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Any wall in contact with the outside must be treated. The slightest flaw acts like water in a pierced cup, and reduces the properties of insulation by about 40%. Locate thermal bridges to better combat them.

Diagram of the thermal bridges of the attic

Weaknesses are at the level of the floors of floors, links of the bearing walls...

Insulate attics: look for thermal bridges: bridges

... and at the junction of the facade with the roof.

Insulate attics: look for thermal bridges: thermal

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Video Instruction: Thermal Bridging of an insulated flat roof through the front fascia