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What are the insulation standards in terms of thickness for walls and roofs for a house in Puy-de-Dôme at 900 m2 altitude? Preferably a glass wool insulation plus plasterboard.

In new construction, there are not properly "standards" of insulation on the roof, but a set of performances to respect to enter the criteria of the RT 2012, the current Thermal Regulation.

In renovation, which must be your case, there is a thermal regulation in the existing, which indicates minimum values ​​of thermal resistance to reach. To receive a tax credit of 30%, the thermal resistance "R" for converted attics (Under-roof insulation must be equal to or greater than 6, regardless of the insulation used, for example, with glass wool, this corresponds to an average thickness of 25 cm of lambda glass wool 36 In your region, which is close to a mountain climate, thicknesses of 35 to 40 cm are advised when space permits.

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