Vapor barrier tape for windows: technical characteristics. Vapor barrier tape for plastic windows - where to use and how to glue? Vapor barrier tape for PVC windows

Replacing windows in a residential or commercial space is always accompanied by the protection of the weakest components of the structure: the seams between the frame and the wall. It is produced by filling the space between the window opening and the frame using polyurethane foam. This material has excellent sound and heat insulation qualities. However, with insufficient or incorrect protection under the influence of moisture and ultraviolet radiation, the foam begins to collapse and lose its original properties.

To avoid this, you need to take measures to seal the seams and protect the filler. To do this, waterproofing is used on the outside, which prevents natural precipitation from getting on the porous insulation, while on the inside, a vapor barrier for PVC windows is used, which protects the foam from the effects of water vapor.

The structure of vapor barrier for a plastic window is shown

What should the vapor barrier be like?

Vapor barrier prevents moisture from the air in the room from being absorbed into thermal insulation material. The vapor permeability coefficient of vapor barrier of internal joints for PVC windows should be no more than 0.01 mg/(m*h*Pa).

To protect joints use:

silicone;
backing cords;
Lena PSUL;
butyl rubber tapes;
reinforced foil.

PSUL tapes are designed to create an assembly seam with natural ventilation.

The choice of vapor barrier should be made taking into account subsequent finishing. So there is material for dry construction (plasterboard, plastic), wet plaster, there is separately for protecting joints wooden windows V wooden houses, for internal and external use.

The tape can be either single or double adhesive

Butyl rubber tapes are similar to self-adhesive foam rubber, but with a protective impregnation. With their help, all seams between the window and the wall of the house are sealed efficiently. Also, a vapor barrier for windows can have either one adhesive side or two.

Vapor barriers for PVC windows are distinguished by seasonal periods:

warm season with air temperatures from 5 to 35 degrees above zero;
winter period with temperatures below zero.

Read more: Why are plastic windows harmful?

Vapor barrier prevents the destruction of polyurethane foam under the influence of moisture, prevents the appearance of damp corners in window opening, the appearance of fungus and drafts.

If you don’t do a vapor barrier and slopes, there may be fungus

It should be noted that the price of vapor barrier for PVC windows is absolutely adequate and affordable to everyone. Very small costs for hydro and vapor barrier will increase the service life of windows, and protect the house from drafts and mold in the corners.

Installation of vapor barrier for windows

Below are general rules installation of vapor barrier for PVC windows, since for each a separate type tapes may have their own characteristics:

The window frame and opening are cleaned of dirt and dust.
The window is inserted into the opening without fixation; the places where the vapor barrier is attached are marked on the plastic.
The window is removed and a vapor barrier is glued to the marked places.

Concealed installation is carried out before the voids are foamed. The outer tapes are glued only after the mounting foam has completely dried. In any case, the vapor barrier tape is glued to the window in a continuous layer.

Do not forget that the choice of tape largely depends on the type of subsequent finishing. It is very important to use materials that comply with all moisture-permeable characteristics.

Where to buy? Prices

You can buy vapor barrier for PVC windows at any hardware store. If you have to replace windows in your home, consult with repairmen which vapor barrier is best for you to choose, taking into account the final finishing of the walls.

True professionals will give you practical recommendations. But, if you come across “experts” who insist that using vapor barriers for windows is unnecessary, kick them to the curb. Someone's incompetence can later bring you a lot of problems with dampness and drafts.

Hide

Vapor barrier is required for plastic windows. Vapor barrier tape allows you to close joints, seams, protect the structure from wind and precipitation. Thanks to this element, cold air will not enter the room through the joints, which will ensure the greatest airtightness of the room and minimal heat loss.

How to install windows correctly?

Modern builders most often use polyurethane foam for installation. M O Installation tape for windows together with sealant is applied after the foam has dried. It is needed in order to protect the material from moisture, as well as close possible cracks and stop the access of cold air to the room. If this condition is neglected, cracks will appear between the window frame and a wall through which cold air will enter the room. Drafts will appear, the windows will sweat a lot and freeze at the joints.

For the stages of window installation and common mistakes when installing them, see the link

When building a private house, you need to think in advance about the height, which ones will be more practical and look better.

Modern builders often use it to install doors and plastic windows. Read on the NBC website advice from professionals on how to choose it

What is vapor barrier used for in plastic structures?

