Experienced builders say that the layer of roofing insulation should be laid at the stage of building a house. But if this is not done on time, then the only way out is to insulate the roof from the inside with your own hands.
Why is the presence of a thermal insulation layer in a roofing cake so important? We all know that heated air rises. Only the properly laid insulation can hold it. If there is no thermal insulation, the heat goes unhindered into the sky. Neither double floor nor thick walls of the situation will save. Heat loss through the cold roof reaches 45%.
Roof insulation materials
Glass wool has ceased to be a universal sound and heat insulation layer. Other, more technological and harmless heaters took its place:
- mineral wool – roll and in mats;
- ecowool (bulk fibrous cellulose);
- plates from polyfoam and rigid polyurethane foam;
- sheet penoplex – for roof insulation a special type is used – “Penoplex Roofing”;
- penoizol (liquid foam);
- bulk materials (expanded clay, slag, sawdust, cork). Today, they are not used as often as the filling of such a space is too laborious. But if the roof is curly, then it is easier and more effective to fill it with bends than to cut sheet insulation.
Helpful advice! If it is decided to take mineral wool plates, they should not be compressed and bent before they are laid. In jammed places, cotton will absorb moisture.
It is not enough to choose a thermally conductive material, it is still necessary to properly lay it. Without knowing the technology of warming the roof from the inside with your own hands, you can fill the entire attic space with a heat insulator, and the heat in the house will not increase.
First we go up to the attic and inspect the roof from the inside. It is better to do it after rain, then the defects will be especially noticeable. But the roofing works themselves are carried out on a warm dry day, with a thoroughly dried roof structure.
The progress of the preliminary work:
- we remove all unnecessary from the attic, take out the garbage;
- we clean and sweep over the inner surface of the roof, along with the gables;
- we remove the remains of an old heater;
- we carry out repair of the found damages;
- we estimate the condition of electrical wiring and other communication channels. Best of all, when the power line runs away from the insulation. If the circuit can not be changed, and the wiring will be in the thickness of the thermal insulation layer, then all contacts and connectors must be properly insulated;
- We treat wooden parts of the roof with antiseptic. This will help to maintain the strength of the crates and rafters for a long time.
So, the roofing material is already laid, and access to the rafters from the top is closed. In this case, the works are performed in the reverse order, according to the principle of hemming. Our task is to warm the roof for heated attic (attic).
First, waterproofing is installed on the crate. Usually, ruberoid, asphalt or tar is used for this. The disadvantages of traditional coatings are that their service life is a maximum of 20 years. Modern synthetic materials last 2-3 times longer.
These include Izoplast, Steklobit, TechnoNIKOL, Linokrom, Bikrost. Some use plastic wrap, but this is an economy option. Waterproofing stacked overlap, with the inlet of the edges in the 20-25 cm. Attached to the crate with a construction stapler or staples.
Next is the laying of the insulating layer. It is better to mount insulation plates with rafters so that they are kept naturally. For this, the sheets should be slightly wider than the distance between the rafters. If there is no gap, the heat loss through the roof will be reduced to a minimum.
Achieving tightness in the process of warming the roof from the inside with their own hands, the plates can be glued together. For reliability, arrange additional crate. It will not only hold the stove, but also serve as the basis for the ventilation duct.
Important! In a high-quality roof there are two ventilation gaps. The first – between the slate and roofing felt, the second – between the roofing felt and insulation. And this is not just free space – the air must circulate in it.
Whatever water repellency properties are painted in the instructions for the heater, a vapor barrier is necessary. Steam, which is formed in abundance in our life support system, rises. In summer it evaporates, and in winter it condenses inside the roof. Moisture gradually leads to disrepair and insulation, and the roof structure itself.
Instructions for use Isospan B and its features. Characteristics and features of installation on various surfaces. Other types of vapor barrier Izospan.
It is better to use a professional diffusion film that allows steam to pass in one direction. These include Izospan, Yutafol, Pentaizol. These are two-sided “breathing” materials that provide the optimal microenvironment in the room.
The film is stitched to the rafters, smooth side to the insulation. A rough surface should be directed toward the room. It effectively retains condensate droplets that gradually evaporate. In order not to impede this process, a space of 4-5 cm is left between the ceiling and the film. The vapor barrier strips are laid with an overlap of 12-15 cm, securing them in a horizontal position. For stapling used construction stapler or galvanized nails.
I would also like to warn domestic craftsmen about the dangers of excessive savings. Conducting the insulation of the roof from the inside with their own hands, some hem the roof of the foam, paving as a waterproofing polyethylene. Vapor barrier is either neglected at all, or polyethylene film laminated with a needle roller is laid.
Such a “vapor barrier” layer only creates the effect of a greenhouse. The house becomes damp, the rafters from the condensate begin to rot, there is a smell of mold. In conditions of constant humidity, the life of the foam is sharply reduced. Therefore, it is not recommended to save on thermal insulation materials.
If the attic is arranged only for ventilation, then insulate the attic floor. Here backfilling with slag, expanded clay, loose ecowool is used. If the floor of the attic is a concrete screed, before installing the plates on it it is recommended to install logs between which the insulation will be laid.
Helpful advice! The thickness of the lag should be slightly larger than the thickness of the insulation, so that there is a ventilation gap between it and the waterproofing layer.
A popular type of roof insulation from the inside with their own hands was the foaming of penoisol. For this, the contact surfaces are moistened to increase the adhesion of materials. Then sprayed liquid foam in a thin layer. As soon as Penoizol will increase in volume and set, another layer is applied if necessary. Foam fills all defects, crevices and openings, warming and sealing the ceiling.
Frozen insulation is covered with roofing material and sewn up with plywood or drywall. It will protect it from sunlight and pollution. Penoizol has a long service life, does not crumble and does not shrink.
The technology of laying the roofing pie is the same – foam insulation should be between the layers of waterproofing and vapor barrier. In this case, the vapor barrier film is attached to the supporting elements of the ceiling, after which it is closed with a finishing ceiling. There must be a ventilation gap between the film and the ceiling so that the water has room to evaporate.
Finally. To protect the house from the cold, there are many ways, and one of them is to warm the roof from the inside with your own hands. If desired, any homeowner will be able to perform such work if there is a desire to increase the thermal barrier of his home.