The fact that insulation moistened with condensation loses its ability to retain heat by almost half is known to any specialist in the construction industry. This problem is especially relevant for the under-roof space. In order to eliminate this negative factor, it is necessary anti-condensation film... It provides the necessary protection of the insulation against moisture penetration. And today this task is one of the most important in the construction of new houses or renovation of old ones. That's why anti-condensation waterproofing films are one of the most demanded products in the world construction market.

What is an anti-condensation film?

Roofing anti-condensation waterproofing film is a product made of polypropylene, on one side of which non-woven textiles are applied. Its presence is quite justified, since the pile of textiles has the property of retaining moisture, and its weight can be several times greater than the weight of the film itself.

Polypropylene from which they are made anti-condensation films for metal tiles, is an effective barrier to moisture. It does not allow air to pass through, thereby preventing snow and rain from blowing from the outside. In addition, it has other characteristics that make it possible to make any roof more functional, namely:

• immune to ultraviolet radiation;
• does not let heat out;
• has excellent strength characteristics;
• easy to install.

Application features

Anti-condensation films - the best option for those cases in which diffuse membranes are not able to provide the necessary protection of the insulation from negative impact condensate and cannot provide the desired moisture removal. They are ideal for the following situations:

• arrangement and repair of the attic;
• installation of roofs with finishing from euro slate, metal tiles, corrugated board;
• arrangement of non-insulated under-roof space;
• installation of roofs over rooms with elevated level humidity.

In addition, do not forget that given view material is able to remove moisture well from the premises where the finishing work was carried out using the "wet" technology. Due to their immunity to ultraviolet radiation, anti-condensation films can provide temporary protection for the thermal insulation layer at that stage of roof construction, when the finish has not yet been installed.

In general and in general, the presence of an anti-condensation film can extend the life of a metal-tile roof by more than 50%.

Anti-condensation film, Full waterproofing with a roofing anti-condensation film under the metal tile

Roofing anti-condensation waterproofing film is a product made of polypropylene, on one side of which non-woven textiles are applied.

What are anti-condensation membranes

Anti-condensation membranes (films) are coatings made of waterproof spraying and polypropylene fabric (used as an absorbent layer) that do not allow steam to pass through. This combination absorbs steam and transports it outside the roofing material. The film is capable of trapping condensation that forms on inside roof and protects supporting structure... The pile after installation of the film can retain condensate weighing 3-6 times its own.

The upper layer is responsible for the water-repellent properties of the material, and the absorbent capabilities of the adsorbent layer eliminate the passage of water vapor. This ensures insulation of the insulation and prevents the ingress of condensate from the surface of the membrane into parts. rafter system.

Where are anti-condensation films used?

The main field of application of membranes is pitched metal roofs, namely: metal tiles, folded roofing. They most need reliable protection from corrosion. Due to the low quality of the material, violation of technology, exposure to temperature, microcracks may appear as a result of expansion or contraction of the metal during daily temperature fluctuations. The presence of condensation on the inside of the material leads to the formation of rust. The use of an anti-condensation membrane is a way to eliminate the above-described problems, since the adsorbent layer effectively absorbs steam and condensate.

Anti-condensation films with a hydrophobic coating are used where diffusion membranes cannot cope with protecting the roof from condensation and removing excess moisture. Anti-condensation products are perfect for insulating insulation, repairing attics, installing roofs covered with metal tiles, galvanized sheets, ondulin or corrugated board. In the roof, in which there is no insulation, anti-condensation films prevent the ingress of dust and soot.

Films function well in roofs that are located above objects with increased circulation of moist air, and UV resistance allows you to lay membranes as temporary protection for rafters and insulation in the absence of finishing materials... A metal tile, under which there is an anti-condensation film, is operated 50-70% longer than a roof that is not protected by a membrane.

Benefits of anti-condensation film

• high mechanical strength;
• unlike roofing material and glassine does not emit harmful substances when heated, has no smell;
• films are environmentally friendly, do not interact with acids and alkalis;
• retains its properties throughout the entire period of operation, does not break and does not collapse under the influence of the environment;
• thanks to UV stabilizers, the membranes can be safely operated in the open sun;
• due to their low weight, the films do not load the rafter system, are easily and quickly installed, and have reasonable prices.