It is worth considering that the more correctly the installation is done, the more reliable the structure will be and will last longer. Even if , but are inserted incorrectly, you will not get the desired effect.

It is necessary to ensure that workers are mandatory met the following conditions:

The inside of the installation gap should be filled with foam that is thicker than the outside.
The system must be three-layer. The first layer on the street side protects the entire pie from weather conditions, the middle layer is responsible for thermal insulation, and the inner layer protects against condensation.

Vapor barrier tape is necessary to protect the structure from water vapor.

To ensure that the vapor barrier does not interfere with plastering, special tapes should be used, over which the room can be finished.

What should you know about sealing?

Most often, windows are fastened using special bolts and: this material simultaneously serves as a reliable fastener, allowing you to adjust the position of the frame before the foam hardens, and as a high-quality insulation. However, sealing for the material is extremely important, since when moisture gets in, the foam begins to deteriorate over time, crumble and turn yellow, which negatively affects its properties.

Window tape works great to protect the foam. Even if you are going to use platbands, which will protect the structure from weather conditions, and can also give the frame decorative look, before installing them it is worth gluing the tape. It will help make the insulation high-quality, while making the work not much more expensive.

The most inexpensive and easiest to install vapor barrier for windows is a special tape, the sticker of which can be applied by anyone.

Greetings!

Today we will touch on a controversial topic. Is vapor barrier tape necessary when installing PVC windows?

I think you will be interested to know what it is and why it is needed.

Vapor barrier tapes are designed to improve performance characteristics window designs. The effect of their installation is comparable to high-quality finishing of slopes or laying construction joints. Installing such tapes will help prolong the functioning of the windows; you should under no circumstances refuse to install them.
Sealed tapes provide insulation of the assembly seam from excess moisture and steam; they prevent the movement of condensate onto slopes window design. Installation of such a tape is necessary if you have a kitchen, bathhouse or room with a swimming pool.

Types of vapor barrier tape

There are two main types of material: with one and two adhesive surfaces.

A tape with two adhesive surfaces, one side is attached to the wall and the other to the window.

There is a classification of tapes based on seasonality:

for summer, can withstand temperatures of 5-35 degrees;
for winter, suitable for temperatures below 0.

The width of the tape depends on design features profile, a wide range allows you to choose the option for seams different sizes. When choosing a tape, it is necessary to take into account that its width should be approximately 45 mm greater than the width of the assembly seam.

The composition of the tape for outdoor work includes foam materials, in this case, sealing compounds with plaster mortar are used, providing the required level of vapor barrier.

Vapor barrier tapes can be made from butyl rubber, they are used for sealing interpanel joints, as well as when installing windows and doors.
This tape consists of a non-woven fabric; during installation it undergoes priming, plastering and painting; this type also belongs to the group of self-adhesive ones.

Metallized vapor barrier tapes are also available on the market; they are designed to protect the installation seam of slopes for dry finishing from moisture.

Information about self-adhesive sealing waterproofing tape in the video:

General information on installing vapor barrier tape

The process can be divided into the following stages of work:

prepare the opening, clean it of dust, dirt and debris, insert the frame into the opening without temporarily securing it;
Carefully mark a line on the frame for mounting the tape;
carry out calculations, apply markings with the window, stick internal vapor barrier tapes onto the removed frame (the protective paper strip covering the adhesive must remain in place, it should not be removed.)

In accordance with the rules, the installation of vapor barrier tape is carried out before foaming the seam.
Before finishing, moistening and filling with foam, protective paper strips must be removed.

This is necessary to maintain the adhesive properties of the tape. When carrying out hidden installation from below, the strip is attached to the installation profile, on the sides and on top to the ends of the structure.

The following features must be taken into account:

external tapes are glued after complete polymerization of the polyurethane foam;
installation of the vapor barrier strip under the window sill is carried out at the final stage;
when installing a vapor barrier strip under a layer of plaster special requirements are presented to the outer coating of the tape, it must provide the necessary level of adhesion between the surfaces being connected.

If there are gaps between the wall and the frame of the window quarter, another technique is used: the uneven joint must be covered with a special window strip, after which a vapor barrier tape is applied.
Vapor barrier tape is glued around the entire perimeter of the window opening in a continuous layer.
It is also necessary to take into account that the use of finishing building materials together with vapor barrier tape is recommended only if certain moisture permeability characteristics are met.

