Insulation

Wood Fibre Insulation.

Wood fibre insulation has a low CO₂ footprint — 0.15–0.55 kg CO₂-eq/kg depending on product and manufacturing method. For comparison: mineral wool emits approx. 1.05 kg CO₂-eq/kg. The wood also stores biogenic carbon for the building's lifetime.

Key Figures

Carbon Footprint (GWP): 0.15 kg CO₂-eq/kg
Density: 30–270 kg/m³ (løsfyld: 30–60, bløde plader: 40–60, stive plader: 140–270)
Expected Lifespan: 50+ år

What is wood fibre insulation?

Wood fibre insulation is made from softwood fibres — typically spruce or pine — pressed into boards or supplied as loose fill for blowing. It is the most widely used bio-based insulation material in Scandinavia. Wood fibre has a unique combination of good insulation performance, high thermal mass (summer cooling) and vapour permeability. Available as flexible batts, rigid sheathing boards and loose fill.

Carbon Footprint Compared

Træfiberisolering ← this material 0.15 kg CO₂/kg

Cellulose insulation 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 loose fill)
check_circle Exterior walls (flexible batts between studs)
check_circle Wind barrier (rigid wood fibre boards)
check_circle Roof insulation (boards and loose fill)
check_circle Floors in timber structures

In Renovation

Wood fibre insulation is the most versatile bio-based insulation material for renovation. Loose fill can be blown into existing attic structures. Flexible batts fit in exterior walls with timber framing. Rigid boards can be used as external wind barriers and additional insulation during facade renovation. It is the bio-based material closest to mineral wool in price and installation.

Questions about wood fibre insulation

What is the advantage of wood fibre over mineral wool?

Three things: 1) Higher thermal mass provides better summer cooling — up to 6-8 hours delay of heat transmission. 2) Better moisture regulation in vapour-open structures. 3) Lower CO₂ footprint (0.15 vs. 1.05 kg CO₂-eq/kg).

Can wood fibre be blown on top of existing insulation?

Yes. Loose fill wood fibre can be blown on top of existing mineral wool in the attic. It's a simple and effective way to increase insulation. Ensure the attic structure is vapour-open and ventilated.

Is wood fibre insulation fire safe?

Rigid boards are self-supporting in fire and are rated Euroclass B-s1,d0. Flexible batts and loose fill are treated with fire retardant. Behind plasterboard, fire resistance is comparable to mineral wool.

Can wood fibre be used as a wind barrier?

Yes. Rigid wood fibre boards (density 140-270 kg/m³) are a well-documented wind barrier product. They are vapour-permeable, insulating and provide structural rigidity. Hunton and Steico are the most common manufacturers in Scandinavia.

Related Materials

Insulation

Need advice?

We help you choose the right materials for your project — with focus on sustainability, durability, and economy.