Windproof moistureproof vapor permeable membrane
Isospan A is used to protect from the wind and condensate elements of roofs and walls during the construction of buildings of any purpose. The membrane is installed under the roof covering or the outer lining of the wall from the outside of the heater. Outside Izospan is a water repellent smooth surface. The inner side has a rough anticondensate structure, designed to delay the condensate, followed by evaporation of its droplets in the air stream. Isospane A does not allow the condensate to penetrate from the external environment into the insulation and construction, provides weathering of moisture.
When using Izospan A, the thermal protection properties of the insulation material are significantly improved, the service life of the structure is increased. Manufactured from modern polymers, Izospan A has several advantages over conventional materials:
- ease of use and high mechanical strength;
- ecological safety, absence of harmful substances in evaporation;
- long-term preservation of properties;
- high resistance to bacteria and chemicals.
Application of Izospan A materials
In the design of the insulated roof
Isospan A is used as a subterminal wind and moisture protection membrane for a device of insulated roofs with an angle of inclination of at least 35 °, covered with profiled sheets or tiles - bitumen flexible, natural, metal. The membrane is installed under the crate over the rafters with a clearance over the heater. It is designed to protect structures and insulation from the formation of under-roof condensation, additionally protects the roof and insulation from wind gusts.
Note: Isosphere A can not be used as a temporary roof!
In the walls of buildings with external insulation
If the walls of a low-rise building have a skeleton, panel or combined structure, and are lined with siding, lining or panels on the outside, Izospan A will protect them perfectly from the effects of wind and atmospheric moisture. The membrane is installed from the outside of the insulation directly under the skin.
In constructions of ventilated facades of multi-storey buildings
Izospan A is used to protect the heater in the constructions of ventilated facades of multi-storey buildings with external insulation. The material protects the heater from wind, atmospheric moisture and snow, penetrating into the ventilated gap under the outer lining, contributes to the removal of moisture from the heater.
Instruction for assembling materials Izospan A
Izospan A during the installation of the insulated roof is rolled over the heater and cut directly on the rafters (Fig.1,2). The installation is made lapped with horizontal panels, starting from the lower part of the roof, with a smooth side outward. The panels must overlap each other vertically by at least 20 cm, horizontally - not less than 15 cm. In the zone of contiguity to the roof ridge, a ventilation gap of 5-8 cm is left. The material is fixed to the rafters by counter rails, section 3х5 cm, impregnated with an antiseptic , on screws or nails. On the counter-rails, a solid board board or a roofing board is installed (depends on the type of roofing). In order that the condensate can be ventilated, ventilation gaps are provided - between the heater and the moisture-proof membrane and between the roofing and the membrane. Both gaps are 3-5 cm. It is impermissible to adhere the membrane to the heater - this reduces the waterproofing properties of the material. Membrane material is fixed in tension, with a sagging of not more than 2 cm. The lower edge should allow moisture to freely roll into the gutter. In order for the condensate and water vapor to be eroded, the under-roof space must be ventilated. To this end, in the area of the ridge and in the lower part of the roof, ventilation openings are provided, which ensure a consolidated air circulation.
Note: Isospan A should not be used as the main roofing. For temporary protection of structures during the construction period, you can use Izospan D.
When erecting walls of low-rise buildings with external insulation (Fig. 3, 4) Isospan A is mounted over the heater on a wooden frame, starting from the bottom of the wall. The membrane panels are placed horizontally, fixed with galvanized nails or a construction lap stapler, with a minimum overlap of 10 cm along the vertical and horizontal joints. Between the membrane and the outer skin of the building, counter-racks are stuffed, providing an air gap of 3-5 cm (for the thickness of the rail). It is necessary that the lower edge of the membrane ensures the drainage of moisture to the drainage basement of the building.
When using Izospan A membranes in the construction of multi-storey houses with ventilated facades, the material is placed smooth side outwards on top of the insulation from the outside of the ventilation gap. Installation is made in accordance with the type of lining and the installation system used. Of great importance is the tight fit of the material to the heater, a strong attachment to the elements of the installation system. There should be no loose areas and sagging of the material. This can lead to the appearance of acoustic "claps" under the influence of intense air movement in the ventilated gap in windy weather. The placement of the panels should be carried out in such a way as not to interfere with the external moisture penetrating the skin, to drain down naturally.