Foil self-adhesive hydro-steam heat-insulating tape

Self-adhesive GPL strip allows you to solve problems associated with steam, hydro and thermal insulation of joints, assembly seams, junctions and joints in a wide variety of building structures - door and window blocks, plastic, concrete and metal products.

The vapor barrier layer provides the necessary level of waterproofing, which prevents the formation of mold, mildew and spores, resulting in an increase in the service life of any structure.

Advantages:

significant reduction in heat loss;
significant reduction in energy costs;
ease of installation achieved due to the adhesive layer;
ensuring reliable fastening of the film to building materials all types.

GPL - foil self-adhesive hydro-steam heat-insulating tape(width 90,120,150,200 mm, supplied in boxes measuring 420x420x600 mm). The choice of width depends on the design features of the window profile.

Installation steps:

clean, dry and degrease the surfaces to be treated, unwind the roll, cut the tape into pieces of the required size;
after removal protective film stick the film onto the surface, pressing tightly with your hands and without stretching, smooth it with a roller, avoiding the formation of air bubbles.

Work must be carried out at a temperature not lower than +10°C.

Self-adhesive steam-, hydro-, and heat-insulating tapes consist of foamed laminated polyethylene, on one side there is a layer of metallized polypropylene film. A special waterproof adhesive on the other side ensures reliable fastening material on structures made of metal, brick, concrete, wood, plastic, etc.

So, as the basis of the tape is foamed polyethylene, which has excellent thermal insulation characteristics, closed cell structure provides extremely low level hydroscopicity, which guarantees a high level of moisture resistance.

Polyethylene foam gives the film elasticity, which is very important when sealing uneven seams. Metallized polypropylene tape is intended for finishing the outer layer.
The advantages of polypropylene film include a high level of mechanical strength; the material is also resistant to organic solvents, acids and alkalis. Due to this provides reliable protection of the reflective layer from damage and oxidation.

Polypropylene film also has good vapor barrier properties.

Sticky layer is a waterproof adhesive made of artificial rubber with increased adhesion to various materials, which allows the use of vapor barrier strips without surface preparation.
The siliconized film protects the adhesive layer from sticking together in the roll.

Scope of application:

Dimensions and specifications

Material Dimensions:

thickness of NPE -Gazovka (mm) – 2;
thickness of polypropylene film (µm) - 20;
width (mm) - 90 / 120/150/200;
length (m) - 15.

Specifications:

thermal reflection coefficient – from 95%;
coefficient heat absorption at 24 hours, S - 0.48 W/(m2 °C);
coefficient thermal conductivity, at 20°C, no more than - 0.038 - 0.051 W/m °C;
specific heat capacity - 1.95 kJ/kg °C;
thermal resistance, m2 - 0.031 °C/W, per 1 mm of thickness;
vapor permeability - 0 mg/(m h Pa);
sound absorption, from - 32 dB;
dynamic modulus of elasticity (under load 2-5 kPa) - 0.26-0.6 MPa;
flammability group - G2;
smoke generating ability - D3.

T PVC window installation technology using vapor barrier tape in the video:

Installation of internal vapor barrier sealing tape

For internal sealing of the assembly seam, a vapor barrier (duplicated) strip is used.

Vapor barrier (duplicated) strip made on the basis aluminum foil laminated with non-woven fabric, provides the required level of moisture insulation of the installation seam, and is a reliable barrier to the escape of moisture onto the surface of the internal slopes.

Two adhesive strips made of butyl and glue located on different sides allow you to achieve easy and reliable fixation. It is recommended to stick the tape around the entire perimeter of the window structure for finishing slopes using the dry method., which will be carried out at the next stage.

In the production of vapor-tight sealing strips, a non-woven fabric coated with a self-adhesive plastic-elastic mass made on the basis of adhesive butyl rubber is used.
The main feature of butyl rubber strips is their heavy weight. When comparing butyl rubber tape and reinforced foil of the same width of 120 mm, it turns out that reinforced foil is almost five times lighter.

The low weight of the foil greatly simplifies the installation process, which reduces transport costs when transporting material over long distances.

Vapor barrier tapes with adhesive strips made on the basis of reinforced foil are distinguished by high adhesive properties only if the surface of the internal slope is well cleaned and degreased. Butyl rubber strips have better adhesion and a tighter fit to the wall opening. All these characteristics must be taken into account when choosing one option or another; if necessary, you can always consult a specialist.

