Before installing the insulation, first of all, drain the walls, and then wait for the wall to dry. It is essential to plan the installation of a VMC to ensure the renewal of the air and to prevent mold and interior condensation. If the moisture problem is not dealt with before isolating, you may make the situation worse. Use an isolation professional who will make a safe diagnosis and advise you best. In the case of the thermal wood cladding this is important now.
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Insulating the interior walls of damp rooms such as the bathroom, the garage, the basement is the first step towards their transformation into real living rooms. This is particularly relevant for an older home that may no longer be suitable for today’s needs. Remember the pavilions of the 60s and 70s with their huge basement. How many owners have never made the most of this space that doubled their living space?
Thanks to the interior insulation, the opportunity is too good to create a suplex, additional bedrooms and bathrooms, or even a studio for rent to students in need of accommodation?
Inner Insulation: The Comparative Insulation
In the 70s and 80s, polystyrene was the preferred material for insulating interior walls. Unfortunately, the disadvantages are many: a poor acoustic performance, fragile and flammable material, toxic emissions of VOCs Volatile Organic Compounds over time and in case of fire, low life.
Even if you live in an old house with thick walls, you may notice that in winter, the temperature is difficult to rise inside. Indeed, the important thing is not the thickness of the walls but the properties of the materials, in particular, their thermal conductivity. Thermal conductivity is the ability to conduct heat. The lower the conductivity the smaller the lambda is, the more insulating the material is.
What Thickness to Choose For Insulation of Interior Walls?
RT2012 imposes minimum thermal resistance thresholds to guarantee the comfort of housing in summer and winter:
Example: You choose glass wool to insulate your garage, so an unheated volume. Glass wool has a thermal conductivity of λ = 0.035 mK. The minimum threshold for walls in contact with unheated volume is 2 m2.K / W. Just multiply 0.035 by 2 to obtain the thickness of the insulation: 0.07 m so 7 cm. Find an insulation company near you.
What Are The Financial Aids For Interior Insulation?
You can benefit from the energy transition tax credit (CITE) of 30%, the eco-loan at zero rates, the VAT at 5.5% and an energy bonus if:
You call on an RGE professional Recognized Guarantor of the Environment for the supply of materials and the installation of the insulation,
The thermal resistance of the chosen material is greater than or equal to 3.7 m2 * K / W.
Some local aid is possible, especially that of the ANAH (National Agency of Habitat). Remember to inquire about your town hall.
The walls represent on average 25% of the thermal losses of a house, just behind the roof 30% see page Well insulate its roof and not counting the windows 13%, which must have performances comparable to those of walls.