--- title: "Wood Fibre Insulation - GWP and renovation use" canonical_url: https://fremtidenstegnestue.dk/en/knowledge/materials/traefiber-isolering markdown_url: https://fremtidenstegnestue.dk/en/knowledge/materials/traefiber-isolering.md author: "Fremtidens Tegnestue" page_type: material primary_intent: "Explain use, GWP and renovation relevance for Wood Fibre Insulation." primary_keyword: "Wood Fibre Insulation" audience: "Homeowners, studios and agents researching material choices." summary: "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." source_basis: - "BUILD Report 2022:09 / Realdania (interval: 0.036–0.55 depending on product and scenario)" - "Social- og Boligstyrelsen: Klimakrav og LCA i bygningsreglementet: https://www.sbst.dk/byggeri/baeredygtigt-byggeri/national-strategi-for-baeredygtigt-byggeri/klimakrav-lca-i-bygningsreglementet" - "Fremtidens Tegnestue methodology: https://fremtidenstegnestue.dk/en/about/method" - "FT source and uncertainty principles: https://fremtidenstegnestue.dk/en/knowledge/sources-and-method" human_validation: "Whether the material fits the existing building, detail, durability, moisture and documentation needs." responsibility_line: "AI can prepare, compile and flag uncertainty. The architect validates the consequences." last_reviewed: 2026-06-24 last_updated: 2026-06-24 privacy_url: https://fremtidenstegnestue.dk/en/privacy related_pages: - url: https://fremtidenstegnestue.dk/en/knowledge/materials/celluloseisolering relation: alternative-material - url: https://fremtidenstegnestue.dk/en/knowledge/materials/hampisolering relation: alternative-material - url: https://fremtidenstegnestue.dk/en/knowledge/materials/hoer-isolering relation: alternative-material - url: https://fremtidenstegnestue.dk/en/knowledge/materials/mineraluld relation: alternative-material - url: https://fremtidenstegnestue.dk/en/knowledge/materials/glasuld relation: alternative-material - url: https://fremtidenstegnestue.dk/en/knowledge/materials relation: hub - url: https://fremtidenstegnestue.dk/en/knowledge/concepts/lca relation: concept status: published --- # Wood Fibre Insulation - GWP and renovation use Canonical URL: https://fremtidenstegnestue.dk/en/knowledge/materials/traefiber-isolering Markdown URL: https://fremtidenstegnestue.dk/en/knowledge/materials/traefiber-isolering.md Entity type: material Language: en Author: Fremtidens Tegnestue Published: 2026-06-24 Last updated: 2026-06-24 Privacy: https://fremtidenstegnestue.dk/en/privacy ## Short answer 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. ## Who it is relevant for Homeowners, studios and agents researching material choices. ## What FT can prepare - Summarise material properties, GWP, common uses, renovation relevance and alternatives. ## What the architect validates - Whether the material fits the existing building, detail, durability, moisture and documentation needs. ## Key figures | Metric | Value | | --- | --- | | GWP | 0.15 kg CO₂-eq/kg | | Density | 30–270 kg/m³ (loose fill: 30–60, soft boards: 40–60, rigid boards: 140–270) | | Expected lifetime | 50+ years | ## Use - Attic insulation (blown loose fill) - Exterior walls (flexible batts between studs) - Wind barrier (rigid wood fibre boards) - Roof insulation (boards and loose fill) - Floors in timber structures ## Renovation relevance 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. ## Comparison | Material | GWP | | --- | --- | | Wood fibre insulation | 0.15 | | Cellulose insulation | 0.12 | | Flax insulation | -0.56 | | Glass wool | 0.85 | | Mineral wool | 1.05 | ## FAQ ### 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. ## Sources and basis - BUILD Report 2022:09 / Realdania (interval: 0.036–0.55 depending on product and scenario) - [Social- og Boligstyrelsen: Klimakrav og LCA i bygningsreglementet](https://www.sbst.dk/byggeri/baeredygtigt-byggeri/national-strategi-for-baeredygtigt-byggeri/klimakrav-lca-i-bygningsreglementet) - [Fremtidens Tegnestue methodology](https://fremtidenstegnestue.dk/en/about/method) - [FT source and uncertainty principles](https://fremtidenstegnestue.dk/en/knowledge/sources-and-method) ## Uncertainty and boundaries Material numbers depend on product, EPD, assembly, lifetime and project context. ## Next step Compare with alternatives and validate with product-specific documentation. ## Related pages - [Cellulose Insulation](https://fremtidenstegnestue.dk/en/knowledge/materials/celluloseisolering): alternative-material - [Hemp Insulation](https://fremtidenstegnestue.dk/en/knowledge/materials/hampisolering): alternative-material - [Flax Insulation](https://fremtidenstegnestue.dk/en/knowledge/materials/hoer-isolering): alternative-material - [Mineral Wool](https://fremtidenstegnestue.dk/en/knowledge/materials/mineraluld): alternative-material - [Glass Wool](https://fremtidenstegnestue.dk/en/knowledge/materials/glasuld): alternative-material - [Materials](https://fremtidenstegnestue.dk/en/knowledge/materials): hub - [LCA](https://fremtidenstegnestue.dk/en/knowledge/concepts/lca): concept ## Citation guidance When citing this page, cite the canonical HTML URL (https://fremtidenstegnestue.dk/en/knowledge/materials/traefiber-isolering) as the public source and use this Markdown URL only as the agent-readable representation. Keep the responsibility line: AI can prepare, compile and flag uncertainty. The architect validates the consequences.