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Interior Insulation: The Complete Guide

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After the roof, the walls of a house are the main source of heat loss in winter and indoor air heating in summer. Exterior noise, exposure to temperature variations and weather conditions… they require good thermal and sound insulation .

The advantages of wall insulation from the inside

In summer as in winter, whether it is raining, windy or sunny, good wall insulation helps prevent cold walls. With great emphasis on the comfort of the room, cold walls are more affected by interior condensation. As soon as it stagnates, it can cause mold and traces of humidity: whatever the exposure of the wall and whatever the exterior conditions, interior insulation can limit the phenomenon.

By installing the insulation indoors, directly on the walls of the house, wall insulation from the inside is easier and less expensive than insulation from the outside. You will not need any permission.

Above all, it allows you to carry out the work yourself, without having to involve a professional, while adapting to suit your projects: rehabilitation of a single room of the home, phasing of a renovation over time ... It's also a good time to renovate a damaged wall.

Wall insulation: techniques and materials

Mineral wools - glass and rock, plant fibers and natural materials, synthetic foams… all materials used in insulation can a priori be installed on walls, indoors. However, they must have a certain rigidity, in order to hold up better and longer, once installed on the wall: plates or rolls are therefore preferred.

Also think about your interior space: insulation from the inside takes up a little space in the living space.

In principle, the thicker the insulation layer, the better it insulates. But thermal conductivity plays a significant role: check the thermal resistance of your material - R- depending on both conductivity and thickness. This reference value corresponds to a certain level of requirement imposed by thermal regulations - RT. It is estimated that for a building labeled "Low consumption building" or "BBC", the minimum thermal resistance must be 4 m2K / W.

The so-called “thin insulators” or “PMR” - thin reflective products - are insufficient to ensure good insulation on their own, they must be combined with other materials.

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