Insulation

Cellulose Insulation.

Cellulose insulation is one of the most sustainable insulation materials — made from recycled material, very low CO₂ footprint, and good hygrothermal properties. An overlooked and underrated choice.

Key Figures

Carbon Footprint (GWP): 0.12 kg CO₂-eq/kg
Density: 25–60 kg/m³
Expected Lifespan: 50+ år

What is cellulose insulation?

Cellulose insulation is made from recycled paper (typically newspapers and cardboard) and treated with borates as fire protection. It is one of the most climate-friendly forms of insulation, and in addition to a low carbon footprint has good sound absorption and good hygrothermal properties. It is normally blown in loose form.

Carbon Footprint Compared

Cellulose insulation ← this material 0.12 kg CO₂/kg

Hemp insulation −0.56 kg CO₂/kg

Glass wool 0.85 kg CO₂/kg

Mineral wool 1.05 kg CO₂/kg

Negative carbon footprint (green) indicates carbon storage. Data based on EPD averages from ECO Platform and estimates per EN 15804.

Typical Applications

check_circle Attic insulation (blown)
check_circle Exterior walls (sprayed)
check_circle Roof rafters (blown)
check_circle Floors over unheated basement

In Renovation

Cellulose insulation is ideal for renovation of older houses with irregular attic spaces. It fills all gaps and cracks and is easy to adapt to non-standard structures.

Questions about cellulose insulation

How is cellulose insulation installed?

Typically as loose-fill blown with specialist equipment (blowing machine) or sprayed as 'wet cellulose' to closed cavities and sloped walls. Requires specialist equipment but is fast and effective.

Is cellulose insulation fire safe?

Yes — borate treatment provides good fire resistance. Cellulose insulation is rated for use behind non-combustible cladding. It is no more fire-prone than mineral wool when correctly installed.

Does cellulose insulation absorb moisture?

Cellulose has hygro-active properties: it absorbs and releases moisture. Unlike mineral wool, this does not cause problems — cellulose regulates the moisture balance and dries out without losing insulating capacity.

Is cellulose insulation more expensive than mineral wool?

Material cost is lower, but installation cost is slightly higher (requires specialist blowing equipment). Overall cost is comparable to mineral wool.

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