Vapour barrier tape, as well as slope finishing, can improve the quality characteristics of the structure, which prolongs its service 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 according to the 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 designed 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 vapor barrier for joints of different sizes. When choosing a vapor barrier tape, you should consider that its width should be 45 mm more than the installation seam.
General Description
The tapes described for outdoor installation may be made of foam materials, theyrequired for sealing joints 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, the photo of which is presented in the article. The basis of such a material can be butyl rubber, which is designed to seal joints and install on window and door blocks. The product consists of a non-woven fabric, 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 in high humidity, then you should install the material under the dry finish of the slopes, using a metallized variety.
Features of foil vapor barrier tape
Foil hydro-steam and heat-insulating tape is glued to clean, dry, as well as previously degreased surfaces. The material itself is supplied in boxes, the dimensions of which are 420x420x600 mm. It must not be operated at temperatures below +10°C. The tapes are based on foamed polyethylene, which is laminated and metallized with a polypropylene film on one side, while on the other side there is a waterproof adhesive layer that reliably secures the material to concrete, brick, metal, plastic and wooden structures.
Based on a material that consists of a closed cell structure, it has low hygroscopicity and almostdoes not absorb moisture. Elasticity is ensured thanks to polyethylene foam, which guarantees the 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 adhesive layer consists of a water-resistant adhesive, which is created on the basis of synthetic rubber. It has improved adhesion to different materials, which allows the tape to be used without prior surface preparation.
For reference
You can not be afraid that the vapor barrier tape will stick together in a roll, as there is a protective siliconized layer on its surface. Such a steam-hydrothermal insulating mounting tape is used for seams, knots and joints of various building structures, including when installing window blocks, wood products, metal, plastic and concrete.
Material sizes
The thickness of the film is 20 microns, while the length is 15 m, and the width can vary from 90 to 200 mm. 120 and 150 mm are used as intermediate values.
Specifications
Vapour barrier tape for windows has a high coefficient of thermal reflection, which reaches 95%. The coefficient of thermal conductivity is very small, and at 20 ° C it is in the range of 0.038-0.051 W / m ° C. Heat absorption coefficient during the dayreaches 0.48 W/(m2 °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 capacity. In the case of the described vapor barrier film, this parameter is 1.95 kJ / kg ° C.
Under 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 combustibility group G2, smoke-generating ability - D3. The density of the material can be equal to 50 and 80 kg/m3.
Features of sealing tape installation
Vapour 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 duplicated vapor barrier tape based on aluminum foil is used. For reliable and easy fixing, it has adhesive strips, which are located on both sides. The tape must be installed around the entire perimeter of the window, and then closed with 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 andwindow length. To these values must be added 10 cm each, which will go to the corner joints. The length of the tape is overlapped, 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, is released from the protective paper from the side of the duplicated strip at the next stage. The material can now be glued to the frame profile. This must be done in a taut 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 for the adhesion of the adhesive strips not to be reduced, you need to keep the structure open for a shorter amount of time, and before gluing the window surface, you need to wipe it with a soft rag or paper towel.
Conclusion
Vapour barrier tape for windows, the density of which was mentioned above, should be installed in one piece, there should be no gaps on even surfaces. At the final stage, you need to install the tape on the windowsill, and then assemble the window with sashes.
