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The technology for laying a vapor barrier layer involves gluing the sheets together. IN modern construction For these purposes, special tape is used. If you choose simple stationery material, then there is a risk of moisture getting into the insulation. Since there is a large amount of adhesive tape in stores, let's figure out how to glue the vapor barrier.

The vapor barrier film is laid on the inside of the room, under the thermal insulation. Its task is to protect thermal insulation from moisture from residential premises. The film itself does an excellent job, but fumes can penetrate through the joints of the canvases. To do this, each joint is insulated with special tape.

If you do not seal the joints, moisture will penetrate into the insulation, causing it to begin to lose its insulating properties. Wet mineral wool protects against cold 60% worse than dry.

In addition, when gluing the vapor barrier in the house itself, comfortable humidity and microclimate are maintained. This happens because the insulation absorbs vapors from the air, making it drier. Due to lack of water, problems with the health of the skin and respiratory tract can begin.

It is necessary to glue the joints of the vapor barrier layer when building a new house or major renovation roofs. It is also recommended to check the quality roofing pie when buying a house, be it an old or modern building. The adhesive tape may come off over time due to age or due to poor quality installation work. In such a situation, you have to undertake repairs and it is important to choose the right type of adhesive tape and manufacturer.

Types of scotch tape

Construction tapes have two factors by which they can be distinguished. Firstly, there are different structural solutions. They produce single-sided tape for gluing vapor barriers end-to-end, and double-sided tape for installing overlapping sheets. Secondly, there is a wide variety of materials used to glue the film, from which the joining tapes are made:

1. Aluminum. Adhesive tape 50-100 mm wide, consisting of a layer of aluminum, protective paper and glue. The thickness of the metal in the film is no more than 40 microns, but it provides sufficient strength for work. This option is not suitable for all types of vapor barriers.
2. Reinforced aluminum. Here a reinforcing layer is added, which increases the strength of the material. The width remains the same as in the previous version.
3. Polypropylene. The most budget option for gluing, which can be found in any store. Typically the width does not exceed 50 mm and the thickness is 100 microns. Not recommended for use in construction due to the high probability of peeling off.
4. PTL tape. Consists of several layers: plastic film on the outside, fabric in the center and rubber-based adhesive on the working side. Quite rare adhesive tape with a thickness of 200 microns.
5. Butyl rubber. Most suitable option for connecting vapor barrier materials to each other. Suitable for most materials. Has a width from 15 to 50 mm.

Brands of connecting tape

In order to choose the appropriate option, it is not enough to know only the technical characteristics or material of the adhesive tape. When you come to the store, you already need to know the brand of adhesive tape and tell it to the manager. Below we will look at some popular options; based on this information, you can decide exactly what is suitable for your needs.

Izospan SL

This tape is used simultaneously to seal the joints of hydro and vapor barriers. It was designed to seal joints protective films to structures passing through the roofing pie attic floor. For example, it is used near chimneys, pipes and ventilation ducts or roof windows.

In addition, its working surface adheres perfectly to the walls and provides a reliable, hermetically sealed connection. Therefore, Izospan SL tape is used to treat the edges of the vapor barrier layer in the attic.

Concerning technical characteristics, then the most important information here concerns adhesion strength. If we talk about the connection with concrete, then the tensile strength is 0.1 MPa. But gluing to metal surfaces is not recommended, as adhesion is reduced tenfold.

The water absorption of adhesive tape is equal to 0.2%, this is excellent result, when compared with roofing roofing felt, whose indicator fluctuates within 2%. The operating temperature is between -60 and + 140 °C. This tape is suitable for use in any area.

Izospan SL belongs to the group of double-sided adhesive tapes, so it is only suitable for installing overlapping vapor barriers. To do this, tape is glued to the edge of the first roll, then the release paper is removed and the second roll is applied.

TechnoNIKOL

This tape has working surfaces on both sides. The basis for the tape is polypropylene, but despite this, the material performs its functions perfectly. The length of one roll is 25 meters and the width is 3.8 cm. Thanks to the low cost, about $3 per piece, you can save on insulation without losing quality.

TechnoNIKOL adhesive tape is intended only for gluing vapor barrier rolls. It cannot be used when sealing film junctions with load-bearing structures. Most often it is used in residential private construction and industrial buildings.

Ondutis ML and BL

The mounting tape is designed for a service life of up to 15 years. Depending on the marking, the scope of application and the surfaces to which the tape can be glued differ. So, ML is a tape with an adhesive composition on both sides of the fabric base. The connecting compound is synthetic rubber, which is durable and reliable. Available in rolls 50 mm wide and 25 meters long. Designed for gluing vapor barrier in roofing pies and walls.

