds. Hydrophobic films can be used as waterproofing material during installation cement screeds on concrete, arrangement of earthen floors.
Thermal reflective materials
Reflective hydro-vapor barrier with a heat-saving effect - complex films with a metallized coating. The canvases simultaneously protect the internal roof structure, insulation, ceilings and walls from wet vapors from inside the house, and also reflect thermal radiation back into the room.
Options for Izospan coatings differ from each other in composition, which determines the scope of their application.
Popular markings:
- FB – construction cardboard with lavsan coating and aluminum coating; used for cladding walls/ceilings of baths;
- FD – polypropylene fabric + metallized coating, the material is suitable for installation of water/electric heated floors;
- FS - similar in composition to FD, but here there is a double metallized film; used as a heat and vapor barrier for a sloping roof;
- FX – canvas base – foamed polyethylene + metallized lavsan film; scope of application – substrate for laminate flooring, hydro-vapor barrier for walls, attic, ceilings.
The thermal reflection coefficient of Izospan sheets reaches 90%
Izospan vapor barrier installation technology
The method of laying insulating membranes is determined by the scope of their use. Before work, you need to study the instructions and understand which side to install the vapor barrier to the insulation.
Arrangement of frame walls
WITH outside the insulation needs hydro-wind protection, and the internal one needs a vapor barrier. Therefore, for work you will need two types of membranes:
- Izospan A or alternatives: AS, AQ Profi, AM;
- Izospan B or RS.
The general diagram of a wall pie looks like this:
- External cladding.
- Cottrogrid.
- Hydro-wind barrier – Izospan A.
- Thermal insulation layer.
- Vapor barrier – Izospan V.
- Internal finishing.
Izospan A is mounted on the frame on top of the insulation, the side of placement is not important. If the brands AS, AQ Profi, AM are used, then the white side faces the heat insulator. The panels are placed from top to bottom, horizontally with an overlap of 10 cm at the joints. They are fixed to the frame with a construction stapler.
Vertical slats are attached on top of the hydro-windproofing film - the basis for external cladding. The lower edge of the membrane is fixed to the drainage drain of the base.
Instructions for use of Izospan B:
- Installation of the canvas from inside the room, on top of the insulation. Fixation to load-bearing beams frame.
- Laying order: bottom to top, overlapping horizontal canvases 15 cm.
- Izospan B is placed with the smooth side facing the heat-insulating layer, the panels are fastened with connecting tape.
- The interior decoration is mounted on a slatted frame (lining) or galvanized profiles (plasterboard) - a ventilation gap of 4-5 cm should be obtained.
Wind and moisture barrier of pitched roof
For insulated roofing pie, Izospan A is used as a wind and water barrier. If fibrous material is used for thermal insulation of the roof, it must be protected from moisture from the attic or attic. A vapor barrier of RS or B brand will cope with this task.
General insulated roof pie diagram:
- Roofing covering.
- Izospan A membrane is a barrier against wind and precipitation.
- Counterrail.
- Insulation layer.
- Vapor barrier film – Izospan B.
- Rafter system.
- Interior decoration.
The wind barrier is laid with an overlap of 15-20 cm; the film strips should run without excessive overhang or tension. The membrane is fixed to the rafters with a stapler. Near the ridge, the top strip of Izospan is mounted with a bend towards the second slope. To create a ventazor, 40 mm thick slats are stuffed on top of the film.
The internal vapor barrier (Izospan V) is laid with the smooth part facing the insulation, the rough side “looks” into the room.
Attic insulation
The choice of membranes depends on the operating conditions:
- Protection of insulation between a warm room and an unheated attic from moisture and weathering - AM, AS, AQ Profi films. Laying with the white side facing thermal insulation material, no gap is needed.
- Vapor barrier - installation from the room side. Films RS, C, DM or B are laid between the finishing and the rough ceiling with the rough side down.
Advice. It is advisable to install a ventilation gap between the vapor barrier layer and the rough ceiling - about 5 cm.
General diagram of the insulated floor structure:
- Attic floor.
- Hydro-wind barrier – Izospan brand A.
- Thermal insulator.
