What thickness for efficient insulation of interior walls?

What thickness for efficient insulation of interior walls?

Good thermal insulation is essential when it comes to the comfort of a home. However, its effectiveness may vary based on different criteria. For this reason, it is important to know which insulation to choose and what thickness to use depending on the type of wall to be insulated.

As energy prices continue to rise, thermal isolation becomes more and more important. In fact, improving the thermal insulation of a home makes it possible to limit the heat losses by its different walls and thus reduce the heating bill. Thermal insulation also plays an important role with regard to accommodation comfort. In fact, a poorly insulated house will provoke feelings of cold in winter, despite the warm air inside, and will let in high temperatures in summer. That is why RE2020 now imposes isolation criteria, particularly in terms of thickness, from the design households

Why insulate a wall from the inside?

Therefore, it is important to properly insulate your home. This usually goes through the insulation of the ceiling, since it is responsible for the most heat loss. However, the isolation of Interior walls is also essential. In fact, the walls contribute to the comfort accommodation. When the latter are cold in winter, they cause a sensation discomfort among residents, despite the hot air inside. Walls are also responsible for 20% to 25% of heat loss in a house.

To insulate walls, there are two techniques: external thermal insulation (ITE) and internal thermal insulation (ITI). If professionals usually recommend ITE because more efficientis however more expensive and can be difficult, if not impossible, to achieve. In fact, there are conditions relating to the condosbut also rules Town planning that can make implementation difficult. Also, this technique is not recommended for older houses, because it leads to the modification of the Exterior facade. Thermal insulation from the inside is therefore a better alternative solution. affordable and that implies a smaller work. Within the framework of the ITI, the choice of isolation and his thickness are essential criteria. In fact, the quality isolation, but also the conservation of vital space it depends on it.

What is the best insulation for walls?

How to choose an insulator?

To choose an insulator as part of interior wall insulation, there are several performance indicators to take into account:

  • The coefficient ofThermal conductivitylambda : represents the capacity of an insulator to conduct heat, that is, let it pass or isolate it. Thus, the lower this coefficient, the more insulating the material is,
  • thermal resistanceR : indicates the insulation’s ability to withstand both hot and cold temperatures. Therefore, it corresponds to the insulation performance. The higher the strength, the better the performance of the material.

Thermal resistance is particularly related to thickness isolation. In fact, the higher the resistance, the better the material will behave and the thicker the material, the higher the resistance.

The different insulators for the insulation of interior walls

There are many thermal insulators of different nature and properties. These are available under different ways (in bulk, in rolls or even in the form of thermal insulation plates) and can be classified into various categories according to materials who compose them:

  • synthetic insulation such as polystyrene or polyurethane: often sold in the form of platesThese insulators are inexpensive and have the advantage of being very insulatingespecially against the cold, maintaining a slim. On the other hand, they do not provide any improvement in terms of acoustic insulation and their production process is polluting.
  • mineral insulation such as glass wool or rock wool: for low costthese insulators are very efficient, both thermally and acoustically, and offer a wide range of uses. On the other hand they are less durable and effective against humidity.
  • natural insulators such as wood wool, hemp, cellulose wadding or cork: sold in bulk or in the form of panels or boards, these insulators are efficient but also ecological. They also make it possible to combat noise and contribute to the acoustic isolation. However, this type of insulation is generally more expensive than those mentioned above.

wall insulation thickness

What thickness depending on the insulating material?

Thickness Therefore, insulation plays an important role with regard to its performanceparticularly in the context of the isolation of walls from inside. Since resistance and conductivity do not have the same values ​​depending on the insulating materials in question, the recommended thickness also varies. In fact, the thermal resistance increases with the thickness of the material and vice versa. So the more Thermal conductivitywhich represents the insulating power of a material, it is weaker the more the material efficient and therefore can be less thick. Polyurethane, for example, has one of the lowest thermal conductivities on the market. This allows you to be high performanceholding a slim.

the minimum thermal resistance for interior wall insulation R = 3.7 m²K/W. However, this value corresponds to a minimum. Therefore, it is advisable to aim for a value R = 5 m² K/W to guarantee efficiency isolation, but also to anticipate future regulations. In fact, the environmental regulations regularly review these thresholds upwards to reduce the environmental impact of housing. Organizations that offer financial assistance for insulation can also establish thresholds respect in order to benefit from it.

Thus, for a thermal resistance of 3.7 m² K/W, recommended minimum thickness for each material varies:

  • synthetic insulation : between 8 cm for polyurethane panels and 12 cm for polystyrene,
  • mineral insulation : between 12 cm for glass wool and 12.5 cm for rock wool,
  • Biologically derived insulation : between 14 cm for wood fiber and 15 cm for cellulose wadding.

To insulate the walls from the inside without losing too much space, it is better to opt for insulators such as polyurethane or the glass wool.

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