Cellulose wadding

Technical solutions market booming, cellulose wadding is an insulating material from waste newsprint non-distributed, crushed and kneaded. It arises by four techniques.

Appeared in France some twenty years, but made ​​since the thirties in the United States and Canada, cellulose wadding is an alternative to mineral fibers do not pose a risk to health.

It comes in bulk or since November 2009 in France, in the form of semi-rigid panels. Its thermal properties (it can achieve high thermal performance with R from July to August), its ability to heat phase (9-12 h) and its manufacturing process are an insulation material having a better quality reports technical, environmental and cost.

Good thermal inertia

Breathable, cellulose wadding absorbs up to 30% moisture. Stabilized by incorporation of additives (borax *), it is insect resistant, flame retardant, and antifungal.

Cellulose wadding has a thermal mass with a good coefficient of thermal conductivity of from 0.038 to 0.043 W / mK, when loose. And 0.039 in the form of panels. The sound level, it allows a sound reduction of 20 to 30 decibels. These performances vary depending on the installation method: blow, injection, wet spraying, or panels.

Its density is a function of the mode of application. It can vary between 30 kg/m3 and 60 kg/m3, we must consider a packing rate estimated 10 to 20% depending on the thickness applied (25 to 40 cm), more than ten years. Sustainability can reach more than fifty years.

The cost of buying a machine to blow between 4 500 and 10 000 euros.

* Note: The borax is a natural product extracted from open pits. Repellent against wood-boring insects, it prevents the formation of fungi and rot makes wadding.

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