Resistance to impact ultraviolet radiation, elimination of heat loss, resistance to stretching during installation are the main advantages of anti-condensation films.

Features of membrane installation

Anti-condensation films are installed between the insulation and the trim or roofing material. The pile side of the membrane perfectly absorbs moisture and prevents it from getting onto the inner surface of the roof. During installation, it is necessary to provide for powerful ventilation of the under-roof space for the unhindered release of moisture. For this purpose, a ventilation gap is made in the rafter system.

Membranes are installed only in dry weather after installing the rafter system and laying the insulation. The film is laid out evenly, without folds, with an absorbing surface down on the rafters, and the lower one should not come into contact with the heat-insulating material. It is laid out only with an overlap and horizontal stripes from the eaves to the ridge of the roof.

Fastened with construction stapler or galvanized nails with a large head. The overlap of the strips vertically should be 20 cm, and horizontally - at least 15 cm. The membrane joints are laid on the rafters and fastened together with mounting tape. The distance between the anti-condensation film and the insulation should be 40-60 mm, along the lower edge of the membrane, moisture will drain into the water drainage chute.

After installation, the cover is fastened with 3 × 5 cm strips and nailed with galvanized nails from above along the rafters. A crate is made on top of the slats. After completion of installation, moisture should be excluded from the insulation. Fitting points of the anti-condensation membrane with stove and chimney flues, antenna stands and ventilation ducts should be further insulated.

Ondutis is a popular manufacturer of anti-condensation films

Ondutis anti-condensation membranes are very popular, namely: R70, which protects the insulation from steam and condensation, and R70 Smart - comes complete with mounting tapes for gluing.

Conclusion

When choosing a film, you need to pay attention to its vapor permeability: it should be close to zero (0.25-0.35 g / m2 h * Pa), in order for the membrane to maximally protect the roof from condensation and subsequent corrosion.

Anti-condensation membranes (films): What is it

What are anti-condensation membranes or films? We will figure it out in this article from construction experts.

Roof waterproofing film

Roofing films - the possibility of excellent vapor and waterproofing!

Roofing anti-condensation films: main characteristics

Each of us, having a house or a cottage, is interested so that condensation does not form under the roof of the home and the structure can serve as long as possible. After all, what causes condensation? It appears due to temperature differences on the lower plane of metal sheets.

In addition, the vapors rising from the inner rooms of the building, in the cool air, the spaces under the roof turn into water. And this is already fraught with wetting of the insulation, which means that it will lose its heat engineering features. It is also a direct road to the freezing of the roof and the appearance of ice on it, rotting of the crate and rafters, an increase in mold and spoilage. interior walls and the ceilings of the house.

So that there are no such unforeseen situations, it is better to take care of the insulation of the required thickness and its protection from the side of the metal tile in advance - a properly selected roofing film will help 100% avoid problems with the roof!

Steam and waterproofing - what types of films are capable of providing them? It should be noted that the hydro- and vapor barrier film can be: single-layer and consist of several layers, with or without adhesive tape ... That is, roofing films can always be chosen for every taste, at any cost and taking into account all the nuances of the correct organization of the space under the roof ( i.e., a high-quality film should be waterproof and airtight, vapor-permeable, durable, and so on).

So a waterproofing film of any type is designed to prevent moisture from seeping from the outside and at the same time should help to remove a certain amount of insulation steam outside (due to microperforation).

Installation of films without fail is done with a sag of 20 mm (above the insulation).

As for vapor barrier films, then they are needed to protect the insulation from steam. In this case, a tight connection must be present!

Roofing anti-condensation films: the most common of them

Tyvek® Soft membrane

One-layer material with which vapor barrier is easily achieved. It is an excellent protection for a pitched roof with a ventilated gap (even a mansard roof) from all winds and precipitation. Used for work and living quarters.

Waterproofing film of one-layer type with increased strength and anti-reflective coating. Perfectly protects stingrays even mansard roofs+ walls of houses from winds and precipitation.

