Pasting walls with roll insulation, features of insulation for wallpaper installation, its advantages, disadvantages and technology. Insulation for wallpaper is a special substrate designed to retain heat in the room, level the walls, heat and sound insulation, as well as protect against mold, mildew and condensation. Installation of such material largely solves the problem of the durability of the finish coating of structures. We will tell you how to glue insulation on the walls under the wallpaper in this article.
Features of wall insulation using a wallpaper underlay
One of the types of wall insulation before wallpapering is roll insulation. It is performed using substrates with a thickness of about 8 mm, made on a different basis:
- Expanded polystyrene backing … This material is produced in the form of rolls. To fix it on the surface of the walls, glue or a mixture containing gypsum fine-grained plaster is used. The wallpaper is pasted onto such a substrate using a special polymer-cement glue. The best adhesion to wallpaper has polystyrene foam insulation with an outer layer made of cardboard. Wall insulation with this material is quite effective, since it is reliable, absorbs noise and vibration well, is resistant to moisture and mold formation, but its thermal insulation properties are slightly lower than that of polyethylene substrates, which will be discussed later. The Thermo-Tap insulation has good reviews. The size of its roll is 10x0.5 m, the price is 1 m2 material starts at 500 rubles.
- Polyethylene foam backing … The foam material consists of welded air-filled cells sandwiched between layers of paper. Therefore, no special compound is required to attach the substrate to the base. Wallpaper glue is quite suitable for the entire range of works. Such a substrate has excellent adhesion to any kind of surface. Today, this roll material is the most popular option as thin thermal insulation for walls. It is generally accepted that the Polyf insulation under the wallpaper is considered. It goes on sale in rolls of 0.5x14 m, material thickness - 50 mm, density - 30 kg / m3, thermal conductivity - 0, 039 W / m * K, sound absorption - up to 22 dB, the price of a Polif roll is 1200 rubles.
- Cork backing … It is flawless in terms of ecology, has excellent thermal insulation properties and absorbs sound well. Its presentable appearance eliminates the need for external wallpapering. However, the moisture resistance of such insulation leaves much to be desired, so the cork substrate is often impregnated with moisture-repellent compounds - wax, for example. For ease of fixing on the walls, the back of the cork backing is impregnated with glue. The material is sold in rolls from 5 m2, price 1 m2 - 400 rubles. and more.
- Backing combined with wallpaper … This material is a wallpaper, on the back of which insulation is glued. For the production of such products, aluminum foil, synthetic fiber and the wallpaper themselves are used. The cost of installing this insulation is minimal, but the variety of material does not differ.
Rolled thermal insulation allows repeated gluing of wallpaper to its surface, and at the same time its characteristics remain unchanged. Substrates with a paper outer layer adhere tightly to the walls, and foil ones reflect heat well.
Insulation under the wallpaper can hide only minor flaws in the walls. If it is not possible to level the surface before installing it, it will be better to use cork thermal insulation. It is able to hide almost all flaws, but special glue is required to attach the cork material.
Advantages and disadvantages of wallpaper insulation
Installation of insulation for walls under the wallpaper has a number of undoubted advantages. Let's designate the main ones:
- Insulation keeps heat well in rooms adjacent to unheated enclosed spaces, such as stairwells.
- After the installation of such a coating, the sound insulation of the room increases, the noises behind the walls become inaudible.
- Warming with a backing under the wallpaper is an environmentally friendly insulation, since the material is designed specifically for work inside rooms and does not have foreign odors and toxic secretions.
- If the surface of the walls has small flaws in the form of bumps, spots, chips, they can always be hidden under a soft and elastic insulation for wallpaper. Its paper cover is guaranteed to protect the finish from the appearance of stains, retain its color and pattern.
- The insulation is easily fixed to the surface with ordinary glue for heavy wallpaper and actively resists the formation of condensation. The material is easy to cut, lightweight and has good adhesion to many surfaces.
- Due to the simple installation, roll insulation under the wallpaper can be glued on your own, without attracting unauthorized persons or specialists.
