Carbon and evidence

Product Evidence

Generic material record — no manufacturer product attached.

AI-estimated material

Evidence Base

Category estimate

No product evidence is attached to this generic material, so nothing on this card is numerical. The guidance below is qualitative — an AI-assisted category profile — for early design discussion, not for figures.

Next step: request a current product EPD or manufacturer carbon declaration, or swap in a branded product that holds one.

What's missing (3)

•No current product EPD is recorded.
•No quantified carbon result is recorded.
•No product-specific circularity or material-health claims are recorded.

Service Life — the B4 Replacement Input

60 years · basis not recorded

≈1 installation over a 60-year building study period.

B4 (replacement) follows the building, not the product: an assessor multiplies replacement cycles by project quantities. This record supplies the service life and does not compute B4.

Design & Specification Notes

Natural hemp fibre insulation batts; vapour-open, hygroscopic and renewable.

Typical Uses

•Thermal envelope
•Roof/wall cavities
•Airtightness layers

Key Performance

Good thermal resistance with reduced heat loss.

Specification Actions

•Provide provenance for hemp supply and declare fire retardant treatment (type and toxicity).
•Verify hemp sourcing and fire retardant treatment
•Confirm vapour permeability suits build-up

Indicative Health & Indoor Air

low Risk

•fire-retardants

Natural material with excellent indoor air quality. Verify fire retardant (typically borate) is non-toxic.

Evidence:No evidence held

Products in this category

4 products from 4 manufacturers. Ordered by the evidence each record holds, never by commercial standing.

Specification

Finish: Hemp fiber batts
Service life: 60 years