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Why insulate a ceiling?
If we think easily of insulating the walls of a house, it happens that ceiling insulation is not always done. And yet an insulated ceiling prevents heat loss. This also improves the sound insulation of your home.
Insulating a ceiling requires certain skills. It is recommended to entrust this operation to a professional, who will publish an estimate according to the surface to be insulated, and the material chosen.
Ceiling insulation: what criteria to take into account to make the right choice?
First of all, note that the choice of your insulation material will depend on the space available for it: is it a ceiling between two floors or closes the roof space? Indeed, each thermal insulator has its own characteristics.
If you want to insulate a straight ceiling between two floors, it is necessary to take into account the heating of the house. If the room above the ceiling is heated, it is advisable to combine thermal insulation and sound insulation. It is generally a living room. If the room above the ceiling is not heated, only thermal insulation is required.
It is also important to ask yourself if you want to have a high-performance insulation or if you want a more ecological insulation, which is part of a sustainable development approach.
The mineral insulators, very widespread and effective, require a large space because they require a certain thickness to be effective.
Among them, the glass wool (made from recycled sand and glass) and the Rockwool (made from volcanic rocks) have a significant quality / price ratio. Flexible, light and easy to install, they are naturally incombustible and have acoustic qualities. These are insulators often used to improve the fire resistance of buildings.
They are also available in bulk, in rolls or in panels. Allow between 5 and 12 euros per m2 for a thickness of 100 mm.
Glass wool must be applied while wearing a P1 type protective mask, especially in an unventilated room.
Synthetic insulation is made from crude oil / This means that it does not ignite and is non-breathable. However, they require less space to be installed.
You can choose the expanded polystyrene, the most widespread, for its lightness and ease of installation. It can be used both in panels and in bulk depending on the configuration of your ceiling.
As to extruded polystyrene, available only in panels, it will be denser than the previous one and will therefore offer you better quality insulation. It is also more resistant to humidity. On the price side, count between 15 and 20 euros per m2, against 10 to 15 euros for expanded polystyrene.
Finally, for a higher price (around 50 euros per m2), the polyurethane allows better thermal performance. This hard foam is available in panels but can also be sprayed to allow insulation of hard-to-reach parts.
Ecological because made from renewable materials, natural insulation is popular! We find the hemp wool appreciated for its fungicidal and antibacterial qualities, linen wool ideal for regulating the indoor climate, sheep wool which turns out to be a good humidity regulator…
Another possibility: Wood fiber which comes from recycled wood from sustainably managed forests, the main quality of which is to preserve the quality of indoor air.
Finally, also made from recycled materials, the cellulose wadding allows ecological insulation by spreading when the ceiling closes the roof space.
On the price side, natural insulation has a cost equivalent to polystyrene insulation, except sheep wool, more expensive, whose price is closer to polyurethane.