During construction modern house, you need to pay attention to the sequence of steam and waterproofing of the roof, which in turn saves energy and protects rafter system with insulation against moisture, throughout the entire life of the house. The main waterproofing materials for roofing, tested in practice, are roofing films: Fibrotek RS-2, Yutavek 115, Tyvek Soft and Delta. Such roofing films can and should be given preference. Based on experience, I would like to offer only the best waterproofing, vapor barrier and windproof membranes.
Many builders do not even know that when installing or installing façade design For example, for siding, two films are always used. This is a roof waterproofing that removes excess moisture from the ventilation space and a vapor barrier that reflects heat from inside your home. Steam and waterproofing for roofing is a standard that is established throughout the world and is also used in the climatic zones of Russia. Complex designs roofs, for example soft roofing, always require the presence of a competent roofing pie with a lower and upper membrane. Roofing films have different prices, depending on the area of application. Cold roofing requires inexpensive films, but if you are insulating the roof, be sure to use a vapor barrier from the inside of the room, preferably with an aluminum layer, and use diffusion membranes along the top of the rafter system as waterproofing. In this way you will create a long-term, organized microclimate in the under-roof space of your building.
The main purpose of waterproofing is to let air through (breathe) and keep moisture out. As a rule, it is installed under the roof for ventilation of the under-roof pie. Vapor barrier - used to retain warm air in the house (reflects heat).
Using correct installation films, you keep the insulation dry, and the rafter system lasts much longer. Often waterproofing for the roof saves from heavy slanting rain, snow, drops of water still fall under the roof and simply flow into the gutter along the membrane.
Most reliable option, when the insulation is laid with a thickness of 100 mm, 150 mm, this leaves a ventilation gap of 50 mm between the insulation and the waterproofing. In this case, we recommend installing a waterproofing diffusion membrane with micro-perforation from the premium series, such as: Fibrotek RS2 PROF, TYVEK Soft, or YUTAVEK 115, which can also be laid with 200 mm insulation, without a ventilation gap. A film of this class perfectly ventilates the roof pie and provides good air exchange. As for facade insulation, for example, log siding, be sure to create a ventilation gap! You cannot fix siding directly to the film. Firstly, you will make a hole in it, and secondly, there will be no necessary ventilation. If you do not insulate the roof and walls, then you can install an inexpensive, economy-class reinforced waterproofing film such as: YUTAFOL D 96 Silver, Yutafol D110.
Do not install cheap film together with insulation to avoid condensation, stains on the ceiling and expensive repairs!!! Today there is a very wide variety of hydro-vapor barriers and everyone wants to build their own house from QUALITY materials. Products costing less than one and a half thousand rubles will quickly fail - these materials do not perform their functions!!! For this money, you are likely to get only beautiful packaging. Buy roofing films only in specialized stores.
