Rigid/semi-rigid boards of mineralised wood fibre; good thermal and acoustic performance.
Cost
Medium
Upkeep
None
Skill to build
Basic
Lifespan
50+ years if kept dry, similar to other rigid fibre insulation boards
Embodied carbon
Low
Space / material use
Low
Output timing
None
Skill to repair
Basic
Regulation (FR example)
New construction falls under RE2020, which sets thermal and carbon performance thresholds for the building as a whole rather than approving individual materials.
Note: Cost, carbon and footprint are rated against the other options for this same need, not in absolute terms.
No sizing or quantities: how much a technique yields, and how much a household needs, both depend on the build and the people, so the catalogue compares options rather than dimensioning them. It carries no bill of materials and no build sequence, and it is written for an oceanic, clay-soil climate (Normandy, France). Regulatory notes are indicative and need confirming locally.