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I have a chalet that I renovate at 1800m altitude. There is a room that is 75m ² and I would like to put a floor heating low temperature and ask over a wooden floor nailed on cleats. Is it possible?

The purpose of underfloor heating is to heat the room, not the floor. A solid wood floor of 22 mm, placed on joists, will oppose a significant thermal resistance. The efficiency of the heating system will be reduced, and the floor may be deformed under the effect of heat: this technique is therefore prohibited by the regulations (DTU).
To find a "mountain floor" aspect, one solution would be to provide underfloor heating, conventionally embedded in a screed, then to glue (with suitable glues) on this screed a thin floor (14 mm maximum), of rustic appearance, in stable species (avoid beech, birch, ash...), limiting the length and the width of the blades (they must not exceed 90 mm of width, even 130 mm at the maximum for the oak slats). This provision is in accordance with DTU 51.2.

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