The neighbor insulates the blockhouse with foam-plastic with a gap. Will such insulation work?

Such an example. A neighbor insulates the frame of his building. In order for the tree to retain the ability to breathe, condensation does not accumulate on the walls and the frame does not rot, it leaves a gap between the EPS and the walls (the vapor permeability of the EPS is very low). Mounts EPS on wooden blocks. And with this option, insulation dramatically reduces its effectiveness. The walls will heat the air in front of the insulation and the warm air will rise upward in convection currents - the air will carry away the heat.

If we made a thermal shirt for a log house according to this scheme, then in addition to vertical strips, it was necessary to mount horizontal ones, and quite often - to prevent convection flows. But I saw his work late and my advice is no longer useful. Do you think everything has been done correctly?

A bit of theory:

We know from physics that the less dense the material, the better it is as a heater. Those. heat passes through it worse by heat transfer. Therefore, logically, the most effective insulation should be air (after vacuum - there is no heat transfer).

Those. a ventilated facade (brickwork, curtain facade made of various panels) should be, according to this logic, the warmest without any insulation. Or, for example, hanging a horizontal panel in the ceiling - and it should also work. But, as you know in practice, this is not the case.

There are two more types of heat transfer in nature - radiation (mainly infrared) and convection (flows that carry warm air masses). Because of the second factor, air voids allow air currents to rise along the walls in the system of ventilated facades - to go up.

So it is with radiation. The wall of a house or ceiling radiates in the infrared range and transfers its heat to the surrounding space or by heating nearby materials.

And what then will be the most effective heaters? Those in which all three types of heat transfer will work at a minimum. Rather, where will the combination of these factors with the minimum heat transfer be:

1. Least of all convection flows. Better are those where there will be no large cavities. Sizes in diameter, maximum a few millimeters.
2. Minimal heat transfer of material. Microporous materials or simply with a minimum density. For example, such (ascending heat transfer): penoizol, polyurethane foam, ecowool, basalt wool and a plate.
3. No re-radiation from one area (pore) to another. It depends on the previous point. The lower the level of heat transfer of the insulation, the less heat will be radiated from the outer surface of the insulation.

That is why many do not use the ventilation facade technique, but fill the empty space with insulation. Say the wall won't breathe. She doesn't have to breathe. Ventilation must breathe.

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Photos are taken from open sources, from Yandex. Pictures

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