Its installation is carried out directly on thermal insulation material and rafters without ventilation gap.

Tyvek® Supro Membrane

An excellent material when waterproofing is required and the highest strength with vapor permeability. In addition, the film does an excellent job with wind protection of slopes of any variation (warm, cold or combined roofs). It is successfully used in floor structures and wall structures.

A film with a pronounced waterproofing property. It has an extremely strong adhesive tape and is endowed with a vapor barrier.

Most the best way to protect the roof space and walls of the building from all weather conditions. It is used in all types of roofs, both with load-bearing structures and without them.

Tyvek® Housewrap

This underlay film can be applied directly to the thermal insulation. It is a durable, lightweight, flexible, windproof, single layer material with waterproofing properties. It is good in that it increases the tightness of the structure, can be fixed on a frame rack, plywood sheathing, block masonry.

Ideal for wood and steel frames, curtain facades and concrete structures. Very durable (4 months uncovered is not the limit).

DuPont ™ Tyvek® Solid

The material is endowed with the highest characteristics, in particular, it has excellent vapor barrier. Acts as a protector of various roofs and facades from wind gusts and other weather conditions. Has an anti-reflective coating, can be laid directly on thermal insulation and rafters. Suitable for both commercial and individual houses.

Tyvek® Solid Silver

Perfectly saves energy at home, in winter it gives warmth, and in summer - comfort from coolness. Allows you to save on heating and air conditioning up to 15-20%.

DuPont ™ Tyvek® Supro Tape Membrane

Long lasting waterproofing / vapor barrier film with top quality adhesive tape. Perfectly protects from winds and various precipitation roof slopes of different load-bearing structures or not.

It is indispensable for the construction of roofs of both non-residential buildings and residential buildings.

DuPont ™ AirGuard® Reflective

The most advantageous offer for those consumers who want to achieve thermal resistance of the entire room in winter, due to the reflection of thermal radiation inside the home. The vapor barrier layer makes it possible to enhance the effect of thermal insulation and makes the building more energy efficient.

Tyvek AirGuard® Reflective

Moisture tightness, tightness, fur. strength, low condensation, low heat loss at convention - these are all vapor barrier films of the specified model. In addition, it does not lend itself well to fire, meets all international standards as a material based on rubber and plastic. Able to reflect about 95% of warm radiation.

Tyvek AirGuard® SD5

The building membrane of modern times is an excellent choice when you need to lower heat losses, to minimize the formation of condensation inside the thermal insulation material. Lightweight, easy to install, with mechanical strength, with steam control, with full compliance with the European standard certificate (EN 13984), the film is very popular in all parts of the Russian Federation.

Because its main advantages are: the absence of a "greenhouse" effect, a comfortable humidity and temperature balance in the house, environmental friendliness and safety for the outside world.

Diffusion type waterproofing film DELTA-VENT N and DELTA-VENT N PLUS

The 3-layer film is perfect for completely insulated roofs and is a PVC-based nonwoven fabric (the layers are glued together with ultrasound). Features self-adhesive edges for quick wind and waterproof styling (no tape or glue needed).

Such a roofing film has a gray surface with a matte effect, low weight (130 g / m2), high resistance to fur. damage and data stability.

2-layer premium film with an anti-condensation layer that retains and then removes condensate due to diffusion. Is the guarantor of such important feature like waterproofing. Resistant to bursting and steam penetration (this is facilitated by a polyurethane coating).

When laying, it is convenient in that it has a non-woven material and a cellular surface on its underside - during cutting, even edges come out and the canvas is minimally spent. It is widely used in roofs without decking or with formwork.

4-layer fabric with a reflective layer made of aluminum, belongs to the premium class. Used on flat and pitched roofs.

During its operation, you will achieve complete vapor barrier, also, such a film helps to save energy.

The film is endowed with record strength features, the highest ductility, improved thermal protection and 99% shielding electromagnet. radiation.

Tyvek® Roof Films and Acrylic Tapes

Tyvek® acrylic tapes are available as single-sided or double-sided. 1-sided tapes are good at sealing overlaps, they are excellent for a variety of membranes and as a sealant it copes well with joints at the junction of doors, windows, pipes.

