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To isolate a house from 1786 (white stone walls of 60 cm) I ask myself questions:
- Walls: can I put placo + glass wool on peripheral walls? if not, what to put?
- Soil: can I put panels Efisol type + screed? if not, what to put?
All these questions because on the net we read a lot about the walls that must breathe... FYI, no moisture on the walls.

The debate on insulation is indeed very open...
- The question of soil insulation is the simplest: a insulation covered with a screed is a good solution. The laying of the insulation may be preceded by the application of a polyane film, in order to avoid any rise in humidity.
- The question of walls is more complex. Proponents of insulation believe that a stone wall, even 60 cm thick, isolates practically nothing. In reality, a thick wall partially compensates for a reduced insulation power, by increased inertia capabilities, capacities that are not recognized by the normative bodies.
Clearly, with a thick uninsulated wall, the heating is relatively long, but then the walls store the heat stored. As proof, old houses with rough walls, well insulated at the level of the roof and joinery, are not particularly energy-consuming.
However, this operation, because of inertia, is more suitable for permanent use than a second home.
Insulate the walls from the inside remains possible, but it reduces in part the inertia capabilities of the wall, useful in winter, but also in summer to maintain a certain freshness. Even if the walls are not damp, avoid glued doublings, and prefer the metal frame lining, mounted independently of the walls, a blade of air is maintained between the insulation and the wall.

On the same topic

  • Questions answers
    • Which insulation to realize at 900 m altitude?
    • Choose your thermal insulation solution for the facade
    • How to insulate an old house?
  • DIY tips
    • Redo the joints of an old facade

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Video Instruction: How to Choose and Use Insulation - This Old House