Thermal calculation of the roof frame house with his own hands. Calculating the insulation thickness

During the design of the house is one of the aspects of the roof. By selecting the width of the trusses are often based only on the desired thickness of insulation. This is totally wrong, because of the load on the roof is much higher than the value of that section of the rafters allows observe, for example, 150 mm.

Calculation section rafters.

In my case, the slope of the roof was selected to 30 degrees and being aware of SNIP 2.01.07-85 "Loads and effects" in 2008, picking up the cross section of the rafters, I stopped on 150 mm.

Thermal calculation of roof slab.

In parallel with the selection of cross-sections occur Thermal calculation of the building wall.

Professionals use the SP 50.13330.2012 Thermal protection of buildings and structures, actualized edition.

But you can also use the online calculator, which entered the data about the material and its thickness.

The program counts the heat resistance, the point is Ross and outputs a schedule by which to determine the conditions under which the inner surface of the insulation layer and stay dry.

As a coating, I chose shingles (onduvilla) and cake roofing slab was as follows:

• Shingles (sheet);
• Vented gap 50 mm;
• hydroprotection;
• Glass wool 150 mm;
• vapor-proof membrane;
•  OSB-6 mm.

In my case Thermal calculation showed a good result for a frame house R = 3, m2 73 · K / W

Installing insulation.

Mineral wool density is set to a small mezhstropilnoe space and is mounted with a special adhesive. In this case it was used the high-density glass wool, however turned out to do without glue.

Rooms'OSB-3.

When all the elements are mounted is sewn OSB-3, 6 mm sufficiently to solidify truss connection and impart sufficient rigidity.

Then you can apply lime plaster, proarmirovat joints of panels and paint. It is worth remembering that for breathable materials should be used only on the compositions of lime binders.

See also:

Sewage to give: the easiest option

Installation of roller blinds without drilling (forces of one young lady, disjointed with a drill)

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