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Yutafol D 96 Silver is waterproofing and is a two-layer laminated perforated polypropylene film, has dimensions of 1.5 x 50 m and a density of 96 g/m 2. Manufacturer: Czech Republic roll 75m2 | 1395 RUR/piece |
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Yutafol N 110 Standard this is a vapor barrier that consists of three layers: a very durable perforated mesh, which is laminated on both sides with a vapor barrier polyethylene film, has dimensions of 1.5 x 50 m and a density of 110 g/m 2. Manufacturer: Czech Republic roll 75m2 | 2300 RUR/piece |
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Yutafol D 110 Standard This waterproofing film, which consists of three layers: a reinforced mesh made of polyethylene strips and perforated polyethylene on both sides. The film has dimensions of 1.5 x 50 m and a density of 110 g/m 2. Manufacturer: Czech Republic roll 75m2 | 2300 RUR/piece |
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Fibrotek RS-2 Prof superdiffusion four-layer polypropylene membrane. Provides waterproofing and wind protection of insulation in roofing and wall structures. The high vapor permeability of the material does not prevent the release of water vapor, preventing the formation of condensation. Film 50 x 1.5 m, density 105 g/m2. Manufacturer: Russia roll 75m2. | 3600 RUR/piece SALE |
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Yutavek 115 is a three-layer polypropylene waterproofing, super-diffusion roof membrane Yutavek 115 is used to protect roofs and walls. It has excellent strength, which provides high-quality waterproofing ability. Yutavek 115 has dimensions of 1.5 x 50 m and a density of 115 g/m 2. Manufacturer: Czech Republic roll 75m2 | 4450 RUR/piece |
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Tyvek Soft is a single-layer non-woven high-strength polyethylene. Tyvek Soft waterproofing is resistant to atmospheric influences and has high vapor permeability. It has a wide temperature range of application and high resistance to tearing. Film 50 x 1.5 m and density 58 g/m2. Manufacturer: Luxenburg roll 75m2 | 5100 RUR/piece |
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Yutafol N AL170 is a four-layer reinforced polyethylene vapor barrier film for roofing and walls with a reflective aluminum layer. Its use prevents the penetration of steam into the wall structure, and the reflective ability (more than 95%) of the aluminum layer reduces heat loss. Size 50 x 1.5 m and density 170 g/m2. Manufacturer: Czech Republic roll 75m2 | 5450 RUR/piece |
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Tyvek Solid single-layer waterproofing non-woven polyethylene. Highly weather-resistant and, if necessary, laid directly on the insulation. Possesses wide range temperatures for use. Unlike Soft, Solid film has increased strength characteristics. Film 50 x 1.5 m and density 82g/m2. Manufacturer: Luxenburg roll 75m2 | 6550 RUR/piece |
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Tyvek DuPont Airguard SD5 is a two-layer film made of high strength non-woven polypropylene. Used as a vapor barrier highest category, which evenly removes from the room excess moisture without the risk of condensation. Airguard fibers control comfortable temperature and room humidity. Film 50 x 1.5 m and density 108 g/m 2. Manufacturer: Luxenburg roll 75m2 | 8400 RUR/piece |
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Delta-vent n is a three-layer polypropylene waterproofing, super-diffusion membrane, which is used for ventilated roofs and facades. Copes well with excess moisture and condensation. Delta vent N premium film. | 5270 RUR/piece |
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Scotch SP-1 is a special double-sided adhesive tape for hydro and vapor barrier. It is used for hermetic connection of hydro- and vapor barrier films, as well as for organizing hermetic connections to wooden and metal structures roofs. Roll 25 meters. Width 20mm. | 500 RUR/piece |
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Delta-multi-band m60 is a very strong one-sided tape for gluing joints of waterproofing and vapor barrier overlaps. It has an excellent adhesive base and is often used in the repair of roofing films. Roll 25 meters. Width 60mm. | 1100 RUR/piece |
The vapor barrier layer is one of essential elements roofing pie. It is necessary to protect thermal insulation layer and rafter system from excess water vapor. Steam from interior spaces the house always rises upward, passing through the insulation, it will cool down and settle there with condensation, and this in turn will lead to a decrease in the properties of the thermal insulation layer and swelling/rotting of beams and ceilings. But this will only happen if there is no vapor barrier film.
The line includes hydro- and vapor barrier films and superdiffusion membranes. Grand Line H98 film has a number of advantages - the laying pattern, installation side, and overlap boundaries are indicated on the roll. Made from primary raw materials.
Folder products offer several types of material:
The Tyvek line includes two vapor barrier membranes:
Insulation from Icopal Fel"X- this is a material consisting of three layers - polypropylene, SBS-modified bitumen and a non-woven base. These layers provide strength, waterproofing and protection to the roofing pie.
The assortment includes several products:
One of economical materials. The line includes Optima B - vapor barrier, Optima C - provides vapor and waterproofing, and Optima D - a universal hydro- and vapor barrier material with increased strength.