Installation steps for internal vapor barrier sealing tape:

cut the material into pieces taking into account the length and width of the window structure (for corner joints), the joining of the strips along the length is carried out with an overlap, at least half of its width;
remove the protective paper from the duplicated strip and stick it on the outside of the frame;
installation of the strip is carried out using a self-adhesive mounting strip in a tensioned state (without bulges and folds, maximum) to the outer surface of the window frame with inside along the ceiling horizontal and vertical.

The inner edge of the adhesive surface and the inner edge of the frame must match exactly, the protective tape on at this stage cannot be removed.

The adhesive strip is highly resistant to cold temperatures while maintaining adhesive properties.

Deterioration of adhesion may be affected by prolonged exposure to cold conditions of acrylic adhesive tape with the release paper removed.

Working with cold window structures can also negatively affect adhesion, since when workers breathe, steam is released from their mouths, which partially condenses on the surface of the block, resulting in reduced adhesion of the adhesive surface.

In order to prevent this phenomenon, the interval between removing the anti-adhesive paper and directly gluing the tape should be minimal. Before gluing the tape, you must also wipe the surface of the window block with a paper napkin or dry rag.

Proper use on PVC windows

Question: How to properly use vapor barrier tape for PVC window structures, what should the temperature be?
Answer: Installation of vapor barrier tapes on plastic window structures is carried out as usual in rooms with high level humidity (swimming pool, sauna, kitchen).

The material protects the installation seam from the penetration of steam and moisture emanating from the room; the tape thus prevents condensation from escaping onto the window slopes. The vapor barrier strip may have one or two adhesive surfaces.
The tape with two adhesive surfaces is conveniently attached to slopes and windows. All vapor barrier tapes are divided into winter and summer, the choice depends on the time of year and weather conditions.

Summer tapes are designed for use at temperatures of 5-35 degrees, while winter tapes have proven themselves to be excellent in conditions below zero. The width plays an important role when choosing a tape; it should be 45 mm greater than the width of the assembly seam. Compliance with this condition will help achieve the required level of vapor barrier.

The technology for installing windows and gluing vapor barrier tape consists of several stages.

Necessary:

clean the window opening from dust and dirt, install the frame without fastening it, mark the installation lines of the vapor barrier tape on the frame and walls of the opening;
pull the frame out of the opening, stick the tape on it without removing the protective strip from the area intended for gluing to the wall.

Installation of vapor barrier tape on a plastic window is carried out in one piece; breaks are unacceptable.

The next stage involves assembling the window structure with sashes and major installation into the opening. At the final stage, the vapor barrier strip is glued to the window sill.

Example of installation of PVC windows with vapor barrier films in the video:

Materials for installing window structures

PSUL tape

PSUL tape is designed for installing window blocks and ensures the creation of a ventilated assembly seam.

The tape is manufactured in accordance with GOST 30971-2002 “Installation seams of joints connecting window blocks to wall openings.”

The material guarantees the durability and reliability of the installation seam. PSUL tape is a self-adhesive polyurethane foam tape impregnated with a special composition, which is supplied in rollers in a curled state.

An extensive selection of sealant sizes allows you to choose an option for sealing seams of any size.

PSUL tapes have wide scope applications, are distinguished by their versatility and multifunctionality.

The vapor barrier strip is used to protect fixed and moving joints from low temperatures, noise, moisture, dust and other unfavorable factors.

Standard areas of use:

sealing joints, as well as moving seams of blocks, panels and small structures on building facades;
sealing the gaps between the wall opening and the door/window frame;
sealing seams of adjacent sections of prefabricated structures;
sealing the space where translucent structures adjoin the walls.

Sun tape

The sealant is intended for finishing the internal slopes of window structures using the dry method (sandwich panels, plastic, plasterboard).

BC vapor barrier tape is used to create a ventilated assembly joint.

The material prevents condensation from moving to internal slopes windows, protects the mounting foam from moisture from the room.

BC tape is manufactured in rolls of 50 linear meters length, width have different standard sizes.

Lenta VS+

The tape is specially designed for sealing internal slopes of window structures using a dry method (sandwich panels, plastic, gypsum board).

Vapor barrier tape BC+ is used to organize a ventilated seam; the material prevents the movement of condensation onto the internal slopes of windows and protects the mounting foam from moisture from the room.

The adhesive layer is located along the entire width of the tape, covered with an anti-adhesive film on one side, and the adhesive strip is located on the other side for ease of installation.