Double-sided tapes have more possibilities: they have excellent adhesion in humid conditions, they are suitable for all membranes, which allow gluing both to each other and to smooth surfaces.

Roof waterproofing anti-condensation film - overview of materials, MY ROOF

Roofing waterproofing film on MY ROOF | Roofing films - the possibility of excellent vapor and waterproofing! Roofing films ...

The problem of wetting thermal insulation materials is relevant for any specialist construction area... It is due to the fact that under the influence of moisture, it not only loses its functionality, but also requires replacement after repeated wetting. To cope with this problem will help anti-condensation film... It can become a reliable barrier to moisture in the under-roof space and can be used both during construction and during repair work.

Material features

Anti-condensation waterproofing film made from a material such as polypropylene. Non-woven textiles are applied to one side of it, the pile of which effectively retains water. The mass of retained moisture can be several times the mass of the film itself. At the same time, it itself will effectively prevent the blowing of rain and snow from the street, and will also increase the functionality of any roof, since:

• not afraid of exposure ultraviolet rays;
• excludes the transmission of heat from the inside to the outside;
• has decent strength characteristics;
• will serve for a long time;
• will delight you with the ease of installation.

Thus, thanks to the application waterproofing under-roof anti-condensation film, any roof will become even more functional and durable!

When are they used?

Anti-condensation waterproofing films are used in the event that a conventional diffuse membrane does not cope with the functions assigned to it. These functions are to ensure the protection of the layer of heat-insulating material from the destructive effects of condensation and to ensure effective removal of moisture. Thus, anti-condensation film for metal tiles(other Decoration Materials) is an versatile material, which can be used in a variety of cases. For example, for arranging an uninsulated under-roof space or for waterproofing a roof located above a room with high level humidity. Another advantage of using of this material is its ability to ensure the removal of moisture from those premises in which the so-called "wet" technology was used for finishing. Their use will be advisable during the construction of the roof before carrying out finishing works... In this case, they will protect the thermal insulation layer from the damaging effects of ultraviolet rays. This became possible due to the fact that the film itself is not destroyed under their influence. It should be noted that despite the additional costs of purchasing and installing this material, savings of almost 50% can be achieved by extending the life of the roof.

The article describes the main properties of materials present on the construction market that protect the roof from moisture. In order not to be mistaken in the choice, we will consider the features of the choice of a particular material depending on the type of roof and the type of roofing.

• Vapor barrier films
• Perforated waterproofing films
• Waterproofing films with anti-condensation coating
• Membranes.

STEAM INSULATING FILMS

Application.Vapor barrier films are used in houses with insulated roofs to isolate insulation from vapors that rise from the inside of the house.
Mounting.It is very important to tightly perform all the joints of the vapor barrier (between the sheets of the film and at the points of abutment to the structural elements). With leaking joints wet air from below (from the premises) will penetrate into the thermal insulation and worsen its properties. (These 2 paragraphs are on a different topic, so don't start with bullets.)
Choice.When choosing a vapor barrier, you need to pay attention to the vapor permeability of the material - δ (mg / m2 * h * Pa). Water vapor permeability shows how many milligrams of water vapor passes through a film with an area of ​​1 sq. m in 1 hour (while the air temperature on both sides of the film is the same, and the difference in the partial pressure of steam is 1 Pa). The lower the vapor permeability number, the better the vapor barrier. (in the description of membranes below - another unit of measurement, you only need to choose one ..)

PERFORATED WATERPROOF FILMS

Application.Perforated waterproofing films can be used with all types of roofing.
Mounting.The vapor permeability of these films is lower than that of thermal insulation, therefore, when installing them, it is imperative to make 2 ventilation gaps (for a description of ventilation gaps, see the article ).
Advantages:

1. Low price. However, it is worth checking if the roof structure is actually cheaper with such films than a roof with a membrane. As it was described, such films can work successfully only if there is a lower ventilation gap - between the thermal insulation material and the film. The lower ventilation gap is made with an additional lathing, which is mounted on top of the rafters. Thus, it will be necessary to use more wood. In addition, you will need more. Supplies: antiseptic, antipyretic, fasteners and additional time for the installation of the roof.
2. Such a film is the most economical (in comparison with membranes) version of the waterproofing device. pitched roofs with a cold attic, it protects the thermal insulation of the upper floor ceiling from moisture. If, however, a membrane is laid in this structure, then part of its characteristics will simply not be used, and the perforated film is best combination price / quality for such a roof.

