Recycled paper fibre, blown into cavities; good fit around irregular framing.
Cost
Low
Upkeep
None
Skill to build
Basic
Lifespan
20-30 years typical before settling/moisture uptake reduces performance; can be topped up rather than fully replaced
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.