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How to choose without a mistake mineral wool for warming the house

Warming houses becomes of paramount importance, in the light of constantly rising tariffs for energy carriers. The national encyclopedia of construction, ProfiDom.com.ua, has already told you on what criteria you need to choose foam for warming your home. Today we will talk about the rules of the choice of mineral wool
Very often people who want to warm their home, the question arises: which material is better – polystyrene foam or mineral, stone wool? To answer competently, let’s turn to domestic normative documents.

In DBN V.2.6-33: 2008 “Construction of exterior walls with facade insulation. Requirements for design, arrangement and operation “, as well as DBN V.1.1-7-2002” Fire protection. Fire safety of construction projects “, reads as follows:

residential buildings, up to 9 meters high (up to three floors – belong to low-rise buildings) and up to 26.5 meters (up to eight floors – belong to multi-storey buildings) it is permissible to insulate both polystyrene foam and mineral or stone wool;
residential buildings with a height of more than 26.5 meters (nine-storey and above – belong to buildings of elevated floors, altitudes, etc.) are insulated exclusively with mineral or stone wool.
Thus, for the “wet” facade, the choice of material is completely clear:

Private and low-rise buildings are allowed to insulate with expanded polystyrene and mineral: basalt or stone wool;
multi-storeyed, up to 8 floors, inclusively, also – polystyrene and mineral: basalt or stone wool.
All that is above is mineral only: basalt or stone wool.

Mineral wool is of three main varieties:

slag (slag);
glass (glass wool);
stone wool
Slag cotton wool
The raw material for the production of slag wool is the waste from the production of ferrous and ferrous metallurgy, i.e. – blast furnace slag The dimensions of the slag cotton particles are the smallest among the other types of mineral wool. Namely, because of this, slag wool is obtained at the lowest hardness, up to 0.015 MPa (for compression). At the same time, all the thermophysical properties of slag wool are approximately equal to those of other types of mineral wool.

However, slag wool, due to its “dirty foundation” is not strongly recommended for use in insulation of residential buildings. It is good, for example, for use in industrial premises, factories, pipelines, mines, steelmaking mills, etc.

Glass wool
Glass wool, most often, is a product of recycling glass waste or various silicon-containing rocks. The dimensions of glasswool particles vary from 0.5 to 3 mm. Namely, the relatively large amount of glasswool particles causes its high rigidity and strength, in comparison with other types of minvats.

Of the main characteristics of glass wool, we note the following:

coefficient of thermal conductivity 0.036-0.042 W / m * C;
water absorption 1% of the total mass;
Vapor permeability 0.6-0.9 mg / m * h * Pa;
NG flammability group;
density 11-130 kg / m cube.
However, the essential minus of glass wool is, in particular, in large particle sizes: they irritate the skin of the fitters and can get into the upper respiratory tract.

Stone wool
According to the operational characteristics, stone wool, perhaps, is the best of the three varieties minvata. Her, sometimes, is called basalt cotton, as the raw material for her serves the rocks, mostly – basalt. Particle size of basalt cotton wool – average: 0.3-1.5 mm, but with compression, stone wool has a sufficient stiffness: up to 0.035 MPa. This value allows it to be used for vertical warming. Especially since it can withstand short-term heating up to 10 thousand degrees.

At the same time, the hygroscopicity of stone wool is much lower than the hygroscopicity of glass wool, which, moreover, withstands heating up to 400-500 degrees, and, therefore, less resistant to fire. And the vapor permeability of stone wool is much higher, which ensures the best removal of wet steam during wetting.

Of the main characteristics of glass wool, we note the following:

thermal conductivity coefficient 0,04-0,045 W / m * C;
water absorption at full immersion in water no more than 1 kg / m. sq.
Vapor permeability not less than 0.3 mg / m * h * Pa;
NG flammability group;
density from 35 to 225 kg / m. cube.
Thus, the choice of mineral wool should be due to the following criteria:

the thermal conductivity of the minvate λ, the less it is, the better. In this case, this value fluctuates within certain limits, depending on the manufacturer;
the degree of vapor permeability, which is determined by the coefficient of vapor permeability m, and the higher it is, the better: excess water vapor is faster outward;
resistance to heat, fire safety. Everything is clear here without explanation: the higher this indicator, the better.

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