Warming of a cold attic

Warming of a cold attic

Cold attic - a kind of decoration of the roof of the house. It performs an important function regarding the preservation of heat in the house. And in general, to have an attic in the house is a privilege, because it can fit for different needs of the tenants of the house. But that you do not overpay for heating and could enjoy the warmth in the winter period, you will need to perform the insulation of the floor of the cold attic. Thermal insulation - an integral part of the room. If it is not there, then the building will lose its warmth, and you will waste your money in vain.

What materials are needed to perform the insulation of the attic? Why do this and how? All this you will learn from this article.

What is a cold attic for?

First I want to understand what is so good about a cold loft and why it needs to be insulated. If you go deeper into history, our grandfathers and great-grandfathers built houses that stood for at least 100 years. Along with this, the interior was always warm, and the wooden roof and attic floor remained dry. How so?

Previously, the roofs were often made gable, with a slight bias. So it was no accident. The goal of the builders is to keep the snow on the roof and not crawl from it. What for? It was used as a natural insulation. In addition, the attic was equipped with two or one windows. In the winter they were closed. It so happened that the clamped air inside the attic was a heat insulator. But in the summer, the situation was different. At night, the windows in the attic were kept open to fill the attic with fresh and cool air, and on the hot day the windows were closed. This allowed the air not to heat up.

In winter, snow fell like a blanket over the roof. And even when there were severe frosts in the street, the attic was warm, and the figures below zero did not go down. This contributed to the fact that the house maintained a stable temperature. And the roof slopes were not specially insulated to prevent the snow from melting on them. The rafters were open, they could be inspected and repaired as needed. And that the warm air did not leave the house in the under-roof space, it was enough to perform the insulation of the floor of the attic.

Note! If it is a mansard room, then in this case, both the ceiling and the roof are insulated.

That's why you need to insulate your cold attic. Then the heat from the house will not go out through the ceiling. And as you know, the percentage of heat loss through the roof can be as much as 30%. If you do not want to heat your house for nothing, you should address this issue. It is noteworthy that the insulation of the attic in a private house with their own hands is a real goal. The main thing is to choose a warming material and follow the technology of its laying. And what can I use to insulate the attic of a house?

Requirements for insulation materials

Before considering options for materials for insulation, drawing attention to the requirements that must correspond to the insulation for the attic. In fact, this is a standard set of characteristics that you need to consider. So, here is a list of the main factors:

  1. Low thermal conductivity. This is the main indicator of any insulation. The lower the coefficient, the better the quality of insulation. If you look at the diagram below, you will find out which material has the best indicators.
  2. Light weight. Too it is impossible to overload the floor of the attic. This will affect the whole design and can lead to unpleasant consequences after warming.
  3. Resistance to moisture. No one is immune from the fact that his roof will leak. She is constantly in contact with water. Therefore, the material for insulation should not be afraid of water, without losing its properties after contact with it.
  4. If there is wiring in the attic, the insulation must be resistant to fire.
  5. The durability and safety of the original look is also important if you do not want to make repairs in a few years.

Now we learn what materials for insulation are close to the ideal.

Insulation of the attic with polystyrene foam

The easiest and cheapest way to make your home warmer. The foam has excellent thermal conductivity. In addition, it is absolutely waterproof. Condensate is not terrible for him.

Among these features of the material I want to mention a few more:

  • light weight;
  • availability;
  • simplicity of laying;
  • easy to handle (cut, customized);
  • has a rigid form, holds it;
  • Soundproofed room.

The main disadvantage of polystyrene is its flammability. But, if there is no wiring in the attic, then it's not scary. And protecting it from both sides, you will block access to rodents who love it very much.

The stacking technology is quite simple. Plates of foam can be stacked between the beams. At the same time, it is ensured that it densely enters the space, otherwise the slots will serve as bridges of cold. After laying all the seams are swollen with foam, and the top is laid on the floor covering. The whole process is described in this video.

Warming of the attic with mineral wool

Another popular way. It can be called average in the price category between the foam and the following material, which we will consider. Unlike its "fellow", mineral wool does not burn, as it is made on the basis of molten rocks. This is especially true for basalt wool. Having warmed her loft, you can be sure that it will not break out like a match.

What other advantages of the material for insulation?

  1. Affordable cost.
  2. Light weight.
  3. It is not affected by rodents.
  4. Durability.
  5. Water vapor permeability.
  6. High sound insulation.
  7. Good level of thermal conductivity.
  8. Ecological cleanliness.
  9. Resistance to mold and fungus.
  10. She holds the form well and is easy to work with.

However, the insulation of the floor overlapping the cold attic with mineral wool requires qualitative layers of waterproofing and vapor barrier. The thing is that when wet, it loses its characteristics. It turns out that all efforts can be in vain.

As for the technology of insulation, it is very similar to foam. Rolls or slabs are laid on top of the floor or in the space between the beams. More in this video.

Warming of the attic loft

The most expensive, but high-quality way. If you remember the heat conduction table, you will understand that the PPU is in the first place. Warming of the attic with polyurethane foam guarantees the highest quality of insulation. It is a unique material that is applied to the surface by spraying. To work will require a special unit, which also disperses the composition on the floor of the attic. After application, polyurethane foam increases tens of times, creating a monolithic coating.

Its advantage is that all the cracks, cracks and hard-to-reach places are filled. There are no bridges of cold. In addition, the material has the following characteristics:

  1. Light weight.
  2. Resistance to moisture.
  3. Soundproof properties.
  4. Resistance to fungi and mold.
  5. High quality adhesion to the surface.
  6. Durability.

The downside is that you need to hire trained brigades for work. Do it yourself without the equipment can not. The process of floor attic insulation of the PPU floor can be seen on the video.


As you can see, a lot depends on the choice of material for the attic. Some work you can do on your own, for others you can not do without the help of specialists. But in any case, the result will please you, since you will make the house warmer, while reducing the cost of heating.

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