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

Dowel- or nail-laminated timber decks using solid softwood; glue-free, demountable, and fully bio-based.

Typical Uses

•Primary frame
•Long-span elements
•Load-bearing supports

Key Performance

High load-bearing capacity for primary frame.

Specification Actions

•Provide FSC or PEFC chain-of-custody proof (and origin details if reclaimed).
•Verify adhesive/fastener specification
•Verify acoustic performance if exposed

Indicative Health & Indoor Air

low Risk

•formaldehyde

Natural material. Verify adhesive and fastener coatings for emissions if exposed internally.

Evidence:No evidence held

Category baseline

No baseline established

No published figure for this category meets the declared unit, lifecycle modules and standard needed to sit alongside product declarations.

Searched and rejected. Published glulam figures disagree by roughly 46% (117.6 vs 172.18 kgCO2e/m³ A1–A3), and the lower one is itself derived from a per-kg factor via an assumed 420 kg/m³ softwood density rather than published per m³. CLT figures found were A1–A5 and net negative, mixing biogenic carbon into the scope. A baseline here needs a source that publishes per m³ at A1–A3 on a stated biogenic convention; none was found. All five products in this category declare per m³, so the unit is not the obstacle — the absence of a comparable published figure is.

Products in this category

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

Specification

Finish: Dowel/nail-laminated timber
Service life: 60 years