Company Stroimet offers an advantageous pricing policy for both waterproofing and vapor barrier Izospan, and for other products - ondulin, socle, vinyl siding and other materials.
Nanoisol A is a modern wind and waterproof material that is used in the construction and reconstruction of walls and roofs of buildings of any purpose. It is a membrane with different sides in the texture: the inner side is rough, and the outer side is smooth. The rough surface keeps drops of condensate before they evaporate and thereby protects the heater and other materials from moisture from the steam coming from the rooms. The outer (smooth) surface has water-repellent properties, prevents the penetration of moisture from the external environment into and other elements of the structure. Membrane Nanoisol A is mounted from the outside of the insulation, under the roofing or external wall finishing material. Its use makes it possible to improve the thermal insulation properties of the insulation and contributes to the extension of the life of the building as a whole.
The vapor-permeable wind-waterproof membrane Nanoisol A is made from modern polymers. This material has several advantages over traditional analogues:
- high reliability, tensile strength;
- ecological compatibility - the membrane does not emit harmful substances in the process of operation;
- convenience and ease of use;
- high resistance to chemical compounds and biological factors (bacteria, mold, etc.);
- long service life.
Nanoisol A can be used as a wind and waterproof material for the construction of insulated roofs with a slope of 35 ° or more. The membrane is suitable for roofs with any coating: soft roof, profiled sheets, etc. Mounting is carried out on top of the rafters over the insulation, with ventilation gap. A crate is placed on top of the membrane. In insulated roofs Nanoisol A serves to protect the thermal insulation material and load-bearing elements from wind, dirt, dust, moistening with under-roof condensate and moisture from the external environment.
When building low-rise buildings, the membrane Nanoisol A is used in the construction of walls with external insulation: of timber, frame, shield, and combined. It serves to protect materials from wind and moisture. Used for exterior insulation of walls with any external cladding:, lining, etc. Installation is carried out from the outside of the insulation, under the external wall finishing material.
Nanoisole A is used to protect the heater in the construction of ventilated facades of buildings with external insulation. Protecting the heater from the effects of cold air, wind, moisture and snow, penetrating the ventilated gap under the outer lining.
In ventilated facades:
When laying on the roof Nanoisol A is rolled horizontally over the insulation and rafters, the smooth side of the material should be facing outwards. Cut the membrane directly on the roof. Cloths are laid from the bottom to the top in an overlap. The width of overlaps on horizontal joints should be at least 15 cm, on vertical joints - 20 cm. Near the ridge between the canvases, a ventilation gap of 7-8 cm in width should be left. Fix the membrane with wooden counter-rails to the rafters, use self-tapping screws or nails as fasteners. On the counter-rails mount a solid flooring or crate (depending on the roofing used). To ensure the evaporation of the condensate between the membrane and the thermal insulation material, a ventilation gap of 2-4 cm in width is left. A ventilation gap is also provided between the roofing and the membrane for the thickness of the crate.
Experts of the company "Euromet" recommend fixing the membrane in a tensioned position. It should not sag between the rafters more than 2 cm and come into contact with the heater or other surfaces. This can lead to a deterioration of its waterproofing properties. Nanoisol A is placed so that moisture flows freely from the surface of the membrane along the lower edge into the gutter. To ensure the evaporation of condensate and the weathering of water vapor, the under-roof space is made ventilated. The circulation of air is carried out through the ventilation holes in the area of the ridge and at the bottom of the roof.
The company "Evromet" recalls that Nanoisol A is not intended for use as a roofing. For the temporary shelter of building structures, a membrane of Nanoisol D can be used.
In the construction of walls with external insulation Nanoizol A is installed between the heater and the external wall sheathing. The membrane is laid from the outer side of the insulation onto the wooden frame, with a smooth surface outward. Cloths are placed horizontally, they must overlap each other not less than 10-15 cm at the joints. The material is fixed to the frame with galvanized nails or by means of a construction stapler. Above the membrane, wooden counter-racks are fixed, which ensure the creation of an air gap 4-5 cm between it and the outer skin. The external finishing material (siding, lining, etc.) is then attached to the counter-rivets. On the lower edge of the membrane, water should flow unhindered into the drain.