The disadvantage of thermal insulation is the flammability of the coating, it is afraid of open fire and supports its spread during a fire. In addition, the backed wallpaper may dents after impact or strong pressure.
When choosing a roll insulation for wallpaper, one should take into account its technical properties, cost and the possibility of self-installation.
Wall insulation technology for wallpaper
The process of installing a heat-insulating substrate is practically no different from the usual pasting of walls with wallpaper. The difference can only be in the composition of the adhesive. The work is carried out in stages and consists of preparing the surface and materials, priming the walls and applying thermal insulation to them.
Preparing the base for mounting the substrate
Before gluing roll insulation under the wallpaper, it is necessary to remove from the walls the old finish, peeling plaster, dirt, nails protruding to the surface, reinforcement and other unnecessary details. After cleaning, the revealed cracks and potholes should be sealed with cement mortar, and the influx of mortar or concrete should be knocked down with a chisel.
Due to the fact that the insulating substrate under the wallpaper smoothes out minor surface imperfections, it is not required to level it to an ideal state. But if there are drops of more than 5 mm on the walls, it is necessary to apply a thin layer of plaster on them.
After cleaning and leveling the surfaces, they should be primed. This stage of work is of particular importance: in addition to the fact that the primer layer exhibits antiseptic properties, it also increases the adhesion between the wall and the insulating substrate.
Work should be done with a roller or a paint brush, all further actions are performed only after the applied primer has dried. The time for drying it is indicated on the packaging of the material.
Preparation of materials for wall insulation for wallpaper
This stage of work consists in cutting the insulation under the wallpaper into canvases of the desired size and stirring the adhesive. When choosing an adhesive, one should be guided by the type of insulating substrate and its weight. The best option would be to purchase an adhesive mixture with the addition of gypsum fine-grained putty or glue for heavy wallpaper.
To cut the insulation, you need a tape measure, a knife and a ruler. First, you should measure the desired height on the wall, and then roll out a roll of thermal insulation and cut it into canvases of the appropriate length.
The required number of rolls for warming a room is calculated simply: you need to take the quotient of dividing the value of the area of the walls of the room by the value of the area of one rolled out roll of insulation. It is recommended to buy the material with a small margin of 5-10% in case of cutting it at the places where the structures are adjacent.
Before working with glue for insulation under wallpaper, you need to study the instructions attached to it, in which the manufacturer indicates the method of applying the composition, its drying time and the scope of application. It is recommended to use only a substance that is designed to work with the specific type of thermal insulation underlay. Stir the adhesive thoroughly before applying to the surface.
Installation instructions for wallpaper backing
When installing insulation on walls, the air and surface temperature should not be lower than + 10 ° C, the humidity of the environment is allowed no more than 70%. Before work, you should close the windows and doors of the room to avoid drafts, they are completely unacceptable.
The glue is applied with a roller and brush. With the composition, it is necessary to evenly treat the base and the back side of the thermal insulation sheet, which, after holding for 5 minutes, should be carefully applied to the wall in the right place according to the previously applied markings.
Installation of insulation sheets must be carried out vertically from top to bottom without joint-to-joint gaps. To remove air from under the glued thermal insulation, the substrate must be rolled with a roller from the middle to the edges of the sheet. After the canvases are securely fixed to the wall, their joints must be glued with masking tape.
A day after the completion of thermal insulation, the room can be ventilated. Sticking wallpaper to the insulation should be done only after it has completely dried, the time of which is 2-5 days.
Before pasting the walls with finishing material, check the strength of the fixing of the heat-insulating layer. To do this, its small area of 5x5 cm can be cut at the bottom of the wall.
How to glue the backing under the wallpaper - see the video:
If the technology of gluing insulation under the wallpaper is observed, up to 20% of thermal energy can be saved. A roll-up heat insulator is much more effective than wall hangings. In addition, under the windowsills of the apartment, warm wallpapers will relieve you of cold bridges for a long time and preserve the comfort of your home.
