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Insulation from the outside thanks to a coating support

Coated substrate insulation is a technique that is used to insulate walls from the outside. And that says isolation from the outside, says conservation of the living space within the house. A comfort made possible by the addition of insulation directly on the facade. This, of course, requires obtaining prior authorization.


What is the insulation from the outside thanks to a coating support?

The principle of an insulation like this is to apply a layer of insulation directly on the wall so as to increase the thermal performance of the structure. This application is done on the outer face of the wall, which allows not to break the thermal inertia of it unlike what occurs with insulation from the inside.

Insulation from the outside thanks to a plaster support

With insulation by plaster support, the insulation can be fixed in several different ways. It is either mechanically fixed to the wall, glued with adhesive mortar, or both glued and mechanically fastened. This insulation is then covered by a coating on which rests a fiberglass reinforcement mesh which, in turn, serves as a support for what is called a base layer. The role of the base layer is to smooth the surface and make it ready to receive the finishing coating that will close the realization, usually plaster.

The gain in thermal performance thanks to the insulation technique by coating support:

The thermal performances obtained thanks to the external insulation by coating support are quite advantageous. And the more you increase the insulation thickness, the more successful the operation will be. A cause-and-effect relationship that may seem simplistic at first glance, but in fact proves to be very significant. Indeed, the overall price of the work can be seen as a starting bet, with a linear surcharge that will depend on the thickness of the insulation. From there, the greater the thickness, the less the fixed costs of the work will weigh in the price / insulation ratio earned.

Of course, the nature of the original wall also comes into play. Thus, a hollow brick wall will offer much better results than a brick wall. This, thanks in large part to its honeycomb structure.

The different materials suitable for insulation from the outside with plaster support:

Different materials suitable for external insulation with plaster support

Naturally, in order for the assembly to be effective and durable over time, it is essential to choose an insulation that meets outdoor usage and is hydrophobic in nature, such as compressed rockwool, expanded polystyrene, fibragglos panels or even wood fiber panels.

The use of expanded polystyrene is common for this type of work because it is inexpensive and easy to install. However, it is a material a little softer than others and quite fragile to shocks. It can therefore occur deformations in case of impacts. It is logically inadvisable to use it for houses along busy roads. However, if you live in a peaceful neighborhood, the danger is quite small. It will be necessary to take care, if necessary, to reinforce the angles for more safety.

Finally, to avoid the creation of thermal bridges punctual with the technique of mechanical fastening of the insulation, it is better to use fixing dowels in plastics and not in metal. This, in order not to create flaws and to start the effectiveness of the insulation that you are carrying out for lack of adapted material.


Video Instruction: How to fix to an insulated wall