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Insulate your house from the outside: Why? How? 'Or' What ?

Insulate your house from the outside: Why? How? 'Or' What ?



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To save energy, insulating your home is the first thing to do. 90% of the sites are still insulated by interior lining, but the particularly efficient exterior insulation is being developed.

What is that ?

Thermal insulation from the outside consists of lining a facade with an insulator which is then covered with a coating (stone, brick, zinc, wood, tile, slate, etc.) which protects and acts as a finish. This is also called a wall-coat. It is mainly used in rehabilitation because its implementation allows the inhabitants to continue to live in the house during the works.

What advantages?

No need to move during the works, or to redo the decoration of your home afterwards since you don't touch the interior. By insulating from the outside, we do not reduce the living area, unlike the installation of interior lining. The wall-coat protects the building against infiltration, cracks and thermal shock. At the same time, it can completely renovate a damaged facade. In addition, the external insulation eliminates thermal bridges, responsible for 15 to 20% of thermal losses.

Its weak points

In renovations, it costs more than an interior lining because you also have to count the finishing of the facade, but you can benefit from a tax credit. In new construction, on the other hand, the additional cost is very low. In renovations, insulation from the outside, which creates additional thickness, often means that the gable roof has to be spread over, or to move shutters. Finally, this system is not very suitable for single-storey houses for which it is not more efficient than interior insulation.

How much does it cost ?

If you choose an insulator covered with a coating, it will cost you between 60 and 200 euros per m² excluding VAT depending on the technique and finish. For cladding, the price starts at 50 euros per m². Finally for clothing (aluminum, mineral composite material, wafers or briquettes), count from 150 to 180 euros per m², but the rendering will be superb.

Eligible for tax credit and eco PTZ

Until December 31, 2012, insulation works benefit from a 25% tax credit, materials and labor. The work must be carried out by a professional and the thermal resistance must be at least 2.8 K / W per m². This work is also part of the zero-rate eco-loan which allows financing up to 30,000 euros for energy improvement works (at least two types of work) on a main residence built before January 1 1990.