BC+ tape is manufactured in rollers 25 linear meters long, the width varies.

Technology for using vapor barrier tapes when installing windows in the video:

VM tape

VM tape is specially designed for sealing internal slopes of window structures with subsequent application of plaster.

VM vapor barrier tape is used to organize a ventilated seam; the material prevents the movement of condensation onto the internal slopes of windows and protects the mounting foam from moisture from the room.

The adhesive layer is located across the entire width of the tape, covered with an anti-adhesive film on one side, and the adhesive strip is located on the other side for ease of installation.

VM tape is manufactured in rollers of 25 linear meters in length, with different widths and sizes.

Tape VM+

VM tape is specially designed for sealing internal slopes of window structures with subsequent application of plaster.

Vapor barrier tape VM+ is used to organize a ventilated seam; the material prevents condensation from moving to the internal slopes of windows and protects the mounting foam from moisture from the room.

The adhesive layer is located along the entire width of the tape, covered with an anti-adhesive film on one side, and the adhesive strip is located on the other side for ease of installation.

VM+ tape is manufactured in rollers 25 linear meters long, the width varies.

Water vapor barrier tape (GPL)

Self-adhesive tape GPL steam-, hydro-, heat-insulating. The material consists of foamed laminated polyethylene, the tape is covered with a metallized polypropylene film on one side, and a special adhesive is applied on the other side. The adhesive composition ensures reliable fastening of the tape to structures made of metal, brick, concrete, wood, plastic, etc.
The base is foamed polyethylene, characterized by unique thermal insulation characteristics. An extremely low level of hydroscopicity is achieved due to the closed cellular structure; the material practically does not absorb water.
The elasticity of the tape is achieved through the use of polyethylene foam, which is important when sealing seams with unevenness. The outer layer is a metallized polypropylene film.

Polypropylene film is characterized by increased strength and resistance to organic solvents, acids and alkalis. Due to this provides reliable protection of the reflective layer from damage and oxidation processes.

In addition, polypropylene film has excellent vapor barrier properties.

The siliconized film protects the sticky layer from sticking together in the roll.
Scope of application: steam, hydro and thermal insulation of joints and assembly seams in building structures - door and window blocks, metal, concrete, wooden and plastic products.

Water vapor barrier tape (GPL-S)

GPL water vapor barrier tape. The material consists of foamed laminated polyethylene, the tape is covered with a metallized polypropylene film on one side, and a special adhesive is applied on the other side. The adhesive composition ensures reliable fastening of the tape to structures made of metal, brick, concrete, wood, plastic, etc.

For ease of installation, an additional adhesive strip is applied on the film side.

The base is foamed polyethylene, characterized by unique thermal insulation characteristics. An extremely low level of hydroscopicity is achieved due to the closed cellular structure; the material practically does not absorb water. The elasticity of the tape is achieved through the use of polyethylene foam, which is important when sealing uneven seams. The outer layer is a metallized polypropylene film.

Polypropylene film is characterized by increased strength and resistance to organic solvents, acids and alkalis.

This ensures reliable protection against damage and oxidation processes.

Scope of application: steam, hydro and thermal insulation of joints and assembly seams in building structures - door and window blocks, metal, concrete, wooden and plastic products.

Rules for using GPL tape in video:

Window tape

The assortment includes large selection high-quality window tapes, in a wide variety of sizes and in required quantity. Interior and exterior window tape is widely used in most different areas construction and installation.

Window tape is a reliable connecting element, along the entire surface of which small holes are made in accordance with waterproofing standards. Wide selection Standard sizes allow you to choose an option for a wide variety of designs.

High quality window tapes

Window tape is a reliable connecting element, along the entire surface of which there are small holes.

In the manufacture of perforated tape, high-quality polyethylene foam is used, the scope of use is determined by the manufacturing technology. One of the areas of application is the installation of ventilation elements.

Effective filtration of dirt and dust from the street is achieved through holes through which accumulated condensate also exits.

Thanks to these features, a unique microclimate is created in the room, The price of mounting tape is not very high, which is one of the advantages of the material.
The advantages of window tapes also include accelerating the pace of construction; you cannot do without them when fastening parts with different expansion coefficients.

The advantage of double-sided window tapes is elevated level elasticity, which is important during temperature changes.

Vapor-permeable diffusion tapes are also produced, which are used to create effective ventilation and have an excellent level of moisture resistance.