Ondutis BL also has two adhesive sides, one of which is covered with non-sticky paper. Used to seal joints between vapor barriers and hard surfaces. It is used to process connections with brick, concrete and wooden walls. In addition, it can be used as a film attachment concrete walls.

Nicoband

A more expensive version of vapor barrier tape that has an aluminum base and two adhesive surfaces. The tape has several color options and is produced in rolls 10 meters long and 100 mm thick. The cost of this option is $11, which is explained by the scope of application.

Nicoband mounting tape is used to seal external seams. It is able to firmly bond the insulating film to plaster, wood, metal, roofing covering and concrete. The manufacturer guarantees a tight connection for 10 years.

Scotch tape selection criteria

Remember that stationery tape is definitely not suitable for gluing vapor barrier film. It is not designed for a strong connection to rough surfaces, so it falls off after a few hours. Even if it seems that it has stuck securely, keep in mind that the manufacturer did not expect the use of its adhesive tape in frosty conditions.

When choosing mounting tape, pay attention to the following factors:

• if you plan to use it outdoors, the tape must withstand ultraviolet radiation and precipitation;
• the level of water absorption should not exceed 0.2%;
• it is important that the operating temperature coincides with the climatic zone;
• choose tape for specific works, either for sealing film or for bonding to hard surfaces;
• minimum service life 10 years.

Vapor barrier tape is a special construction tape that is used to seal the seams of vapor barrier films. Using unsuitable adhesive tape leads to its peeling off and moisture getting into the insulation. As a result, the house loses its thermal insulation properties.

In this article, we will look at the main types of adhesive tapes for vapor barriers, help you make the right choice, and tell you about the nuances of installation.

Types of adhesive tapes for vapor barriers

All construction tapes can be divided by structure and material. According to the structure there are: one-sided and Double-sided tape. The first is used for fastening the canvases “joint to joint”, the second - “overlapping”.

Depending on the type of material, adhesive tapes come in the following types:

Aluminum tape	a kind of sandwich made of aluminum tape (thickness 20-40 microns), protective paper and an adhesive layer. It copes well with its main task, but is not suitable for all types of films. Typical tape width is 50-100 mm
Reinforced aluminum tape	It differs from conventional aluminum tape in greater strength due to the presence of a reinforcing layer. Width 50-100 mm
Polypropylene tape	inexpensive. Sold in any store. The disadvantages of this tape include its low reliability when gluing vapor barrier films. The width is about 50 mm, and the thickness is 20-100 microns.
TPL tape	fabric base is combined with rubber-based adhesive and polyethylene coating with outside. They are rarely used to seal joints. Thickness 200 microns, width 50 mm.
Butyl rubber tape	has good adhesion and adheres perfectly to the vapor barrier. Width 15-50 mm

Mounting tapes Ondutis ML and BL

Ondutis ML is a double-sided self-adhesive tape on a fabric basis. The synthetic rubber that is part of Ondutis ML provides a reliable connection for 15 years. Scotch tape is used for installing vapor barriers on floors, roofs and walls. Standard width- 50mm. Harmless and non-toxic.

Ondutis ML is used as a universal mounting and sealing tape when installing vapor barriers and roofing films on building envelopes. It is used for hermetically sealing joints of vapor barrier films on walls, roofs and ceilings.

Ondutis BL is a double-sided self-adhesive mounting tape on anti-adhesive (non-sticky) paper. The tape provides a reliable vapor-air-tight connection for 15 years. One package contains two rolls of 25 m each.

Ondutis BL is used for sealing connections to hard surfaces (concrete, brick, wood) and through roof elements (chimneys, ventilation ducts, etc.), as well as for attaching films to brick and concrete walls during installation.

How to choose and buy the right vapor barrier tape

You should remember the main rule - ordinary stationery tape is not suitable for gluing vapor barrier sheets. Due to the roughness of the outer side of the film, it will fall off literally the next day. When choosing adhesive tape, you should consider the following properties:

• resistance to ultraviolet radiation and atmospheric conditions;
• low level moisture absorption (0-0.2%);
• operating temperature (ranges from −40 to +75-80 ⁰С);
• adhesion to a certain group of materials (film, metal, wood, concrete and others)
• service life (15 years or more).

It is not recommended to buy products from unknown manufacturers. Firstly, they can be toxic, and secondly, no one guarantees the quality of gluing. Butyl rubber types of construction tapes are better suited for vapor barriers.

In order to turn the vapor barrier into a continuous shell without holes or tears, it is necessary to connect its panels in a special way. Only then will she be able to perform her functions flawlessly.

