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The ADEME estimates the potential energy losses of a house at 80%, in the case of poor insulation of the roof, walls, windows and low floors. In order to limit these losses, insulation work will be prioritized according to the parts of the house mentioned above.

Insulate your roof, a priority

The roof and the attic cause the biggest loss of heat in a house. It is indeed 25 à 30% energy that escapes through the roof. Insulation work must therefore focus primarily on this part of the house.

The work will not be the same depending on the nature of the attic (lost, convertible or habitable). It is then possible to insulate the roof from the outside or the inside, techniques each having their advantages and disadvantages.

The walls, the second phase of insulation of a house

In a house, the largest heat loss after the roof comes from the walls. The heat loss here is between 20 to 25%. The second phase of isolation will therefore focus on the partitions.

Insulation can again be performed from the inside or the outside depending on the need. A wall insulation that differs according to the nature of the wall and the material that composes it (single wall, block, concrete, wood frame, etc.).

Insulate your windows, the intermediate step

In the third position of the installations, leaving the most energy of heating, come the windows, with an energetic loss between 10 and 15%.

The thermal performance of a home's glazing depends on several factors, taken into account during the insulation work of the house.

  • Nature of woodwork (wood, PVC, etc.)
  • Glazing in itself (single, double or triple glazing)
  • Quality of the installation of the window (risk of thermal bridge)
  • Closures (shutters, shutters, etc.)

The last step, the insulation of low floors

Finally, the insulation of low floors will complete the work to improve the energy performance of a house. Soils can indeed be responsible for a loss of heat between 7 and 10%.

There are two techniques of low floor insulation, namely:

  • insulation from below, provided there is sufficient height between the floor and the ceiling
  • the insulation from the top, which requires heavy renovation work that can be expensive


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