The vapor barrier tape, as well as the finish of the slopes, is able to improve the quality characteristics of the structure, which extends its life. On sale you can find such 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 by temperature characteristics during operation.
The first variety is suitable for the summer period and can be used in the temperature range from +5 to + 35 ° C, while products intended for winter are able to undergo temperatures below zero degrees. The width of such a strip can vary depending on the task, which allows it to provide vapor barrier seams of different sizes. When choosing a vapor barrier tape, you should consider that its width should be 45 mm larger than the mounting joint.
general description
The described tapes for external installation can consist of foam materials, they are required for sealing joints and can be used in conjunction with a plaster solution, which increases the vapor barrier characteristics. On sale there is a vapor barrier tape for windows, characteristics, a photo of which are presented in the article. The basis of such a material may be butyl rubber, which is intended for sealing joints and installation on window and door blocks. The product consists of a non-woven fabric, is primed during installation, is 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, you should install the material under the dry finish of the slopes using a metallized variety.
Characteristics of foil vapor barrier tape
Foiled hydro-steam and heat-insulating tape is glued to cleaned dry, as well as previously degreased surfaces. The material itself is supplied in boxes, the dimensions of which are 420x420x600 mm. It should not be operated at temperatures below + 10 ° C. The tapes are based on foamed polyethylene, which is laminated and metallized on one side with a polypropylene film, while on the other there is a waterproof adhesive layer that reliably provides fastening of the material on 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 joints with varying degrees of unevenness. High mechanical strength was achieved due to the presence of a 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 water-resistant glue, which is created on the basis of synthetic rubber. It has improved adhesion to different materials, which allows you to use the tape without preliminary surface preparation.
For reference
You can not be afraid that the vapor barrier tape sticks together in a roll, since there is a protective siliconized layer on its surface. Such a steam and hydrothermal insulation mounting tape is used for joints, nodes and joints of various building structures, including when installing window blocks, wood, metal, plastic and concrete products.
Material sizes
The film thickness is 20 μm, while the length is 15 m, and the width can vary from 90 to 200 mm. The intermediate values are 120 and 150 mm.
Specifications
The vapor barrier tape for windows has a high coefficient of thermal reflection, which reaches 95%. The thermal conductivity is very small, and at 20 ° C it is in the range of 0.038-0.051 W / m ° C. The coefficient of heat absorption during the day reaches the level of 0.48 W / (m 2 ° C). The thermal resistance is 0.031 ° C / W, which is true for one millimeter of thickness. Professionals are sometimes also interested in such a characteristic as specific heat. In the case of the described vapor barrier film, 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. The vapor barrier tape for windows also has another significant advantage, which is expressed in the ability to absorb extraneous noise. Thus, sound absorption is 32 dB. The material belongs to the combustibility group G2, smoke generating ability - D3. The density of the material can be equal to 50 and 80 kg / m 3 .
Features of installing sealing tape
The vapor barrier tape for windows, the technical characteristics of which were presented above, should be installed according to the algorithm developed for this material. For internal sealing of the seam, a double 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 closed by slopes, which are installed in a dry way.
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 this value you need to add 10 cm, which will go to the corner joints. The tape overlaps along the length of the overlap, the width of which should be approximately 1/2 the width of the material.
Methodology
The vapor barrier tape for PVC windows, the application of which is described in detail in the article, is removed from the protective paper from the side of the duplicated strip in the next step. Now the material can be glued to the frame profile. This must be done in a tense state, and the inner edge of the adhesive layer must coincide with the inner edge of the frame. The protective layer that is on the butyl rubber coating should not be removed at this stage.
In order to prevent adhesion of the adhesive strips, it is necessary to keep the structure open for less time, and before gluing, wipe the window surface with a soft rag or paper towel.
Conclusion
The vapor barrier tape for windows, the density of which was mentioned above, should be installed in one piece, there should not be gaps on smooth surfaces. At the final stage, you need to install the tape on the windowsill, and then assemble the window with the wings.