The windproof membrane is a single- or multi-layer material that performs the functions of: waterproofing, non-blow coating and steam diffusion. The membrane protects the insulation from the destructive effects of wind currents, precipitation and solar radiation. In the article we will consider the types of windproof membranes, we will tell about their characteristics and application fields, and also we will give the general instruction on installation.
What is a windproof membrane for?
The windproof membrane is used to neutralize wind currents. The material performs several functions:
- Keeps lightweight insulation in place.
- It separates the cold outer zone from the inner warm zone.
- Protects the fiber insulation from blowing.
- It serves as a barrier to weathering.
- Reduces heat loss, thereby reducing heating costs.
Fields of application of windproof membranes
- Insulated roofs, attics and attic floors. The material protects the insulation during the installation of the roofing and does not allow the condensate to get inside the "pie" during the period of operation.
- Insulated walls and ventilated facades. Here, the ability to diffuse steam and hydrophobicity comes first. Drops of condensate roll down a vertical rough surface, and the properties of the membrane allow the wall to "breathe".
- Overlapping and insulated floors on the lags. Here, films that pass steam, but not water, are suitable.
- Frame partitions. Windproof membranes prevent "spraying" of mineral wool particles around the room, protect them from accumulating condensate and increase the level of airtightness of the partitions.
Types of windproof membranes
Budget options for wind protection are pergamina and polyethylene film. The disadvantage of the first is a short service life and low biostability, because of what it is used only as a temporary cover. Polyethylene delays not only the wind, but also steam. As a result, the heater accumulates condensate and collapses.
The most effective multi-layer windproof membranes. Outer shells are responsible for strength and tensile strength, and the inner part ensures diffusion of the vapor. Thanks to a special impregnation, the material can act as a temporary roof or a facade cladding.
By the type of membrane can be conditionally divided into:
- moisture-windproof membranes with a high water vapor permeability (from 3000 g / m 2 per day), but minimum water resistance (200-250 mm of water column);
- superdiffusion membranes - in addition to the vapor permeability from 1000 g / m 2 they can withstand up to 1000 mm of water column.
Moisture-windproof membranes
Moist-windproof two-layer films - the outer side is smooth and protects from splashes or powders, and the inner one, adjacent to the heater, is porous. In addition to evacuation of moisture, this film provides resistance to air pressure.Superdiffusion membranes
In regions with heavy rainfall, it is much more efficient to use superdiffusion membranes . Their three-layer structure not only ensures vapor permeability, but also protects the insulation and walls from rain and snow with insufficient tightness of the lining. The price of membranes is higher than simple polyethylene films, but in the long run the costs pay off - the service life of the insulation increases several times.
When choosing a wind protection it is necessary to pay attention to the following nuances:
- Toxicity. The material should not emit harmful fumes.
- Technical characteristics (strength, resistance to ultraviolet, temperature range).
- Lifetime.
The price of production can serve as a guide. Superdiffusion membranes are more expensive than polyethylene films, but they better cope with the tasks. There is no fundamental difference in the mounting of membranes.
Almost every building needs high-quality insulation, even if it is. This is a real axiom in the construction world. The houses must be insulated, since initially their designs are not able to withstand temperature changes and quickly freeze in the cold season.
However, it is not enough just to trim the walls with a heater. It is necessary to create a real heat-insulating pie, an important role in which is played by wind and moisture protection or simply a moisture-proof film.
We are now going to figure out what the moisture-proof film is like with the example of Izospan products. Especially the products of Isospan A and Isospan AM together with.
1 Features of the film Isospan
Izospan has been producing insulating materials for a very long time. In the market they for all time of the existence had time to prove from the best party. Therefore, as their products can not be doubted.
The main product line from this manufacturer is a special protective film. There is a film of Isospan A, Isospan B, Isospan C, etc. The difference between these materials is and it needs to pay attention.
Although it is worth noting an interesting fact, there is virtually no visual difference between the A and C films. The sizes at them too are identical.