Disadvantages:

1. If the roof has complex shape(several ends, transitions, different levels, roof windows etc.), then it is not easy to provide a ventilation passage free for the air flow (especially in the space between the rafters). In this case, there is a threat that the humid air will not be able to completely erode from the insulation, therefore, remaining in it, moisture can lead to the formation of fungus and mold.
2. Such films are more difficult to install than membranes, since you need to make an additional crate for insulation for the device of the lower ventilation gap, as mentioned above.

Choicewaterproofing films should be based on:

1. Water resistance (waterproof). Waterproofness, as the name suggests, is the ability of a membrane to resist moisture penetration from the outside - rain, snow, etc. It is measured in millimeters (mm) of water column. This indicator should be at least 0.3 m. Water column. If the water resistance of the film is lower, then it cannot serve as a temporary roof even for a short time, therefore it must be covered with roofing material immediately after installation.
2. Resistance to infrared (IR) radiation, since the film is exposed to a strong heat flux, and the time of resistance to UV should be at least 2 months.
3. Strength. Strength must be at least 150 N / 5cm

ANTI-CONDENSATE FILMS

Application.They are used with metal roofs - metal tiles, folded roofing.
Mounting.The fleecy side of the film absorbs moisture, preventing it from entering the inner surface of the roof. Therefore, you need powerful ventilation of the under-roof space to remove moisture drops. For these purposes, it is imperative to make the lower ventilation gap.

• Films of this type protect the inner surface of the roof from moisture, but do not protect against condensation in summer time when moisture penetrates under the roof from the outside during a hot time of the day and cools down at night.

Choice.When choosing an anti-condensation film, you need to pay attention to vapor permeability. It should be close to zero (about 0.3 g / m2 hPa) in order for the film to provide maximum protection metal roof from condensation and subsequent corrosion.

DIFFUSION AND SUPER-DIFFUSION MEMBRANES

Application.Membranes CANNOT be used in conjunction with roofing materials with high thermal conductivity: metal tiles and euro slate *. The exception is special volumetric diffusion membranes (see below). CAN be used with ceramic, cement-sand, bitumen shingles, or composite metal shingles - these roof coverings have a lower thermal conductivity than simple metal shingles and corrugated sheets. In addition, a layer of acrylic primer on inner surface composite metal tile protects it from moisture.
Mounting.They are mounted on roofs of complex configurations, since it is difficult to make a lower ventilation gap on them using an additional lathing.
Advantages.One upper ventilation gap is needed (material savings, since no additional lathing is needed).

* The issue of using membranes with Euroslate is still controversial, and there are no final recommendations. In this case, we were guided by the fact that the Euro-slate has a high thermal conductivity.

VOLUME SEPARATING DIFFUSION MEMBRANES

Application.They are used for seam and other metal coatings - zinc, copper, steel, aluminum. Especially suitable for titanium-zinc coatings on gentle slopes (3-15 °). Also recommended for complex roofs.
Advantages:

1. Protects the roofing from condensation, as there is constant ventilation, thanks to the volumetric grille.
2. Only one upper ventilation gap is needed, which is often provided by the membrane itself.

Choice.For membranes, the main quality indicator when choosing is vapor permeability. According to European standards, vapor permeability is assessed using the Sd value - an indicator of the thickness of the resistance to diffusion of water vapor, while the lower its value, the better the membrane: from 0.02 to 0.4 m. According to Russian standards, the vapor permeability of membranes is measured in g / (m2 day): at Moreover, the higher the number, the greater the permeability of the film: the optimal (sufficient) indicator is 1000-1100 g / (m2 day)

Anti-condensation films, as well as membranes, according to builders, are best suited for attics. Choice between anti-condensation films and diffusion membranes depends on the used roofing material:

• diffusion, superdiffusion membranes are mounted with one upper ventilation gap (between the membrane and the roof) - under roofing with lower thermal conductivity: natural and cement-sand tiles, bituminous shingles etc.
• volumetric membranes are mounted, they are mounted with one upper ventilation gap (between the membrane and the roof) - under the metal roofing.
• anti-condensation films - mounted with two ventilation gaps - upper and lower.

