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Which thermal insulation to choose to renovate the insulation of attics?

Comparative of attic insulation machines lost. The main insulation of attic used, in panels, in bulk, to blow or to spread. Comparison of thicknesses, installation methods and thermal resistances of the main attic insulation materials lost.

How to isolate the attic floors lost in renovation?

There are 5 methods of implementation for the insulation of lost roofs. The spreading of insulating fibers in bulk, the placement of insulating panels, the implementation of insulation in rolls, the blowing of loose insulation, and the projection of polyurethane foam.

Insulation of Lost Combls                                    

This is the first method that allow you to remake the insulation of your attic oneself. No tax credit under these conditions. It will be possible to ensure this implementation with the following materials, for which the thickness will depend on the thermal resistance sought for the tax credit:

 Cellulose wadding

The tissue paper, thermal insulation bio-based, comes from the recycling of paper / newspapers. This thermal insulating available in manual placement offering lambda λ of 0.037 W / mK to 0.040 W / mK , will demand a thickness of about 25 cms for λ of 0.037,  and 28 cms for λ of 0.040,  in order to achieve the thermal resistance  R ≥7 m2 .K / W  for the best of them. A newcomer in bio – sourced wadding insulation, cardboard wadding insulation, with the same thermal performance, is similar to cellulose wadding.

Recycled cotton wool insulation

Also coming from the circular economy, recycled cotton wool spread manually over a thickness of 30 cm for a lambda of 0.042 W / mK.  Note that if manual spreading is intrinsically possible for this type of insulation, its implementation is recommended primarily with cool insulation machines to blow.

Which organic insulation sourced for the insulation of its attics?

Organic insulators sourced from the circular or local economy benefit from consumer support for these same arguments. The natural nature and the low gray energy consumption required for the development of these materials allow them to gain market share each year, despite their higher cost than historical insulators.

Glass wool insulation

The glass wool, inorganic thermal insulation from partially recycling, displays a lambda of 0.032 W / Mk to 0.042 W / Mk, giving this isolating a R≥7 m2 .K / W for an implementation of thickness 22 cms. It can be used for Installation in the attic by fiberglass insulation blowers’ machines to blow. The density of glass wool is interesting for light floors. This material is available for manual and blow spreading.

Rock wool insulation

The rock wool is available in manual or mechanical application, providing a lambda 0.034 W / Mk to 0.044 W / mK. Relatively inexpensive, its thermal resistance is certified up to R≥15 m2 .K / W, with no problem of weight for plasterboard ceilings. Spreading is carried out by cool insulation blowing machines, with the same precautions concerning electric spots and the management of VMC Simple Flux ducts.

Glass wool or Rockwool for thermal insulation in mineral wool

The thicknesses will be practically the same for the desired thermal resistance. The difference will be made in the price of the renovation of the insulation of his attics lost, and his attachment to the nature of the material used. The big advantage of these materials is that you can do it yourself.

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