Diffuse tape made of artificial membrane material is indispensable in the process of waterproofing installation seams and joints. The tape can have one or two adhesive strips; when choosing, it is necessary to take into account the construction tasks and the features of the window design. One of the strips is attached to the translucent structure, the other to the slope or wall surface.
A wide selection of standard sizes allows you to quickly select the right option for any building structure. Window tapes are equally suitable for both internal and external insulation during installation.

Innovative technology involves performing insulation in several layers: that is why there is a distinction between external and internal window tapes.

Interior window tape made from flexible material, has adhesive strips, it is specially designed to protect the seam from steam and moisture from the inside.
When creating outer tape waterproofing standards on the outside of the seam were taken into account.

Both types of material allow you to achieve the required level of moisture insulation while maintaining vapor permeability and protecting the structure from condensation.

I hope that in this article I helped you understand new window installation technologies and convinced you of the need to use vapor barrier tape.

For a comparative test of the characteristics of window tapes, watch the video:

Vapor barrier tapes for windows, like good finish slopes and installation seams will ensure decent window performance. In order for the window in your home to function well and for a long time, you should not miss such a moment as installing a vapor barrier tape. The use of sealed tapes to isolate the assembly seam from vapors and moisture in the adjacent room prevents condensation from escaping onto the slopes. If you have a kitchen, a room with a swimming pool or a bathhouse, then installing vapor barrier tape on your windows is a must.

Varieties

Tapes can be either with one or two adhesive strips. Two adhesive strips are intended for attaching the tape with one side to the window and the other to the wall.

Installation of vapor barrier tape

Also vapor barrier tapes are classified according to weather periods:

For summer period with air temperature from + 5°C to + 35°C;
For winter period with temperatures below 0°C.

Tape width also varies depending on needs, which allows for reliable vapor barrier of seams various sizes. When choosing vapor barrier tapes, keep in mind that its width should be about 45 mm greater than the width of the installation seam.

Tapes for outdoor work consist of foamed materials (this work requires well-sealing materials with plaster mortar, which will provide the required vapor barrier of the outer layer).

Vapor barrier tape can be butyl rubber, for sealing interpanel joints or for installing door or window blocks. This tape contains non-woven fabric. During installation, it is primed, plastered and painted. This type is also self-adhesive.

To protect against high humidity installation joints for dry finishing of slopes exist on the market metallized vapor barrier tapes.

Installed vapor barrier tape

General information on installing vapor barrier tape

Initially, you need to prepare your opening: clean the internal and external surfaces of the opening and frame from dirt, dust and other debris. The frame is inserted into the opening and is temporarily not secured.
Then gently mark a line on the frame for attaching the vapor barrier tape.
After carrying out the calculations and marking the window, we remove the frame and glue our internal vapor barrier tapes. We do not remove the paper strip that protects the inner adhesive layer, which will subsequently attach to the walls.

As a rule, the installation of a vapor barrier tape on a structure is carried out before the seam foams. Therefore, before finishing, dampening and filling with foam, you can remove the protective paper strips from the vapor barrier tapes. This will allow you not to lose the adhesive properties of the tape. If you are carrying out a hidden installation, then the tape should be attached to the ends of the structure from above and on the sides, and to the installation profile from below.

External thermal insulation tapes can be glued no earlier than the polyurethane foam has been completely polymerized.
Installation of vapor barrier tape under the window sill can be done in last resort. When a vapor barrier tape is installed under a plaster layer, the tape must have an outer coating, which will ensure the necessary adhesion to this plaster layer.

In that case if the window quarter has gaps between the frame and the wall, another technique is used: the uneven joint can be covered with a window strip, and a vapor barrier tape can be glued onto it. Installation of vapor barrier tape on windows is installed in a continuous layer along the entire contour of the opening.

Do not forget that the use of finishing building materials in combination with a vapor barrier tape is allowed only if the moisture-permeable characteristics are observed.

Capable of increasing quality characteristics design, which extends its service life. On sale you can find tapes that have an adhesive strip on one or both sides. It is designed to fix the tape to the window and wall. Among other things, such materials are classified according to temperature characteristics during operation.

The first variety is suitable for the summer period and can be used at temperatures ranging from +5 to +35 ° C, while products intended for winter can withstand temperatures below zero degrees. The width of such a strip can vary depending on the tasks, which allows it to provide a vapor barrier for seams of different sizes. When choosing a vapor barrier tape, you must take into account that its width should be 45 mm larger than the installation seam.