- Counter-lattice.
- Floor beam.
- Rough ceiling.
- Vapor barrier membrane grade B, RS.
- Ceiling finishing.
On the room side, thermally efficient insulation can be used, then the canvas is secured with the reflective layer down. In this case it is necessary gap between finishing and film barrier.
Video: how to install insulation in an insulated pitched roof
The performance characteristics of Izospan products were appreciated by ordinary consumers and professional developers. Working with the material does not require any special skills; the main thing is to follow the sequence of placement of the elements and understand how to correctly install a vapor barrier.
Today, not a single construction site can be built without vapor barrier membranes: they are used for cladding a house, laying a roof, and insulating a bathhouse. The use of films extends the life of structures and also protects them from the appearance of fungus and mold. Vapor barriers are produced by many manufacturers, but Izospan (Gexa company) has been among the leading brands for several years. Let's look at his example of how to select and correctly lay a building membrane or film.
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 turns into condensation. Indicators vary depending on the initial air humidity - for example, in most residential premises the dew point occurs at a temperature of +10 degrees.
To understand what we're talking about, imagine the room as 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 contrary, tries to penetrate inside the house. If you do not build a proper barrier that allows warm steam to escape, but does not allow icy air to penetrate inside, they will meet somewhere in the thickness of the wall and fall out as condensation. The result of such a rendezvous is usually not pleasing - wet structures freeze and become covered with mold that is difficult to remove.
Dew point offset
How does a vapor barrier film work? When using it, moist air comes out without being trapped in the insulation, the dew point moves and condensation does not fall out. Installation of a membrane is not always justified. If there is no temperature difference, then no dew point will form. But in many cases Izospan is necessary:
- when insulating external walls with mineral wool;
- in frame wall structures;
- on ventilated facades;
- on slopes and flat roofs, insulated with bulk or fibrous materials;
- in buildings where there is no constant heating (dachas, country houses);
- in rooms with high humidity.
It is better to entrust the selection of vapor barrier to a specialist. Of course have general recommendations, but in each case many factors must be taken into account. The most important of them is which side to lay the vapor barrier towards the insulation.
Technical characteristics of Izospan
Types of vapor barrier Izospan
The website 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:
- Vapor permeability is the ability of a material to allow steam to pass through. The data presented are the result of testing Izospan at the certification institute Central Research Institute of Industrial Buildings.
- Maximum tensile force – the highest value of tensile force without breaking the material, recorded during testing. Measured in longitudinal and transverse direction.
IN trademark Izospan presents all types of vapor barrier films
Waterproofing windproof vapor-permeable membranes
The materials are intended to protect the building structure and insulation from adverse factors: accumulation of condensation, as well as the entry of moisture and wind from external environment. Membranes only work in one direction, so the question of how to install a vapor barrier is very relevant.
The vapor barrier is attached with an overlap
Comparative characteristics
| View | Areas of use | Peculiarities | Vapor permeability, not less | Roll area, m2 |
| Izospan A |
| Laying the insulation on the outside - under the wall cladding | 2000 | 35,70 |
| Izospan AM |
| Three-layer membrane. Installs without ventilation gap. Maximum tensile force – 160/100 N/50 mm. | 880 | 35,70 |
| Izospan AS | Three-layer membrane. Installs without ventilation gap. Maximum tensile force – 190/110 N/50mm. | 880 | 35,70 | |
| Izospan A with OZD | ventilated facades | Used in welding or application blowtorch. Contains fire retardant additives. | 1800 | 70 |
| Izospan AQ proff |
| Three-layer reinforced waterproof membrane | 1000 | 70 |
Vapor barrier waterproof films
Internal water 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 | Vapor permeability, not less | Roll area, m2 |
| Izospan B |
| Double layer structure. The smooth side is attached to the insulation, the rough side is attached to the outside. The second side is responsible for retaining and evaporating condensate. Izospan S is also suitable for concrete floors. | 1000 | 35,70 |
| Izospan C | 1000 | 35,70 | ||
| Izospan D |
| High-strength woven material, resistant to mechanical stress. Can be used as a temporary roof. | 1000 | 35,70 |
| Izospan RS, RM |
| Three-layer insulation reinforced with polypropylene mesh. Breaking load RS – 413/168, RM – 399/172. | 1000 | 70 |
| Izospan DM |
| Woven vapor and waterproofing with high density. Protects the insulation from atmospheric influences. | 1000 | 70 |
Reflective insulation with energy-saving effect
Metallized materials not only protect the structure of the house, but also reflect infrared radiation, reducing the time it takes to warm up the room.
