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We use sprayed cellulose wool instead of the commonly used mineral wool for the thermal insulation of the roofs, ceilings, and external walls of glued laminated timber houses. This is made of scrap paper; paper, however, is made of wood, so the cellulose wool is a very good match for our house concept.
Another advantage of cellulose wool compared to mineral wools (glass and rock wool) is its capability to bind and release moisture. This means that excessive moisture is absorbed by the structure of the room without damaging it in the humid period in summer; in the dry heating period in winter, however, the moisture is released, balancing the indoor air climate naturally, without using any additional devices. Thanks to those characteristics, it is not necessary to use construction film or other moisture barriers in the insulated structures. Instead of these, we use vapour barrier paper, which ensures a better indoor climate of the house and a suitable moisture level.
This breathing structure prevents the so-called ‘thermos effect’ in the house.
As cellulose wool is highly porous, it has very good insulation, i.e. heat retention qualities.
The antiseptic substance borax used in cellulose wool protects it from potential pests and rodents and improves the fire resistance of the wool.
Another advantage of cellulose wool is the fact that it is easy and quick to install, which is also expressed in its lower cost. After thermal insulation works, we perform a thermographic survey and airtightness check in each house to further inspect the quality of those works and the general heat retention of the building.
There are many other natural thermal insulation materials used worldwide in addition to cellulose wool, such as hemp wool, wood fibre wool, or an insulation material made of reed. Cellulose wool is more cost-efficient compared to other natural insulation materials.