A three-layer membrane has high vapor permeability, quickly removes moisture and protects the insulation.
It is a fabric with the addition of a UV stabilizer and a protective layer.
Vapor barriers can be installed on different surfaces.
For example, for the floor. In this case, the material is placed inside out against the floor beams.
Vice versa for the ceiling. The film is unrolled and installed with the rough side inward.
Can be installed on walls. In this case, the following rules apply:
When installing a vapor barrier on wooden structures, the tree must first be treated with an antiseptic.
Important! Installation should not be carried out in damp or rainy weather. The vapor barrier material must be dry.
Most often, the manufacturer provides instructions for proper installation along with the material, and these instructions should be used. Rolls should be stored on pallets at a distance from heating devices, indoors or under cover. No more than 25 rolls can be stored on one pallet. Rolls are also transported on pallets in closed vehicles.
You can see more details about the installation of vapor barrier materials in the following video.
In conclusion, it must be said that vapor barrier is one of the most important elements for creating a roofing cake. From quality and correct installation The service life of the insulation and the entire roof as a whole depends.
Modern roofing technologies are very different from the methods of covering residential and commercial buildings a century ago. More advanced and durable roofing materials retain heat better, protect more reliably from moisture penetration and make housing more comfortable to live in. However, complete tightness also has back side – « Greenhouse effect» and the resulting condensation that settles inside the roof structure. To protect the frame and insulation from destruction as a result of getting wet, a vapor barrier is performed on the roof. In this article we will tell you what vapor barrier materials exist, how they differ and how they are used in roofing pie.
Roof vapor barrier is an essential component of the roofing pie, on which the service life and safety of the finishing coating depend. It is a thin fabric or film, the structure of which allows air to pass through, but blocks larger water molecules. Vapor barrier materials are used as part of a “warm” roof, since it is more prone to condensation due to heating of the under-roof space. Vapor barrier performs the following tasks:
Note! Most modern roofing coatings require the installation of a vapor barrier, which provides protection against condensation and wetting. Only if this condition is met will the waterproofing material last the service life declared by the manufacturer.
Vapor barrier materials are an essential component of the roofing pie of a “warm” roof; they are attached to inner surface rafters with a construction stapler or adhesive. The material is cut into strips, which are overlapped so that condensation cannot penetrate through the joints. For effective vapor barrier operation you need:
Important! Water vapor barrier is a material that combines the properties of waterproofing and vapor barrier coatings, that is, it does not allow water or steam to pass through, while remaining breathable.
During construction own home Non-professionals often wonder which hydro-vapor barrier is better, and how to choose the material suitable for a particular structure. Experienced craftsmen It is recommended to follow the recommendations of the roofing manufacturer, and also take into account the following criteria:
Please note that the use of roofing felt, roofing felt or waterproofing material as a vapor barrier in combination with modern roofing materials is not allowed, since they do not allow air to pass through. Despite affordable price and high strength, they do not protect the frame structure from condensation, but rather stimulate its active formation.
Modern vapor barriers for roofs are high-tech polymer membranes, the multilayer structure of which effectively protects against the penetration of water and steam, but at the same time allows air to pass through, which is necessary for ventilating the rafter frame. IN roofing works The following vapor barrier materials are used:
Important! Vapor barrier materials have 2 sides, one of which allows steam or water to pass through, and the other does not. Therefore, during installation it is important to properly fasten the sheet, otherwise the operation of the roofing pie will be disrupted.
Steam and waterproofing is a whole complex finishing works, aimed at increasing the hydrophobicity of the protected surface, while maintaining the vapor permeability of the isolated environment.
Moreover, this technology is in demand only in the case of arranging a protective layer for a wall or roofing insulation. Otherwise, the simultaneous use of steam and waterproofing is simply not in demand. After all, for protection ordinary surfaces It is enough to use only waterproofing.