Reflective vapor barrier conserves heat
| View | Areas of use | Peculiarities | Vapor permeability, not less | Roll area, m2 |
| Izospan FB | saunas and baths | Kraft paper coated with lavsan. Can be used in a steam room. | Vaporproof, waterproof | 35 |
| Izospan FD |
| Polypropylene woven fabric with metallized coating. Breaking load – 800/700. | 70 | |
| Izospan FS | Polypropylene non-woven fabric backed with metallized film. Reduces heat loss. | 70 | ||
| Izospan FX |
| Foamed polyethylene, backed with metallized lavsan film. Thickness – from 2 to 5 mm. | 36 |
Important! detailed information for each type of film and membrane is presented on the official Izospan website.
Installation of vapor barrier
Work on laying films and membranes does not require special qualifications. The most important thing is to comply simple rules installation and monitor which side the vapor barrier is placed on the insulation.
General installation rules
- Before starting work, carefully study the packaging of Izospan. The manufacturer provides a detailed description of each type of vapor barrier.
- The material must fit tightly to the surface; a small edge is required in corner areas.
- Woven and non-woven fabrics are laid with an overlap (at least 15 cm).
- The vapor barrier is fastened along the perimeter with a construction stapler, and at the joints it is fixed with metallized tape.
- When installing metallized materials, the shiny side always faces the inside of the room. Films of this type are laid end to end and secured with special adhesive tape.
- Two-layer vapor barrier Izospan is attached with the smooth side to the insulation, and the rough side - inside the room. When installing floors, the scheme is reversed.
- Izospan AQ proff, AM, AS, the white side should be adjacent to the insulation.
Vapor barrier Izospan is used for interior and exterior work
Instructions for use of Izospan A
When insulating walls, type A is mounted on top of the insulation, while inner side the film should fit tightly to the thermal insulation, and the outer film should leave a small gap between the vapor barrier and the sheathing. The material is laid from bottom to top (do not forget about the overlap) and fixed with adhesive tape.
At roofing works Izospan A is rolled out over the rafters and the thermal insulation layer, installation is carried out in the direction from the bottom edge to the ridge. After the vapor barrier layer comes the sheathing. Instructions for use of Izospan AM are absolutely identical.
Important! The film should not be stretched too much, but you should not allow it to sag. In the first case, the material may tear, in the second, it may flap under high wind loads.
Instructions for use of Izospan B
Subsequence installation work as follows:
- The film is attached to the rough sheathing or rafters with the smooth side facing the insulation, the joints are sealed with metallized tape.
- Installed on top of the vapor barrier metal profiles or wooden slats (recommended size - 40*50 mm) for mounting the sheathing.
- Finishing material is sewn onto prepared slats, leaving a gap between it and the vapor barrier.
Important! When installing floors, Izospan V is laid directly on a cement or concrete screed.
Izospan is attached over the sheathing
Instructions for use of Izospan S, D
Vapor barriers S and D are used in several areas:
- On non-insulated pitched roofs the material is laid along the rafters, starting from the bottom. The overlap is at least 15 cm. Fixation with a counter-batten - required condition.
- On flat roofs the canvas is placed on the base (floor slabs or other surface). Overlap – from 20 cm.
- The film is attached to the basement floors from below using a stapler or wooden slats.
- When installing concrete floors, Izospan is also laid directly on the base.
Video instructions: installation of vapor barrier Izospan
As you can see, the range of vapor barriers is not limited to a couple of items, and each item has its own installation features. Even if you decide to attach the film yourself, consult with professionals about the selection of material. Remake roofing pie or removing siding because of one mistake will be extremely costly.