It remains to rely on technical characteristics and the scope of the appointment. If we evaluate the isolation from its properties, the differences between different materials become obvious.
1.1 Differences between materials
So, Isospan A film - vetrovagozashchitnaya as, that is, it fulfills the functions of the heater limiter. Do not be mistaken, arguing that the windproof insulation is not needed. Just the opposite.
The wind is a very serious irritant. Unlike ordinary moisture or steam, it constantly affects the surrounding structures. And modern heaters (the same mineral wool or polystyrene) do not have sufficient density, so they are subjected to external loads.
Slowly, but surely the wind, will undermine the strength of the material until it completely destroys it.
With moisture the situation is different, but it's for sure and so everything is clear. A moisture-proof film is a real necessity. After all, waterproof insulation allows you to limit the insulation from getting water inside it.
And the water, by the way, is extremely difficult to remove from already installed insulation boards. If the constructions you have are not ventilated, then it is completely impossible. As you can see, the wind and moisture protection film performs extremely useful functions.
The membrane of the waterproof membrane Izospan B already concentrates on a few other problems. Here the main emphasis is on protecting the thermal insulation from the penetration of steam. The thickness of it, as a rule, is less, but the cost is also much lower.
Many are interested in the question of whether there is a difference between Isospan A and AM insulation. And indeed, if you look only at technical properties, then the materials seem to be identical.
However, there are certain differences. It is enough to look in the product certificate, where the full technical characteristics and purpose of the material are indicated.
Initially, the Izospan A membrane has a high density and is additionally protected from damage during installation. Therefore, the manufacturer recommends using it primarily for wall finishing. Especially for working in ventilated insulation frames.
But Izospan AM is slightly weaker in terms of strength, which forces the user to use it in places with less load. As a result, the ideal AM model is suitable for roofing.
1.2 Properties and Parameters
Now it is worth to evaluate directly the technical characteristics, as well as its interesting nuances. But first, we note that all the properties described below are such that when you use the product that you received the certificate.
A certificate of conformity is available for all Isospan products. Therefore, you are entitled at the time of purchase to demand a certificate from the seller, thereby wanting to make sure that you do not try to slip a counterfeit.
The certificate of conformity is issued by government agencies and contains information about the product, a mark of its quality, etc. Also the certificate allows to be convinced that the ingredients declared on the package in the membrane are really present.
It would seem, why such excessive caution? It's just isolation. But in fact you need to understand that insulation has not less weight in the construction than the same heater.
You can buy expensive insulation from mineral wool and finish them all the designs, hoping for a miracle. But if you do not have at least an ordinary wind-moisture-proof membrane, then in a few years serious problems may begin.
2 Production features
Vetrovagozashchitnaya membrane is made on proprietary equipment in the shops of the company Izospan. It is made of dense polypropylene. And the polymer is used mixed with a bunch of chemical components like in.
Just do not be afraid, there is nothing harmful in it. These components only contribute to strengthening the material and its durability. Thus, the Isospan membrane of the AM model because of the presence of a separate class of polymers in it has a much higher density than that of competitors' products.
But the AM model is far from the most solid example of the Isospan line.
Another important point is a two-layer film coating. Rather, she has two sides. That is, the membrane has a different coating on each side.
One side is water repellent. It is mounted outside from a heater. It is smooth and very durable, designed to protect against wind and moisture. The wind can not blow such a polymer, but the water simply flows down it, where it is removed through drainage outlets.
The second side is moisture-retaining, rough. It is her direct face to the heater. Its task is to collect condensate, because the membrane is vapor-permeable. On a rough surface, the condensate is retained and then eroded without affecting the insulation inside.
Actually, this is the unique characteristics of the Isospan film. On the one hand, it completely protects the insulation from moisture. On the other hand, it delays it, not letting it drain into the insulation.
Such a combination could win the trust of builders around the world. Better only.
2.1 Mounting procedure
Consider the order in which the membrane is laid. It is worth noting that for each design it has its own. Unlike a vapor-proof film, the wind and waterproof membrane is vapor-permeable, that is, it does not block steam.
It rather performs the functions of external isolation. A peculiar limiter and an external fence for heat insulation plates.
