Foam : size - not the point !

Typical values ​​for material

foam have very high thermal insulation capacity, better than other building materials.Due to its properties, it ensures the long life of buildings under any climatic conditions.Comparing it to the thermal conductivity of other materials, we obtain the following figures: 80 mm foam thickness equivalent to 100 mm of mineral wool, 274 mm wood, 760 mm masonry and concrete in 1720 mm.In addition, it is cheap, so you can use a large amount of material for high-quality performance.

Deciding to use this heater as a finishing material, it is necessary to know which is the thickness of the foam.Its thickness can be any from 20 to 500 millimeters, but all sizes should be multiples of 10 millimeters.However, the order may be issued multiple sheets of 5 millimeters (65 to 45 mm), but the price for them will already be higher, and the price advantage will be lost.The size of the foam sheet may also be any, but the standard size foam follows: length - 1000, 2000 millimeters, width - 1000, 2000 millimeters.

Note!For high-quality thermal insulation foam all options must be selected correctly.

Another important factor - it is density of the material.The foam density is 15, 25 and 35 mark.Weight plays a decisive factor when choosing the thickness, because you can buy a 50 mm thickness and 35, which will be similar to the thickness of 100 mm 25 density.However, more dense sheets price is much higher, so the finish will be more expensive.

Foam: size, how to count?

Outside insulation of the building - a very important event, so you need to calculate the correct foam thickness.The main characteristic of this material is a thermal resistance factor (R).It is a constant value that each region has its own value, depending on the climate.So, Kursk region refers to the temperature zone №1, which is equal to the thermal resistance: R = 2.8 (m2 x K / W).

If you plan to make several layers, the insulation is calculated by the following formula: R = R1 + R2 + R3.The thickness of the layer is calculated as follows: R = p / q, where p - is the thickness in meters to the - thermal conductivity.For example, we calculate the necessary material thickness for the wall thickness in the two bricks.The thickness of the brick is equal to p = 0.51 (m), and its thermal conductivity k = 0.7 (W / m * k).We believe the formula: R (brick) = 0.51 / 0.7 = 0.73 (x m2 / W).

order to achieve the desired target of R = 2.8, take the material density of 25. The formula is: R 25 = R - R bricks, hence R25 = 2.8 - 0.73 = 2.07.Further, according to a special table is calculated, a figure for the value "k", for a density of 25 - it is 0.035 (W / m * C), and we believe: P25 = 2.07 x 0.035 = 0.072 (m).From calculations it turns out that for the wall two bricks necessary to apply the foam density 25, thickness 72 mm.

Important!These calculations are very important for high-quality insulation, so if there is no certainty that all will be able to correctly calculate the cost to see a specialist.

repelling and attracting factors

Now we know that insulation foam dimensions and density is very different, and this significantly affects the quality of the thermal resistance.Why you should choose this material?Consider all of its advantages and disadvantages.

Advantages:

• This is an inexpensive option that fits the economical repair if necessary;
• Very easy installation and handling;
• has a different density, which makes thin dense foam is an excellent way of internal insulation.

Disadvantages:

• very combustible material;But the foam - not the only combustible building material, burning almost everything.
• many toxic substances released during combustion;
• This material often infest the mouse, but that can defend a metal grid.