In the process of forming connections, vapor barrier tape is used, on one or both sides of which a strong adhesive is applied. Now builders are offered a wide range of adhesive tapes for vapor barrier materials, for the correct selection of which information about the characteristics and properties is needed.

Vapor insulation is constructed from polymer films designed to prevent the penetration of vapors into the thickness of insulation systems. It's thin roll materials with minimal, and most often almost zero, vapor permeability. Due to their high structural density, they become a reliable barrier to traffic warm air containing suspended water.

The vapor barrier carpet is always laid as the first layer in the roofing pie, if we consider the system of arranging an insulated roof from the premises. It is he who must be the first to meet and, if possible, completely repel the attacks of steam or reduce to a minimum what manages to penetrate the vapor barrier.

Otherwise, the water will settle in the insulation and will persistently destroy both the thermal insulation and the building structures surrounding it. A fungus will grow inside the system, increasing its colonies at a fantastic rate. Wet insulation will not be able to protect the house from heat loss, because... the water that soaks it actively contributes to heat loss.

The vapor barrier films themselves do not allow evaporation to pass through at all unless they have any damage. However, steam can leak through weak joints of the material panels or the complete absence of them if the gluing of the strips was neglected during construction.

You can refuse to use adhesive tape only in case of waterproofing cold roof. The specifics of the installation allow you to do this. The panels of waterproofing film are laid from bottom to top, it turns out that each subsequent strip overlaps the underlying one. As a result, water flows down like fish scales.

Vapor barrier protection is arranged somewhat differently, although the principle is still the same: water should flow down the insulating carpet without returning to the room and without lingering in the insulation. The panels are laid across the rafters, but do not start from the eaves line, as is the case with the organization of waterproofing, but from ridge girder.

If we consider the vapor barrier carpet from the side of the room, it is clear that each underlying strip overlaps the lower edge of the upper panel by 10 - 20 cm. The specified overlap is necessary so that moisture or glass penetrates inside the insulation system ventilation gap down, or moved away along with the air circulating through the ducts.

The overlap line between the strips of vapor barrier film must be sealed so that moisture suspended in the air does not penetrate through this very vulnerable area. This is why you need a tape for gluing vapor barrier panels, the correct choice of which depends on the installation conditions and the upcoming operation of the roof with a vapor barrier carpet.

Features of steam protection construction

Our ancestors made the most ancient type of vapor barrier from fatty clay. It was spread in a continuous layer over the ceiling from the attic side, and a layer of dry earth was laid on top - the result was significantly more effective than new thermal insulation options.

Over time, clay was replaced by glassine, which is not particularly wear-resistant and resistant to external influences. He could not hold water on himself, i.e. was absolutely unsuitable for constructing a roof during the rainy season, and suffered from UV rays in the heat. In addition, it could easily be damaged during installation, which somewhat increased the construction budget and forced a considerable part of the work to be redone.

Instead of fragile glassine, they began to be used at first polyethylene films, then their polypropylene analogues. Now, on the same polymer base, a wide range of specialized vapor barrier materials are produced with optimized strength properties, improved characteristics, and increased resistance to atmospheric and mechanical influences.

All vapor barrier materials currently used in construction can be divided into the following three most common groups:

• Films made of polypropylene or polyethylene, including reinforced versions. Mainly used in insulation schemes ceilings, where they fit on horizontal plane, therefore do not require gluing. Used as waterproofing for cold roofs.
• Membranes with anti-condensation properties. Polymer materials with an internal rough surface installed towards the movement of vapors. Opposite smooth side resists water seepage from outside. Used in the construction of attics.
• Foil membranes. Polymer films with foil inside, To outer surface Often a layer of thermal insulation is attached. Plays the role of vapor barrier and material with reflex properties, are installed in Russian steam rooms, Finnish saunas and other rooms with similar humidity and temperature operating conditions.

The foil and anti-condensation steam protection panels are glued together with tape, one or both sides of which are equipped with an adhesive. Let's look at how connections are made, where and when gluing is performed, and what methods are used.

General installation rules

In order for the vapor barrier to flawlessly cope with its assigned function, it must be laid correctly. The main rule that requires strict adherence is: vapor barrier materials are laid in the same way as a roll is rolled out. There is no need to rewind or turn over the material.

In addition, for convenience in performing the work, the manufacturer indicates the side of installation and the amount of overlap. There is no need to experiment in this matter, because... The system developers thought through and provided for all the nuances.