Therefore, in this article we will describe the process of steam and waterproofing, both inclined and horizontal, and vertical surfaces, simultaneously compiling an overview of the materials used within this technology.
Let’s clarify right away: waterproofing and vapor barrier are two completely different technologies. Waterproofing solves external problems by protecting the insulation from “external” moisture - rain, snow, fog. Vapor barrier is focused on solving “internal” problems. It protects the insulation from “internal” moisture - water vapor that has leaked through attic floor or a wall.
In short, the main difference between waterproofing and vapor barrier is the positioning of the protective layer. For waterproofing it is located on the outside, and for vapor barrier it is located on the reverse side.
In addition, vapor barrier can only guarantee “solid” protection, which does not give a chance to “break through” to the insulation. And waterproofing can cut off moisture and allow air to pass through. However, not all waterproofing materials are vapor permeable. After all, such insulation costs much more than the conventional option.
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Waterproofing coatings are laid on top of the heat insulator, on a special sheathing. The main task of such a coating is to cut off moisture from the insulation that has seeped through the roofing or facing material.
In addition, the waterproofing material also protects the insulation from condensation accumulated on the inner surface of the roofing or facing material. At the same time, vapor-permeable waterproofing for universal purposes is capable of transmitting air, being impermeable only to moisture. This quality of waterproofing membranes facilitates the process of ventilation of the attic space.
The task of vapor barrier is slightly different. With its help, an impenetrable barrier is formed that cuts off the insulation from load-bearing wall or roof frame. That is, the vapor barrier is laid directly on the wall or roofing board, and the sheathing and insulation layer are installed on it.
Waterproofing and a vapor barrier that protects the insulation from moisture are formed on the basis of membrane or monolithic roll materials.
A good example of such a product is Izospan vapor and waterproofing - in the range of this trademark You can find five types of steam and waterproofing insulators. Therefore, we will consider typical varieties of such materials using the example of products of the Izospan brand.
The series of vapor barriers and waterproofers from Izospan consists of the following types of membranes and roll coatings:
As you can see, there are a lot of options. And you can choose the ideal vapor and waterproofing agent for any installation scheme for insulation protection. All that remains is to figure out the installation technologies.
Steam and waterproofing are used to solve various problems. The first protects the material from “room” moisture, and the second from precipitation. And differences in functionality left their mark on the installation process of these materials. Therefore, we will have to consider vapor barrier technology separately from the waterproofing process.
The vapor barrier is installed as follows:
The last point is very important. Without ventilation, a vapor barrier will only harm the house, causing mold and mildew to appear.
To waterproof the insulation you will have to do the following:
To conclude our review of the waterproofing process, let us give you some tips:
Waterproofing roofs or walls is still a relatively simple task. But arranging steam and water protection for windows is a completely different task, which can only be solved with the help of special technology.
Well, the process of steam and waterproofing windows is as follows:
As a result, the window is protected by as many as three insulators - elastic material under the casing, a waterproofing film and polyurethane foam. And such a sandwich leaves no chance for moisture!
What kind of roof waterproofing will be the best option? Who doesn't want to live in the same comfortable conditions in the summer heat and winter cold. Obviously, it can help cope with the cold and save on heating costs proper insulation. But the problem is, such an excellent insulation as mineral wool loses its quality when wet.
Protect mineral wool thermal insulation materials water vapor barrier can protect the roof from moisture. Of course, the roofing material itself does a fairly good job of preventing precipitation from directly getting inside onto the insulation, which cannot be said about the condensation formed under the roof. In this case, you will need a high-quality hydro-vapor barrier, which will protect the insulation from water vapor rising upward from the living quarters.
In front of the device new roof you need to choose the right hydro- and vapor barrier films so as not to encounter various unpleasant surprises in the future, for example, stains on the surface of the attic ceiling in the absence of any defects in the roofing. That is why, first of all, it is necessary to clarify what waterproofing and vapor barrier are, what functions these insulating materials perform.
