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Saving energy in a house requires excellent insulation, especially in the attic. Indeed, if the heat escapes at the rate of 10% through the floors, 15% through the windows and 25% through the walls, it evaporates by 30% through the roof. The financial investment will be offset by the energy savings achieved. Find more articles on the theme: Quotation insulation work
The different types of insulation
The insulation of the attic can be done from the outside or from the inside, depending on the case. When building a house or repairing a roof, it is advisable to install the insulation material from the outside before laying the tiles. If the roof is already in place, the work becomes more complicated and expensive, since all the tiles will have to be removed. In this case, interior insulation will be preferable. The choice of insulating material is important: it must be effective in both winter and summer. Indeed, if the winter, the objective is to conserve the heat, the summer, on the contrary, it will be to conserve the freshness. The installation of the insulating material is a crucial phase for optimal thermal resistance. Leakage should be avoided so as not to reduce the thermal resistance coefficient.
The choice of insulating material
We distinguish synthetic materials from natural materials. So vegetable and animal wool, cork and wood fiber are natural and perfectly ecological. This is not the case for mineral wools, such as glass wool, produced from silica, and rock wool, obtained from basalt. Remember that the thickness of the insulating material will have an impact on the height of your roof space. Find the right balance between good thermal insulation and an appropriate thickness, which does not reduce your housing volume too much. The ease of installation of the insulation will also be a criterion of choice.
The qualities and costs of materials for insulating roof spaces
Mineral wools, whether glass wool or rock wool are good synthetic insulators, inexpensive (for 100 mm thickness, around 3 to 8 euros per m2). Cotton, hemp and linen are natural materials with good thermal performance and good longevity. They are generally available in rolls, panels or in bulk. They are more expensive (for 100 mm thickness, from 15 to 20 euros per m2). Animal wool, like sheep's wool, has the same characteristics for the same price. Cork and wood fiber are also excellent thermal insulators. Wood fiber is in the form of semi-rigid and rigid panels. It is better suited for insulation of the roof from the outside.