To avoid spontaneous formation of condensation in the body of the roofing pie, it is necessary to arrange under-roof ventilation. Its organization is carried out in the case of laying conventional films of polypropylene and polyethylene in front of the insulation mansard roofs. To do this, by attaching the counter-lattice to the rafters, ventilation channels - vents - are formed on the side of the premises.

If membranes are used in the installation of insulated attic roofs, there is no need to construct ventilation ducts. These materials are allowed to come into direct contact with the insulation without the risk of it being moistened by condensation formed inside the system.

To construct a vapor barrier of any type, it is advisable to wait for dry, windless weather, regardless of whether the material is able or not to resist the pressure of the water column. Vapor barrier materials are attached to rafters or laths; the distance between supports for fixation should not exceed a limit of 1.2 m.

Construction steps include several equivalent steps, independent of the material used in construction:

• Rolling out the vapor barrier membrane. The starting strip of material is rolled out across the rafters. Work begins from the line of the ridge girder and continues with longitudinal panels down to the eaves.
• Attaching the film to the rafters. TO truss structure The vapor barrier is secured with glue, staplers or galvanized nails with a large flat head.
• Maintaining sag. When attaching to the rafters, it is necessary to create a slight slack so that the material is not tightly stretched between the attachment points. The membrane should “sag” by about 2 cm per meter. This is necessary so that, with standard movements for lumber, they do not tear the film.
• Location of overlaps. The panels of material should overlap each other horizontally by 10–20 cm, vertically by 15–20 cm, depending on the manufacturer’s recommendations. Overlaps should be placed over rigid elements of the rafter system.
• Solid fixation. After the initial fastening of the membrane during installation, it should be thoroughly fixed by installing lathing.

The sheathing, constructed in front of the vapor barrier, forms the next row of ventilation ducts required to ensure the distance between the attic cladding and polymer material. At the same time, the laths serve as a base for installing the sheathing.

Types of adhesive tapes for vapor barriers

When choosing a vapor barrier material for the construction of a roofing pie, you need to remember that the adhesive tape for connecting the panels and the film must be produced by the same manufacturer. Often when using products different brands There is no gluing effect or it does not last long.

The membranes are joined using connecting tape specifically for vapor barrier, because it eliminates the formation of capillary moisture in the connection area:

• panels laid next to each other;
• adjoining to elements passing through the roof - chimneys, antennas, communication risers;
• adjacent to adjacent building structures, including parapets, panoramic windows, doorways and etc.

The choice of vapor barrier material to protect structures from evaporation depends on the conditions of the upcoming operation, which must be unconditionally taken into account before purchasing. In addition, you need to carefully study the instructions for installing a vapor barrier so as not to encounter the impossibility of installation right on site.

Single-sided tape for tight joints

This type of adhesive tape is used to join sheets of vapor barrier material by placing an overlap over the edge that overlaps an already installed adjacent sheet.

Single-sided tape with the DELTA® logo and the product name TAPE FAS 60/100 is a 6 cm wide strip with a laminated cardboard base and an acrylate adhesive on the working side. This tape cannot be used for gluing film materials made from chlorinated paraffin, and gluing to boards made from recycled materials is not allowed. It is not suitable for installation in swimming pools and bathrooms.

It is used exclusively for carrying out work inside a furnished attic or other room. Suitable for connecting vapor barrier protection to nearby smooth metal, wood, and plastic surfaces.

In the line of domestic products, an analogue is Izospan SL - an adhesive tape designed for hermetically sealing vapor barrier strips.

Self-adhesive self-expanding version

In the line of the German company Delta, similar products are represented by a tape with the nomenclature name DELTA-KOM-BAND K 15. It is used in the formation of sealed and airtight connections to adjacent structures and walls ventilation shafts, brick chimneys.

In the state offered to the buyer, the tape is compressed, resulting in the width of the sales offer being only 4 cm; after straightening the material, the width of the strip reaches 17 cm. It is made from polyurethane foam, reinforcement is installed on one side of the tape and an acrylate adhesive is applied.

This type of adhesive tape is suitable for outdoor work because... can be used for gluing to damp and even frost-covered surfaces. It is first glued to the film, and then pressed against the wall with a strip.

Elastic self-adhesive tapes

For sealing passages through the roof of communication risers, antennas, narrow steel pipes bitumen-rubber single-sided tape DELTA-FLEXX-BAND F 100 and DELTA-MULTI-BAND M 60/ M 100 is used.

These are universal adhesive consumables suitable for work both inside and outside the building. They are used in the arrangement of penetrations, they compensate for linear movements of building structures relative to each other, allowing them to move without losing the tightness of the constructed junction.

