Design

Is isolation really essential?

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For insulation of lost and hard to access attics, this fluffed wool offers a lambda of 0.044 W / m.K and a high covering power that limits the amount to use. "Ursa Puls' r 44", Ursa.

Ursa

Before thinking about renewing a heating system, the priority must be to check that the insulation of the housing is in focus. Energy losses, windows, walls, roofs, nothing is neglected in a habitat. Zoom on the possibilities available to you ...

The insulation is not only advantageous, it is a real prerequisite to any good project of energy renovation of a home! Without it, there is no need to consider changing the heating mode. It is vital, however, to proceed correctly, to know where to start and what opportunities are available to you. Retail review ...

Priorities before isolating

Dealing first with the roof and the walls (as well as the windows, if any) is essential. These elements are responsible for half of the energy losses of a dwelling: 25 to 30% of the heat escape through the roof, and 20 to 25% by the walls. Next are ventilation (15 to 20%), windows (10 to 15%), soils (7 to 10%) and thermal bridges (5 to 10%). It is therefore necessary to take into account the habitat in its entirety to act at best.

Intended for the exterior, this complete system acts on the thermal and acoustic insulation. It also offers a perfect airtightness. "Integra Réno", Isover.

Isover

Insulate from the inside or insulate from the outside

In renovation, it is possible to proceed in two ways: insulation from the inside (ITI) or insulation from the outside (ITE). The first solution is the most common. It is also the easiest to implement, and the cheapest. Its major disadvantage is to take up space on the living space. But by favoring an insulation that combines a good thickness / thermal performance ratio, it is possible to limit the loss. Insulating from the outside gives excellent results. Of course, the approach is more complex than for insulation from the inside, but it does not lack arguments. It allows to isolate without causing discomfort for the inhabitants. Moreover, it does not encroach on the living space and does not induce fi nishing or interior decoration work. Attention: we will not reserve less insulation from the outside to a heavy renovation project. Do not underestimate the importance of good ventilation in an insulation project, both inside and outside insulation. You will thus preserve the housing of potential degradations due to the condensation, for example, and allow an adequate renewal of the ambient air.

Choosing the right insulators

To make the right choices, it is important to know how to identify the best products and to know, for this purpose, the coefficients that will serve you.

Thermal conductivity (lambda symbol) is the ability of the material to transmit heat. The lower the lambda, the more insulating material.

Thermal resistance (symbol R, in m², K / W): it is a function of the conductivity and the thickness of the insulation (surface thermal resistance). The thicker the material and the lambda, the higher the thermal resistance. In other words, the higher R is, the more insulating the material is.

The coefficient U (in W / m², K): it symbolizes thermal losses. The weaker it is, the more insulating the wall.

For insulation of lost and hard to access attics, this fluffed wool offers a lambda of 0.044 W / m.K and a high covering power that limits the amount to use. "Ursa Puls' r 44", Ursa.

Ursa

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