What thickness for efficient interior wall insulation?

Good thermal insulation is important when it comes to the comfort of a home. However, its effectiveness may vary depending on different criteria. Therefore 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 insulation became more and more important. In fact, improving the thermal insulation of a dwelling makes it possible to limit the loss of heat through its various walls and thus reducing the heating bill. Thermal insulation also plays an important role in regards to comfort of accommodation. In fact, a poorly insulated house causes feelings of COLD in winter, despite the warm indoor air, and enter high temperature in summer. This is why RE2020 is now being imposed insulation standards, especially in thickness, from design residences.

Why insulate the wall from the inside?

Therefore it is important to properly insulate your home. It usually goes through the insulation of the roof, because it is responsible for most heat loss. However, the insulation of interior walls is also essential. In fact, the walls contribute to ease housing. If the latter is cold in winter, it causes a sensation torment among the residents, despite the hot indoor air. Walls are also responsible for 20% to 25% of a home’s heat loss.

To insulate the walls, there are two methods: external thermal insulation (ITE) and thermal insulation inside (ITI). If ITE is often recommended by professionals because there are many more capableit’s more dear and may be difficult, if not impossible, to achieve. In fact, there are conditions about condominiumsbut also rules town planning which may interfere with its implementation. In addition, this technique is not recommended for old houses, because it leads to the change of exterior facade. Thermal insulation from the inside is therefore an alternative solution AFFORDABLE and that includes work of limited scope. Within the framework of ITI, the choice of blinding and his thick necessary criteria. In fact, the quality insulation but also the preservation of living space it depends on it.

What is the best insulation for walls?

How to choose an insulator?

When choosing an insulator as part of separating the interior walls, there are several performance indicators consider:

  • The coefficient ofthermal conductivitylambda : it represents the capacity of an insulator to carry heat, that is to say to transmit it or to insulate it. Therefore, the lower this coefficient, the more insulating the material,
  • thermal resistanceR : it shows the insulation’s ability to withstand cold and hot temperatures. So it equates to insulation performance. The higher the resistance, the better the material is made.

Heat resistance is especially related to thick separation. In fact, the higher the resistance, the better the material is made and the thicker the material, the greater the resistance.

Various insulators for interior wall insulation

There are many thermal insulators of different natures and properties. It is below different forms (in bulk, in rolls or even in the form of thermal insulating plates) and can be classified into several categories depending on materials who made them:

  • Synthetic insulation such as polystyrene or polyurethane: often sold in the form of platesthese insulators are inexpensive and have the advantage of being manufactured very insulatingespecially against the cold, while maintaining a flimsy. On the other hand, they do not provide any improvement in terms of sound insulation and their production process polluting.
  • Mineral separation like glass wool or stone wool: in low costthese are very insulators capable, both thermally and acoustically, and offers a wide range of uses. On the other hand they are small firm 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 plates, these insulators capable but also ecological. They also make it possible to fight against noise and contribute to sound insulation. However, this type of insulation is usually more dear than those mentioned above.

wall insulation thickness

What thickness depends on the insulating material?

Thick So insulation plays an important role in this regard displayespecially in the context of the insulation of walls from within. Since the resistance and conductivity do not have the same values ​​depending on the insulating materials concerned, the recommended thickness is also different. In fact, the thermal resistance increases the thickness of the material, and vice versa. So, more thermal conductivitywhich represents the insulating power of a material, the weaker, the more the material capable and therefore can not too thick. Polyurethane, for example, has one of the lowest thermal conductivity on the market. This allows him to be high performancewhile maintaining a flimsy.

the minimum thermal resistance for the inner wall separation is R = 3.7m² K/W. However, this value corresponds to a minimum. So it is good to aim for a value of R = 5 m² K/W to guarantee efficiency insulation, but also in anticipation future regulations. In fact, the environmental regulations always change these thresholds upwards to reduce the environmental impact of housing. Organizations that offer financial assistance for insulation can also be specified basics to respect to benefit from it.

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

  • Synthetic insulation : between 8 cm for polyurethane panels and 12 cm for polystyrene,
  • Mineral separation : between 12 cm for glass wool and 12.5 cm for stone wool,
  • Biosourced insulation : between 14 cm for wood fiber and 15 cm for cellulose wadding.

To insulate the walls from the inside without losing a lot of space, it is therefore better to favor insulators such as polyurethane or the glass wool.

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