  Suitable for metal roofing - metal tiles, corrugated board, standing seam roofing and euro slate.

Let's summarize everything that was mentioned above, considering the use of roofing waterproofing materials with concrete roofing in heated houses.

Roofing made of soft (bituminous) shingles

As a waterproofing, it is possible to use diffusion and super diffusion membranes with one upper ventilation gap or waterproofing films made of polyethylene or polypropylene - when installing two ventilation gaps. The rafters are installed, then waterproofing is placed, a counter-lattice is laid on top, then the lathing, solid flooring, tiles, insulation (thermal insulation) and then vapor barrier.

* Installation of waterproofing films is carried out by the same method for roofs with any coating. Read more about the installation of waterproofing and vapor barrier films in the next article.

Metal roofing (without internal acrylic coating)

An anti-condensation film is recommended as waterproofing, since the metal has a high thermal conductivity, and with a daily temperature drop on the lower surface metal coating condensation appears. It is also possible to use waterproofing films. DO NOT USE DIFFUSION MEMBRANES *, except for special volumetric separating diffusion membranes (see the article "Roofing films and membranes. Types and materials of roofing films and membranes").

To eliminate moisture between the metal tile and the waterproofing, an upper ventilation gap with a height of about 40 mm is created using the crate. A lower ventilation gap is provided between the thermal insulation and the waterproofing. From below, the heat-insulating material (insulation) is protected by a vapor barrier film. The vapor barrier is mounted on the inner surface of the rafters with a stapler - a staple gun, overlapped and connected with adhesive tape.

* You can read more about the installation of anti-condensation film in the next article.

Composite metal roofing (with internal acrylic coating)

From below, the thermal insulation is protected by a vapor barrier. It is also possible to use waterproofing films as waterproofing, while two ventilation gaps are arranged.

* More details about the installation of diffusion membranes - in the next article.

Natural tile roof

It is recommended to use a diffusion and superdiffusion membrane with a single upper ventilation gap as waterproofing. Waterproofing films are also used. As a vapor barrier that protects the thermal insulation from below - a vapor barrier film. When using waterproofing films, two ventilation gaps are arranged - an upper and a lower one.

Slate roof

Asbestos-cement slabs - it is possible to use as a waterproofing diffusion and superdiffusion membrane with a single upper ventilation gap between the membrane and the roof.

It is also possible to use waterproofing films made of polyethylene or polypropylene, then you need to arrange two ventilation gaps - upper and lower (between thermal insulation and waterproofing). A vapor barrier film is used as protection against steam from the inside.

Euro slate roof

Euroslate has a high thermal conductivity, with a daily temperature drop, condensation appears on its lower surface.

Therefore, anti-condensation films and other waterproofing films are used as protection, and DO NOT USE DIFFUSION MEMBRANES (as already mentioned above, this is a controversial issue). Two ventilation gaps are required - an upper and a lower one. A vapor barrier film is used to protect the thermal insulation from steam from the inside.

Seamed roof

It is also possible to use waterproofing films (both perforated and non-perforated) made of polyethylene or polypropylene and vapor barrier films with two ventilation gaps. DO NOT USE DIFFUSION MEMBRANES, except for special volumetric separating membranes for metal folded roofs (see the article "Roofing films and membranes. Types and materials of roofing films and membranes").

Slate roof

It is also possible to use waterproofing films made of polyethylene or polypropylene and vapor barrier films with two ventilation gaps.

In unheated homes and homes with cold unheated attics vapor barrier is not satisfied. Only waterproofing is laid. It is recommended to use a perforated waterproofing film made of polyethylene or polypropylene for these purposes.