Accordingly, you need to mount it in a certain place.
Initially, any thermal insulation threshold consists of the following layers:
- Base;
- Steam insulation;
- Insulation;
- Waterproofing;
- Rims;
- Facial material.
It is on the site of Isospan A waterproofing and they are mounted. But here, too, it is important to note a few nuances.
For example, when decorating facades, the material is mounted directly on the heater, then covering with special slats or without fixing the carcass at all. You can do with a thorough fixation with a construction stapler.
But the roofing is already undergoing a slightly different procedure. Here, the membrane should be placed immediately under the cavity of the rafters or panels of the roofing structure. Then the skeleton or the heater itself is already laid.
3 Mounting technology
Lay the moisture barrier membrane in a simple procedure. Here it is important only to fix all the joints qualitatively and make sure that there are no holes left in the material.
Stages of work:
- Unpack the film.
- If necessary, cut.
- We perform insulation laying, starting from the lower level of the structure.
- Mount each level above the previous one, observing the overlap.
- We fix the film with a stapler.
- We glue all joints with a protective tape.
Do not save on the membrane. Try to cover each next layer with a film with a length of at least 20 cm. This will allow you to completely get rid of the possibility of leakage of structures.
Over the slats are already stuffed with a facial covering. Thus, you will be able to organize something like a vented gap, which will facilitate the evaporation of the liquid on the membrane.
However, it should be noted that in the case of working with Izospan A or AM insulation, it is not always necessary to fully observe the presence of a normally air gap. Very often without it you can do without. But it is better, of course, not to abuse such decisions, unless you live in a very dry climate.
3.1 Instruction for the use of the membrane Isosphere A (video)
After you have warmed the walls of the house, during which the inexpensive was chosen, a problem may arise that some areas of the walls are damp. In order to exclude such negative consequences, it is necessary to use a vapor-permeable membrane.
Application features
The process of warming the walls and arranging the roofing structures involves the use of such films that fit under the layer of mineral wool. If you are facing the task of warming from the inside, then it is necessary to provide a barrier to water evaporation. It is not recommended to use a material that has perforations or pores. The coefficient of vapor permeability for this layer should be minimal. It is preferable to use a polyethylene film that can be reinforced.
It is not superfluous to become a foil coating based on aluminum. Do not forget that when using a vapor barrier you need to think about the availability of a ventilation system. There are also special films on which anticondensate coating is applied. Such a vapor-permeable membrane can not form a condensate on its surface. The material is usually placed under layers that are susceptible to corrosion. Here you can include profiled sheeting and metal (the latter does not have a protective inner coating).
The film will not allow wet fumes to get to the metal. To do this, there is a rough fabric layer on the back side, which is necessary to collect moisture. Lay the film with an anticondensate coating with a tissue-side down, retreating about 2-6 cm from the layer of mineral wool. Those building membranes that can pass evaporation are used when the walls are insulated from the outside, they protect the materials from gusts of wind and can be laid in the structures of pitched roofs. Their use is also advisable in unsealed facades, when it is necessary to lay a protective layer against moisture. For permeability, the films have perforations and microscopic pores. The moisture that accumulates in the thermal insulation must pass through them into the ventilation system.
The main types of vapor permeable waterproofing membranes
The membrane is permeable to several species. It:
- material of the presolidodiffusion type;
- diffusion membrane;
- superdiffusion membrane.
The first variety is capable of passing about 300 g of vapor per day. This indicator is relevant for every square meter. If this is the case, then the coefficient of vapor permeability can vary from 300 to 1000 g / m 2. In superdiffusion membranes this index exceeds 1000 g / m 2. Due to the fact that the pre-diffusion membranes are protected from moisture, they can be used under the roof as an outer layer. It is necessary to provide an air gap between the thermal insulation and the film.
With such materials can not be used, because they do not pass steam well. After all, when it's dry enough on the street, dust can get into the pores from the ventilation. This will cause the film to cease to "breathe", and the condensate will settle on the layer of insulation.