If there is no waterproofing of the roof from the inside, steam will directly enter the thermal insulation layer, “clogging” the air pores in it, and this will sharply reduce the properties of the insulation. This process is especially active in winter, when water vapor settled in the pores of the thermal insulation quickly crystallizes. That is why the thermal insulation layer needs protection from moisture coming from outside. This is exactly where film waterproofing material will functionally help.
On a note
The main difference between roof hydro-vapor barrier is the way modern waterproofing membranes function: they only allow steam to pass out from the thermal insulation layer, preventing water from penetrating from the outside.
Water vapor always diffuses towards cold air. The barrier that will first encounter steam on its way to the insulation layer will be the vapor barrier. Of course, it is difficult to expect that no part of the steam will nevertheless leak through the vapor barrier into the insulation. However, thanks to the vapor permeability of the waterproofing, steam will freely escape from it, after which it will go outside, picked up by ventilation flows.
External differences between these insulating films related to the structure of both materials. Let's look at each of them separately.
Both sides of the vapor barrier are completely waterproof, which cannot be said about waterproofing. The film practically does not allow particles of steam and water to pass through either into the insulation or into the premises. The cheapest option for this type of material can be considered ordinary polyethylene. But it is not recommended to use polyethylene in the roofing “pie”. This is due to the fact that under the roof, especially in the summer heat, the film becomes very hot and begins to stretch, and may even become damaged. And since the roof should last one or two years, the best option would be a multilayer material with a reinforcing polymer frame that will prevent the film from being pulled out.
Roof mansard type film with a foil side. Price of roof waterproofing in in this case higher, and it will cost more than using a vapor barrier material. But this not only creates a reliable vapor-tight barrier, but it also helps retain heat. The foil side, which, according to the installation instructions, must be turned toward the inside of the room, reflects infrared radiation, and with it, as you know, the lion’s share of heat leaves the living quarters.
According to the instructions for using hydrovapor barrier, such vapor barrier allows you to solve several problems at once, in particular:
When purchasing, you should make sure that the selected material is a vapor barrier - there should be a corresponding mark on the packaging.
Out of ignorance, many people assume that since vapor barrier is waterproof, it can replace waterproofing and even that it will work better. This misconception, which is fraught with unpredictable consequences, will result in additional costs, since each of these films serves a specific purpose.
The waterproofing layer mainly serves for:
It was already noted above that there are no absolutely vapor-proof films: although in an insignificant amount, vapor still enters the insulation through the vapor barrier. Therefore, it must be taken outside. Waterproofing films and membranes are suitable for this.
They have a lot useful qualities:
And yet the most important property A waterproofing membrane is considered to have a porous structure. Funnel-shaped pores facilitate the smooth removal of residual steam from the thermal insulation. The pores with their wide part at correct installation should be directed towards the insulation, and the narrow one should be directed outwards. Thus, steam escapes through the wide one, and the narrow one does not allow moisture from the outside to penetrate into the pores, since the water molecule is larger in volume than that of the steam molecules.
When laying a waterproofing membrane, it is extremely important to correctly determine the side of installation towards the insulation.
There are diffusion and superdiffusion. Structurally, they differ in the number of pores.
When installing roofs made of metal tiles and other roofing materials, on the back side of which condensation accumulates, anti-condensation films are used. In this case, the waterproofing film does not “release” steam from the heat-insulating layer. Instead, it accumulates steam, thanks to the huge number of tiny fibers that are located on the back of the insulation. From there, moisture leaves with the flow of ventilated air through the ventilation gap.
The choice of water vapor barrier is based on its characteristics. As an example, let's look at the modifications of the popular vapor barrier Izospan today, more precisely, A, B, C, D and FB.
On a note
Waterproofing materials of this type are laid with the water-repellent (smooth) side facing out. The rough side that allows steam to pass through from the thermal insulation should face inward. Pay attention to the inscription on the film - when laying it, it should be on top.
