Technology of insulation of walls with foam plastic from the outside. Insulation of walls from outside with foam: reviews

Today it became very important to use foam plastic as an external insulation. Indeed, it can be said with great certainty that this is a good way to keep the heat in the room. Let's consider what is the technology of insulation of walls with polystyrene from the outside, as well as its main stages and nuances. Believe me, there really is something to talk about.

Why is it necessary, or What will it give?

Quite a legitimate question, because hardly anyone wants to spend an impressive amount of money, not getting the proper result. The fact is that any technology of insulation of walls with foam plastic from the outside has several undeniable advantages. Firstly, in the heating season you save a significant amount of fuel, and in the summer time, less costs for air conditioning. Secondly, unlike internal insulation, the area of rooms does not decrease, and this is very important, especially if it is a small house or apartment. The so-called "dew point" will be behind the heater. This completely solves the problem of freezing the wall, and also prevents its rapid destruction due to moisture. It is worthwhile to draw your attention to the fact that this is not all the advantages of this method of warming. The rest will be considered a little later.

Material selection

The first thing to do is pick the right foam. It would seem that it could be easier? But not everything is so easy, as there are some nuances here. It is necessary to choose the correct density of the material, most often a dense foam plastic grade C-25 (25 kg / m ³ ). But you will probably ask why the choice falls on this brand, because the lower the density, the better the thermal insulation properties. That's right, but a large number of closed cells in the foam structure leads to the fact that convection of air and ultraviolet light is practically completely eliminated, and this is what is required from a good heat insulator. If you take a material of lower density, for example 10-15 kg / m ³ , then the plaster of such a surface becomes a problem, and any mechanical impact will break the integrity of the sheet. For a cubic meter of S-25 will have to give about 2,000 rubles.

Insulation of walls from outside with foam: surface preparation

Before starting work, it is necessary to try to prepare the surface as much as possible. To begin with, you need to level the wall, or at least try to do it. Any cavities and protuberances will contribute to a loose fit of the foam, and as a result, air and moisture can not be avoided. Of course, it is very difficult to completely avoid unevenness, but they should not be more than 1-2 centimeters. Remember, the smaller the rough surface, the better will be the grip of the material. That is why the presence of an old paint is unacceptable. If there is one, it must be cleaned and the surface primed. As practice shows, priming walls is almost always necessary. In any case, it does not hurt, but will only strengthen the wall and improve the bond with the glue. After this, it is possible to begin the insulation of the walls from outside with foam plastic. Let's see what's what.

Preparation and fixing of a heater

Usually novice masters use glue, in principle, the result will be normal. But where better for these purposes dowel-umbrellas approach. On the horizon at the bottom of the wall you need to mount the starting profile. On the perimeter of the sheet at several points, glue is applied. By the way, where there are grooves, you can apply a little more glue, which slightly compensates for the cavities. Then the sheet is simply pressed against the wall, and we proceed to work with the next one. In principle, this is a fairly simple scheme that allows you to make high-quality insulation of the walls of the house from the outside with polystyrene foam. It must always be remembered that the horizontal rows are glued with a vertical offset of the seams, which allows you to distribute the load evenly over the lower row. In a few days, when the glue grabs, you can fasten on dowels-umbrellas (fungi). If there are slots more than 5 mm, they need to be filled with foam.

Insulation of walls from outside with foam plastic: reviews and recommendations of consumers

Before using this method, it is necessary to verify its effectiveness. It is best to do this by listening to the comments of other people who have made such warming. Such a source is the most informative and at the same time completely free. As practice shows, the insulation of the walls from the outside with polystyrene foam, reviews about which are mostly positive, really makes sense. According to consumers, the cost of electricity is reduced by about 15%, and gas - by more than 20%. These are very good figures. In a few years, the purchase of polystyrene foam will pay off completely. Nevertheless, professionals recommend careful consideration of this issue and pay attention to important details. For example, you do not need to buy sheets of the same thickness, since this makes no sense. It is due to the fact that the corners should have a larger layer, like the southern wall. In addition, users recommend not buying a brand of polystyrene below C-20 (20kg / m ³ ), as it is easily deformed, and with it more problems.

Do we need a reinforcing mesh?

A very strange question, the answer to which can only be one - of course, yes. The reason is that without such an important element, cracks will soon appear, and it is possible that the sheets will float. As a basis for the plaster should be a glass mesh. Preferred density is not less than 150-160 g / m ² . It is best to fasten it on the adhesive (cement base). The last is applied by the site meter per meter. Next, we need a wide spatula, with which we drown the reinforcing mesh in the glue. Many recommend applying one more layer of glue from above for greater reliability. Periodically check how smooth the surface. It is desirable that the horizontal stripes are overlapped at least 7-10 cm, and the corners of the facade are reinforced with a perforated corner.

A bit about finishing

In principle, the technology of insulation of walls with polystyrene from the outside is fully considered. All that remains to be done is to take care of the exterior finish. Of course, this is a private matter for everyone, but the painted facade looks much better than the untreated one. Do not forget to primer the surface before painting. It can be said that the insulation of wooden walls with polystyrene foam is executed externally in the same way as concrete ones, with a few minor differences. First, thin-layer plaster will be needed to protect the room from fire. Secondly, it is necessary to provide an air layer, which eliminates the appearance of condensation between the wall and the heater. Do not forget that ideally a sheet of foam should not have a thickness of more than 50 mm.

Conclusion

So we discussed with you the question of interest. As you can see, the technology of insulation of walls with polystyrene from the outside (with your own hands) is quite simple. If there is a desire, then all the work can be done literally in a few days, even without any experience in construction. The main thing is not to rush, but also to perform all the stages qualitatively. As a result, you will get a good thermal insulation, due to which you can save some of the funds for heating the room in cold weather. Of course, the final decision to take you, but we can say with great confidence that polystyrene is not only an inexpensive insulation, but also quite effective. In addition, the facade of the building will look more bright and attractive, since you have the opportunity to use such a paint that you want.