Reviews about the vapor-permeable membrane
Membrane vapor-permeable must be stacked by special technology. If we are talking about a diffusion or superdiffusion membrane, then the pores are large enough, so they will clog up pretty soon. This necessitates the presence of an air gap for ventilation from the lower side. According to users, while not having to mess around with the installation of a lath and a counter-rack. On sale it is possible to meet not only diffusion films, but also their volumetric variety. As the buyers emphasize, the interlayer for ventilation is located inside them. Due to this, the condensate is unable to penetrate into the roof of the metal. The principle of operation of such a material is the same as that of an anticondensate film. However, there are differences. As the home wizard emphasizes, the bulk membrane is able to remove moisture from the heater. After all, if the metal roof has a slight slope in the range of 3 to 15 °, then the condensate from the lower side can not flow down. He will undermine the galvanized coating and gradually completely destroy it.
How to install the membrane - on the inside or outside of the heater?
The vapor-permeable waterproofing membrane must necessarily be laid down by a certain technique. If it is necessary to heat-insulate the facade, then the vapor discharge film must be located on the outside. Whereas if it is necessary to insulate the roof, then a film with an anticondensate coating of bulk or diffusion type is laid on top of mineral wool. In this case, it is necessary to follow the technology, which is used in the arrangement of ventilated facades. If the roof does not have a heater, then the film layer should be at the bottom, under the rafters. In case of thermal insulation of the upper ceiling of rooms under the attic, the vapor-permeable membrane must be laid from the bottom of the heater. The vapor-permeable should be used for internal insulation of walls. In this case, it should not have a perforation, and lay it on top of the mineral wool, inside the room.
How to lay the membrane - the wrong side or face?
As practice shows, for many people it remains a mystery which side to lay the vapor-permeable membrane. If the film has the same back and front, then the question is immediately removed. However, it is not always possible to find two-sided films on sale. If we are talking about an anti-condensate variety, then there will be a fabric side from the inside, and at the installation it should be turned into the interior of the room. It is also necessary to turn the metal coating on the foil membrane.
If a diffusion membrane has been purchased vapor permeable, then you should familiarize yourself with the instructions. In it, the manufacturer usually indicates the technology of laying the material. However, one and the same company can produce single-sided and double-sided films. Determine the outer and inner sides can be by color. If the membrane has two sides, then one of them is painted in a brighter shade, usually the outer side of the material.
How to choose a membrane
If you need a wind-moisture-proof vapor permeable membrane, then you can pay attention to the most often purchased by the buyers option "Izospan A", which is designed for laying in the under-roof space. It is used to protect against condensation and wind elements of walls and roof during the construction of the building. The membrane should be located under the roofing or wall lining on the outside of the thermal insulation. The outer side is a water repellent smooth surface, while the inner side has a rough anticondensate structure. It is designed to delay moisture and subsequent evaporation in the air stream. This windproof vapor permeable membrane is easy to use, it is characterized by high mechanical strength and environmental safety. In evaporation there are no harmful substances, and the properties of the material can be preserved for a long time. The material is resistant to bacteria and chemicals.
Peculiarities of laying the material "Izospan A"
The vapor-permeable membrane "Izospan A" is used as a windproof membrane for the arrangement of insulated roofs, the angle of which must not be less than 35 °. As an external coating, profiled sheets or bituminous shingles can be made.
Features of the membrane "Megaflex"
Do you need a vapor permeable membrane? Which is better, you need to decide before you go shopping. One of the types of such materials is "Megaflex", which is a three-layer structure. Two outer layers are microperforated, and the inner layer is a reinforced film. give the material strength, while double-sided lamination provides waterproofing properties.
The material has micro perforation, which guarantees the ventilation of water vapors coming from the interior. This moisture-proof vapor-permeable membrane is able to protect the under-roof space from humidity, dust and soot, to protect the materials from external moisture and internal condensate. If wind protection is necessary, then a version of "Megaflex D 110 Standard" should be used, which is rolled out with horizontal overlaps with an overlap of 15 cm.
Conclusion
A hydro-windproof vapor permeable membrane that protects materials from moisture, wind and vapors must be present in insulated roofs and ventilated facades. In the first case, the gap is arranged by the method of constructing a counter-grating, whereas in the case of facade insulation, the gap can be obtained by installing horizontal profiles or racks.