Insulating walls from the outside : how to do it ? What is the cost?

Insulating your house from the outside is a commonly applied technique because it allows you toincrease considerably home comfort while generating energy savings. This is due to the fact that this type of insulation is perfect for eliminate thermal bridges while making the more aesthetic building. There are different solutions to insulate your walls from the outside. Admittedly, this represents a cost, but we can thus achieve a return on investment. Obviously, this is the type of work that cannot be improvised. Unless you are an expert in DIY, it is better to entrust this site to a professional insulation.

External Thermal Insulation (ITE): what interest?

When you opt for this insulation technique, it allows you to wrap the walls of a house or other building with insulation and then several layers of protective facings. This eliminates the thermal bridges that promote the loss of interior heat (or coolness during the summer), and increases the inertia of the walls. This is very interesting because we gain financially but also in comfort. In fact, after having insulated your home in this way, you spend less money on heating and air conditioning since in winter, it is less cold in the house and in summer, it is less hot there.

This presentsother advantages and not least. Throughout the work, the family can continue to live on the premises since the site does not impact the living space. And as for the interior surface of the house, it does not vary one iota, which is not the case when the walls are insulated from the inside. In addition, this type of insulation is an excellent solution for rénover sa façade and the facings used bring a real cachet to construction.

Possible solutions for exterior wall insulation

There are different solutions for installing thermal insulation from the outside.

Insulation under cladding

The insulation used is hemp wool (vegetable wool) which has undergone a flame retardant treatment, mineral wool or expanded polystyrene.

After laying the insulation on the exterior wall, we come to lay a protective frame. It can be a siding with horizontal, vertical or oblique blades, which one chooses according to his architectural tastes. The materials are for example zinc, stone, wood, metal, PVC and fiber cement. All colors are possible, as long as you respect the requirements of your sector.

Insulation under plaster

The insulation that can be used for this technique is Wood fiberthe PSE (expanded polystyrene) or glass wool. Once the insulation is in place, it remains to apply a coating, either organic or mineral.

Insulation under cover

For this type of ITE, the insulators that can be chosen are mineral wool, pure polyurethane, expanded polystyrene, extruded polystyrene. The technique consists of placing theinsulation already glued to the facing platesthis assembly having been made by machining (prefabricated).

Another very close way is called the clothing. Here again, manufactured elements are used.

Insulating your home from the outside: what cost?

The price of exterior wall insulation is extremely variable since it depends:

  • The type of insulation (natural, mineral, synthetic) partly chosen according to the local climate,
  • the quality of the insulation,
  • The thickness of the chosen insulation,
  • The type of facing,
  • The number of walls concerned (facade alone or all the walls),
  • Of the area to be insulated,
  • Difficulty of access to the facade and other walls, namely that a high house requires the installation of scaffolding, so it costs more than to insulate a one-storey house from the outside,
  • From the geographical area,
  • From the craftsman.

The cost of ITE can be obtained through a online comparator. For information, it is necessary to count between 60 and 100 € including tax per m². This includes the cost of the insulation but also the installation. Thus, according to the Anah (National Housing Agency), insulate from the outside only the façade of a one-storey house located in the Paris region requires a budget of approximately 2 500 € whereas it would cost between €8,000 and €12,000 to have all of its walls insulated.

In order to encourage owners to insulate their building, the State pays financial help under conditions, either in the form of tax creditor in the form of premium energy. Why then deprive yourself of a comfortable habitat and what is more, of enhance your heritage ? For this, it is obviously necessary to respect all the regulatory requirements in force, namely RT2012 and even now, RT2020.

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