KLH® CLT
Cross-laminated timber: layers of PEFC-certified spruce stacked crosswise and bonded with formaldehyde-free PU adhesive into large solid-wood panels. Made to order up to 16.5 × 3.5 m and 60–500 mm thick, for walls, floors and roofs.
Carbon and evidence
Product Evidence
Evidence currently held for the KLH product record.
Recorded Carbon Result
A1–A3 GWP-total incl. biogenic carbon storage. GWP-GHG (fossil) A1–A3 = 64 kgCO2e/m³.
Indicator: GWP-total
KLH® CLT Environmental Product Declaration · PDF p. 9, main environmental performance results, Scenario 1A1–A3 covers raw-material supply, transport to manufacture and manufacturing. It is product-stage information, not a whole-life result.
Environmental Product Declaration
EPD recorded- Coverage
- Representative product
- Declared unit
- 1 m³ (density 470 kg/m³)
- Programme
- EPD International (environdec.com)
- Registration
- EPD-IES-0027209:001
- Standard
- EN 15804+A2
- Valid until
- 2031-01-26
- Verification
- Third-party verified
The declaration reports representative KLH cross-laminated timber at 470 kg/m³; project thickness and quantity must be applied separately.
Carbon profile
kgCO2e per 1 m³ (density 470 kg/m³) · each bar starts at zero · local scale
A1-A3 product
-686
A4-A5 site*
74.4
B use
—
C end of life
795
D reuse / recycling
-262
Stores more carbon than making it emits — and the stored carbon largely leaves again at end of life.
Reported GWP Modules
Displayed as stored; modules are not added together here.
A1–A3
-686 kgCO₂e
per 1 m³ (density 470 kg/m³)
A4*
63.5 kgCO₂e
per 1 m³ (density 470 kg/m³)
A5*
10.9 kgCO₂e
per 1 m³ (density 470 kg/m³)
C1
9.57 kgCO₂e
per 1 m³ (density 470 kg/m³)
C2
4.47 kgCO₂e
per 1 m³ (density 470 kg/m³)
C3
781 kgCO₂e
per 1 m³ (density 470 kg/m³)
C4
0 kgCO₂e
per 1 m³ (density 470 kg/m³)
D
-262 kgCO₂e
per 1 m³ (density 470 kg/m³)
Upfront Carbon (A1–A5)*
-612 kgCO₂e per 1 m³ (density 470 kg/m³)
A1–A3 -686 + A4 63.5 + A5 10.9 · GWP-total, as declared
Service Life — the B4 Replacement Input
100 years · EPD reference service life
≈1 installation over a 60-year building study period.
Sourced Product Claims
1 claim is held in the staging record but not presented as product evidence because an exact public source has not yet been mapped.
Evidence Sources
EPD International (environdec.com) · PDF p. 9, main environmental performance results, Scenario 1
Coverage: The declaration reports representative KLH cross-laminated timber at 470 kg/m³; project thickness and quantity must be applied separately.
Comparison Status
The record contains the basic metadata required for a controlled comparison. Products must still perform the same function and use compatible units, PCRs and lifecycle scope.
Evidence Gaps
- •1 sustainability claim is withheld because exact public evidence is not mapped.
Design & Specification Notes
Qualitative notes for early design discussion. Not product-specific EPD evidence, and not a basis for numerical comparison.
Cross-laminated timber: layers of PEFC-certified spruce stacked crosswise and bonded with formaldehyde-free PU adhesive into large solid-wood panels.
Typical Uses
- •Primary frame
- •Long-span elements
- •Load-bearing supports
Key Performance
High load-bearing capacity for primary frame.
Specification Actions
- •Confirm FSC or PEFC certification for all timber products.
- •Request chain-of-custody documentation from supplier.
- •Confirm the current EPD covers the selected product, finish and manufacturing route.
Indicative Health & Indoor Air
Solid timber with formaldehyde-free PU adhesive; no added-formaldehyde emissions.
Specification
- Range
- KLH CLT
- Collection
- KLH CLT
- Finish
- Exposed cross-laminated spruce
- Thickness
- 60–500mm
- Width
- 3500mm
- Length
- up to 16500mm
- Fire rating
- Euroclass D-s2,d0; 30/60/90/120 min achievable by thickness
- Service life
- 100 years