The thickness of the roof insulation has significant impacts on the performance of the insulation. Whether it is for exterior or interior insulation, it is important to comply with certain standards for better thermal and acoustic insulation. To make a better choice, Toiture Unix explains everything there is to know on the subject.
The choice of roof insulation from the outside
Roof insulation from the outside consists of installing insulation between the roof covering and the frame. There are several techniques to achieve this type of roof insulation such as sarking. Exterior insulation has a reputation for being very effective, especially if you choose the right thickness of roof insulation. It limits thermal bridges, unlike interior insulation. In addition, it is more interesting for preserving the aesthetics of the house. In fact, insulation from the inside, especially with visible frames, offers a somewhat designer result. However, the technique also has some drawbacks. Indeed, since its installation requires great skills, its cost therefore remains higher.
What thickness to choose?
The thickness of the roof insulation depends on several factors including the type of insulation. In fact, the choice of thickness will not be the same for a glass wool insulation and a polyurethane insulation. If you choose mineral wool insulation, you will need a thicker insulation with a thickness of 16 to 20 cm. This is necessary to save more energy. Cork must also have a minimum thickness of 24 cm. However, a layer of 12 to 14 cm will be sufficient for a polyurethane insulation. For cellulose, a thickness of up to 21 cm will be required.
Other elements to take into account when choosing the thickness of the insulation
As mentioned above, the choice of the thickness of the roof insulation must be made according to several elements. In addition to taking into account the type of insulation, it is also necessary to evaluate the thermal conductivity of the material as well as its thermal resistance. First, conductivity indicates the ability to transmit heat. An insulator performs better if it has low thermal conductivity. And in this case, it will not be necessary to use thick insulation. Otherwise, you will have to opt for a rather thick layer. As for the coefficient of thermal resistance (R) it is used to determine the resistance of an insulator against heat and cold. A high coefficient indicates good insulation performance and in general, the ideal is to opt for an insulator with an R greater than 6.
As you can see, choosing the insulation thickness of the roof is not always easy. Several factors and elements will have to be taken into account. If you want to take advantage of