Universal adhesive tapes are used to repair damage to all types of insulating films, but are only suitable for gluing to smooth surfaces. Since they are designed for outdoor work, during development they were given resistance to UV and other atmospheric hazards.

The product range from the Izospan company includes a one-sided, weather- and UV-resistant tape labeled Izospan ML proff.

Double-sided tapes and their use

German-made double-sided tape, resistant to atmospheric negatives, with the nomenclature name DELTA-BUTYL-BAND B 15 is made of butyl rubber. Tape with two adhesive sides is used in joining vapor barrier panels and in eliminating defects such as breaks and cuts.

Double-sided tapes for insulating films are used for both external and internal views works, suitable for connecting to skylights, rafter legs and rigid decking. When making connections to building structures, it is necessary to install clamping strips to ensure perfect fixation.

In the line of Russian adhesive tapes, Izospan KL has similar characteristics. This tape is glued over the rolled-out vapor barrier strip, departing from its edge at the distance specified by the manufacturer. First, only the lower anti-adhesive paper is removed, after gluing, the upper one is removed, on which the next vapor barrier sheet is applied.

Metallized tapes for vapor barriers

When connecting vapor barrier materials to the metallized side, adhesive tapes coated with aluminum are used. Product from German brand roofing materials is called DELTA-POLY-BAND P 100.

This is a one-sided tape, it is made of polypropylene, with a metal coating applied to the outside. The width of this type of tape is 10 cm, its gluing ability significantly exceeds the properties of conventional tapes.

In the line of Russian products, Izospan FL Termo has equivalent qualities; this adhesive tape allows you to create a single heat-reflecting plane like a German product.

Adhesive tapes with a metallized side serve well in rooms with non-standard operating humidity and temperature conditions. With their use, steam rooms of Russian baths are equipped and supply dry steam Finnish saunas. Adhesive tapes are laid on dried and degreased vapor barrier sheets.

Video review of adhesive tapes for vapor barriers

Analysis of qualities and comparison of tapes for gluing vapor barrier panels from different manufacturers:

Video instructions for using single-sided tape Delta:

Guidelines for attaching vapor barriers to window opening:

It is worth familiarizing yourself with the specifics of laying and using adhesive tapes for connecting vapor barrier materials if you do not want to redo them many times own work, endlessly repair the roof and spend money on purchasing new components for the roofing pie.

Scotch tape ML is a double-sided self-adhesive tape on a fabric base made of synthetic rubber. It has good adhesion and a long service life, and also guarantees a reliable vapor-air-tight connection.

DELTA FLEXX-BAND F100

DELTA FLEXX-BAND F100 is an elastic one-sided bitumen-rubber tape with adhesive, with high adhesive ability on a high-strength tape made of nonwoven fabric, for sealing elements passing through the roof.

Scotch tape DELTA INSIDE-BAND I 60

Adhesive tape DELTA INSIDE-BAND I 60 Universal single-sided tape with high strength couplings for hermetic connection of vapor barrier films in the overlap area on the front side. Can be used to adhere films to metal, hard plastic, and smooth wood.

The best tapes and tapes for vapor-waterproofing

The main purpose of adhesive tapes and tapes for vapor barriers and waterproofing is to tightly connect the films in areas of overlap. This creates a sealed vapor barrier between the vapor-waterproofing and the walls, ventilation pipes passing through the roof, various connections, fixation to the Mauerlat or any other roof structures.

Double-sided tapes and tapes for various membranes, as a rule, guarantee the quality of work carried out with vapor barrier and waterproofing. It is also necessary to consider the connection of the counter-lattice with the films; for this purpose, a special sealing tape is provided, which ensures a tight connection in the places of nail fastenings.

Often the roofing film is fixed with a mounting stapler and that’s where it ends, but on a roof with a low slope this is a serious violation that will lead to leakage of vapors and condensate. You can buy double-sided tape or vapor barrier tape at any roofing store or order it through an online store, which will one hundred percent create a high-quality vapor barrier.

Price for adhesive tapes and sealing tapes

The price of adhesive tape varies; it differs from each other by manufacturers, as well as by the width of the roll and the length. Adhesive tapes create an excellent vapor-tight seal over the vapor barrier overlap and hydro-wind protection to create a durable roofing pie structure. These are inexpensive roofing accessories that you shouldn't skimp on. We have collected for you the best and most trusted manufacturers of sealing tapes and tapes that seal hydro-vapour barrier joints.

Video instructions for Delta® multi-band M60 tape

Video instructions for sealing tape Delta® schaum-band SB 60

Video instructions for joining tape Delta flexx-band F100