Good external insulation significantly reduces heating costs as well as home maintenance. However, home insulation in this way will be effective only if it is well done. Before proceeding with the repair work, it should be well studied how to insulate the walls outside. Then the funds invested in the work and materials will be effectively used and quickly return in the form of savings on heating.
Insulating walls with polystyrene foam (one of the types of foam) - the task is not very difficult, but you must follow certain rules. Mistakes made when performing insulation may turn out to be less effective, and in some cases can lead to serious damage to the facade. To properly insulate walls, it is important to follow certain rules and avoid common mistakes.Below are 11 of the most common rules and errors in the performance of thermal insulation of the building with polystyrene foam.
The surface on which polystyrene plates will be placed must be properly reinforced, it must be stable, flat and dry. It should not contain pollutants that reduce adhesion, such as:
The base must be even - small inequalities (up to 2 cm) are leveled with the help of a leveling mortar. In the case of large irregularities (more than 2 cm), you must use different thickness of polystyrene foam plates, so that they form one plane.
Substrate errors include:
Glue should be applied both on the edge of the plate and on its surface. If glue is applied only along the edge, or only at one point, the plate will bend, and the edges of the plates will be visible on the finished facade.
Proper use of adhesive for foam:
a) on the periphery and points - in this case, the glue should be applied in the form of strips along the edge of the plates with a width of 4-6 cm. and 60% graphite plates.
b) the comb method, which is used only in the case of smooth, plastered surfaces. Glue is applied with a notched trowel to the entire surface of the plate.
Note: The adhesive solution is applied to the surface of the polystyrene plate, and never applied to the substrate.
Glue on each sheet should be placed around the edge and on the surface.
Poor selection of glue or mortar of poor quality can lead to tearing off of the foam plates, along with other layers of the facade. As a rule, it is recommended to use a complete insulation system from the manufacturer - such a system contains all the necessary elements, guaranteed quality, and good coordination of the elements with each other.
It is important that the foam plates be positioned offset by half their length from bottom to top, starting at the corner of the wall.
It is also important to correctly position the plates in the corners. If this is done incorrectly, then thermal bridges occur at the junction of the plates, through which heat losses occur.
In addition, polystyrene panels should also be laid neatly and tightly side by side. Connections should not form straight lines.
The gaps between the polystyrene plates should not be filled with a solution of glue (thermal bridges occur). In order to fill gaps up to 4 mm wide, use polyurethane foam.
Insufficient depth plugs will cause problems. If they are installed too deep, they will destroy the structure of the heat-insulating plate. If they are installed too small, they can create a bulge that will be visible on the surface of the wall.
If you do not use the starting plinth and mesh, the insulation will be exposed to weather conditions and rodents, such as mice, which, when looking for shelter for the winter, often bite into the lower insulation layer and cause damage to it.
The surface of the plates after their placement should be flat. In the presence of irregularities, the surface must be ground to eliminate irregularities. Otherwise they will also appear on the facade. Unfortunately, polishing polystyrene is a time consuming process and takes a lot of time, so it is often forgotten.
In the corners of the window and door openings should not be seams joints plates. In addition, in these places you must use additional diagonal grid bars.
Laying scheme in the corners of window and door openings
The corners of the window and door openings should fall into the central part of the polystyrene plate.
Often, installers do not take into account weather conditions during repairs. It is important that the insulation work is carried out in the appropriate weather - the temperature is not lower than 5 ° С and not higher than 25 ° С. Of course at the time of insulation should not be precipitation. This is important, not for comfortable work, but for the properties of materials that retain their qualities only under certain conditions.For example, at a higher temperature, the adhesive dries quickly before it can glue the foam well onto the substrate.
The use of solar shading is particularly important when laying gray foam. Under the influence of the sun, it heats up quickly, and the result may be the formation of gaps between the plates and peeling them from the substrate.