General description

The described tapes for external installation may consist of foam materials, they are required for and can be used in conjunction with a plaster mortar, which increases the vapor barrier characteristics. There is a vapor barrier tape for windows on sale, the characteristics of which are presented in the article. This material may be based on butyl rubber, which is intended for sealing joints and installation on window and window frames. The product consists of a non-woven fabric, is primed during installation, covered with plaster at the next stage, and painted at the final stage. This type has a self-adhesive layer. If you need a vapor barrier tape that will be used at high humidity, then you should install the material under the dry finishing of the slopes, using the metallized variety.

Characteristics of foil vapor barrier tape

Foil hydro-steam and thermal insulation tape is glued to clean, dry and pre-degreased surfaces. The material itself is supplied in boxes whose dimensions are 420x420x600 mm. It should not be used at temperatures below +10°C. The tapes are based on polyethylene foam, which is laminated and metalized with polypropylene film on one side, while on the other there is a waterproof adhesive layer that reliably ensures fastening of the material to concrete, brick, metal, plastic and wooden structures.

It is based on a material that consists of a closed cellular structure; it has low hygroscopicity and almost does not absorb moisture. Elasticity is ensured thanks to polyethylene foam, which guarantees sealing of seams with to varying degrees unevenness. High mechanical strength was achieved thanks to the presence of polypropylene film, which is resistant to alkalis, organic solvents and acids. The reflective layer is protected from mechanical damage and oxidation. The sticky layer consists of a water-resistant adhesive, which is created on the basis of synthetic rubber. It has improved adhesion properties different materials, which allows you to use the tape without preliminary surface preparation.

For reference

You don’t have to worry about the vapor barrier tape sticking together in the roll, since there is a protective siliconized layer on its surface. This type of steam-hydro-thermal insulation is used for seams, assemblies and connections of various building structures, including when installing window blocks, wood, metal, plastic and concrete products.

Material sizes

The film thickness is 20 microns, while the length is 15 m, and the width can vary from 90 to 200 mm. Intermediate values are 120 and 150 mm.

Specifications

Vapor barrier tape for windows has a high coefficient of thermal reflection, which reaches 95%. The thermal conductivity coefficient is very small, and at 20°C it is in the range of 0.038-0.051 W/m °C. The heat absorption coefficient during the day reaches 0.48 W/(m 2 °C). Thermal resistance is 0.031 °C/W, which is true for one millimeter of thickness. Professionals are sometimes also interested in such characteristics as specific heat. In the case of the one described, this parameter is 1.95 kJ/kg °C.

Under a load within 2-5 kPa, the dynamic modulus of elasticity can vary from 0.26 to 0.6 MPa. Vapor barrier tape for windows has another significant advantage, which is expressed in the ability to absorb extraneous noise. Thus, the sound absorption is 32 dB. The material belongs to the flammability group G2, smoke-generating ability - D3. The density of the material can be equal to 50 and 80 kg/m3.

Features of installing sealing tape

Vapor barrier tape for windows, technical specifications which were presented above, must be installed according to the design developed for of this material algorithm. For internal sealing of the seam, a duplicated vapor barrier tape based on aluminum foil is used. For reliable and easy fixation, there are adhesive strips on it, which are located on both sides. The tape should be installed around the entire perimeter of the window, and then covered with slopes that are installed using a dry method.

To install the internal vapor barrier tape at the first stage, it should be cut into separate pieces, the length of which will be equal to the width and length of the window. To these values you need to add 10 cm, which will go to corner connections. The length of the tape is joined with an overlap, the width of which should be approximately 1/2 the width of the material.

Work methodology

Vapor barrier tape for PVC windows, the use of which is described in detail in the article, at the next stage is freed from the protective paper on the side of the duplicated strip. Now the material can be glued to the frame profile. This must be done under tension, and the inner edge of the adhesive layer must coincide with the inner edge of the frame. Protective layer, which is on the butyl rubber coating, should not be removed at this stage.

To ensure that the adhesion of the adhesive strips is not reduced, the structure must be kept open for a shorter period of time, and before gluing, the surface of the window must be wiped with a soft rag or paper napkin.

Conclusion

Vapor barrier tape for windows, the density of which was mentioned above, should be installed in one piece; there should be no breaks on flat surfaces. On final stage you need to install the tape on the window sill, and then assemble the window with sashes.