What thickness for roof insulation?
Roof insulation: why is it so important?
It is the partitions such as the floor, the walls, the doors and the windows that generate the thermal losses of a building. If the totality of the losses caused by these walls is estimated at 75%, a roof alone occupies 30%.
The roof is the part of the house that is most exposed to the outside. If it is not well insulated, it easily lets in heat in summer and cold and humidity in winter. The building will therefore need more energy consumption for heating or ventilation in order to ensure the comfort of the inhabitants over the seasons.
Good thermal insulation of the roof will reduce temperature variations in the dwelling. The energy wasted for heating and ventilation will be reduced and you will be able to save energy. In addition, a good insulation of the roof will protect it from bad weather.
Choosing the right insulation for the roof
Mineral wool, vegetable wool, polyurethane… several insulation materials exist on the market. Each corresponds to an isolation technique.
What thickness of insulation should be provided for the roof?
The thickness of the insulation used is an essential point in the insulation of the roof. For insulation with mineral wool, that is to say glass wool or rock wool, it will be necessary to adopt a thickness of 16 to 20 cm. If you prefer cellulose flake insulation, a layer thickness of 16 to 21 cm is fine.
Insulation of the roof by polyurethane will only require a thickness of 12 to 14 cm since it is one of the best insulation materials. Of course, you can make thicker insulation, because your investment in this will be recouped in the long term.
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