The roof of the house when arranging a warm attic or attic needs thermal protection. Most often, when erecting the roof of a private house, it is pitched, this allows you to use the under-roof space and significantly reduce the cost of 1 m2. In the event of thermal protection of pitched roof structures, mineral wool became the most common material. Insulation of the roof with mineral wool inside allows you to achieve excellent thermal protection.
What is mineral wool
Mineral wool is a fairly common material, which is available in several forms. The first classification is based on the origin of the raw materials. There are three types of mineral wool:
- basalt;
- glass;
- slag.
The most commonly used material is basalt fiber. In addition, the separation occurs in the form of insulation. It is produced in two types:
- in rolls;
- hard plates.
Mineral wool slabs are more durable. When warming the roof with your own hands, fixing them is quite simple. Roll material has a low strength, but its mass is lower than that of plates. When the slope of the pitched roof is more than 30 degrees, insulation in rolls is not used. In other cases, it will become a cheaper alternative to stove insulation.
Pros and Cons of Material
Mineral wool roof insulation has the following positive properties:
- high heat-shielding characteristics;
- strength and durability;
- resistance to biological effects (mold, fungus, rodents);
- resistance to fire and high temperatures, which is especially important when ensuring fire safety of a wooden house;
- when insulating from the inside, the plates hold well enough without additional fixing (during operation, the lower crate becomes an additional retaining element);
- thermal protection with mineral wool with your own hands provides free movement of air through the material, this favorably affects the microclimate of the premises of the house.
It must be remembered that the protection of the pitched roof of a house with mineral wool has its own characteristics and disadvantages:
- do-it-yourself installation requires the presence of overalls, gloves and a mask, since particles of fiber, getting on the skin and lungs, cause itching and irritation;
- a sufficiently high degree of water absorption of mineral wool requires the mandatory presence of vapor barrier and waterproofing;
- when warming a house with mineral wool, it is important to remember that it has more weight than, for example, polystyrene foam or polystyrene.
Calculation of the thickness of the insulation and the height of the rafters
When choosing the height of a board or bar for rafters, it is necessary to be guided not only by strength calculations, but also take into account the thickness of the insulation. For central Russia, the thickness of the mineral wool layer for a residential building is within 100-150 mm, for the northern regions, the thickness should be increased.
For example, the required height of the rafters is 150 mm, and the thickness of the insulation is 180 mm. In this case, it will be necessary to increase the height of the rafters so that it allows to completely lay mineral wool between the wooden structures and provide a ventilated layer with a thickness of 5 cm. If necessary, you can use boards of small cross-section laid along the rafters. Such boards are called counter-lattice and allow you to competently perform thermal protection of the roof of the house with your own hands from the inside.
You can perform a full thickness calculation without special skills. To do this, you need to install the application for the PC "Teremok" or use the online version.
The program is a fairly simple calculator that can calculate the required thickness of the insulation or check already accepted.
The technology of insulation of the roof with mineral wool inside
To increase the heat-insulating ability of the roof structure from the inside using mineral wool, it is necessary to prepare the following materials:
- insulation;
- vapor barrier;
- waterproofing;
- wind protection.
Recently, diffusion moisture and wind-proof membranes are often used, which combine two functions.
When doing roof insulation with your own hands, it is not recommended to use a plastic film as a waterproofing or vapor barrier.
To ensure the comfort of the house and its normal operation, the layers of the roofing cake should be arranged in the following order from bottom to top:
- covering the ceiling from the inside of the room;
- lower crate;
- vapor barrier;
- rafter legs;
- insulation between the rafters;
- waterproofing;
- crate;
- roofing.
There are other options for fixing mineral wool material: from the bottom of the rafters from the inside of the room or from above. Such methods are used extremely rarely.
Work on insulation and erection of the roof of the house begins with the installation of the rafter system. After installing the supporting structures, a layer of waterproofing is laid, followed by mineral wool plates mounted from the inside. The next stage of work is the installation of the lower battens, the upper battens and roofing. At the last moment, work is carried out to finish the room from the inside. For this, plasterboard sheets with a thickness of 12.5 mm in two layers are most often used.
Safety precautions
When self-insulating the roof of the house from the inside with mineral wool, the following precautions must be observed:
- the room should be well ventilated;
- cutting tools are used as sharp as possible to reduce the crumbling of mineral fiber;
- Workers must wear gloves and a mask to prevent particles of material from getting on the skin and lungs.
- after completion of work, it is strongly recommended to immediately change clothes, wash your hands thoroughly, and then face with cold water.
When particles of fiber get on the skin, redness and itching appear. To avoid unpleasant sensations, it is enough to observe safety precautions.
The use of mineral wool in construction is very wide. Most often, this material is used for roofs, since it is best placed between the rafters and has many other positive characteristics.
To minvata served for a long time and did not cause problems during operation, it is enough to comply with the installation technology and purchase high-quality material. Several of the most well-known manufacturers are represented on the market, such as Rockwool, Isover, Ursa, Paroc. These materials are used in many types of construction and have managed to prove themselves.