Thermowood Decking

Name: Thermowood Decking
Brand: Lunawood

Nordic spruce and pine modified at 212 °C in Lunawood’s Finnish mills and profiled as deck boards — planed, brushed or grooved, from 26×92 up to 42×92, all in the LunaThermo-D durability class. Supplied raw and meant to stay that way: Lunawood’s argument is that a board needing no coating over its life is the sustainable choice, not just the one with the lowest factory-gate figure. Left alone it silvers evenly.

Manufacturer page

Carbon and evidence

Product Evidence

Evidence currently held for the Lunawood product record.

Lunawood

Recorded Carbon Result

-522kgCO₂e/m³

A1–A3 GWP-total per m³ of board, per the EPD's own impact table. Negative because 652 kgCO2e of biogenic carbon is held in the timber. That store is not permanent: the same EPD declares C3 = +703 kgCO2e when the boards are processed at end of life, so cradle-to-grave is close to neutral rather than strongly negative.

Indicator: GWP-total

A1–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: Product family
Declared unit: 1 m³ 390 kg
Programme: RTS EPD (Building Information Foundation RTS, Finland)
Registration: RTS 180 22
Standard: EN 15804:2012+A2:2019
Valid until: 2027-05-12
Verification: Third-party verified

A production-volume weighted average across Lunawood’s two mills (Kaskinen and Iisalmi). The declaration covers four variants — Rough and Planed, each in Thermo-S and Thermo-D. Figures here are Planed Thermowood® Thermo-D, which is the class every deck profile is supplied in. The EPD notes that GWP-total differs by more than 10% between the two mills.

EPD on the manufacturer’s siteSource: PDF Table 20c "Environmental impacts (A1-A3), Lunawood Planed Thermowood® D": A1-A3 ‐5,22E+02, A4 1,16E‐02 per km, C1 3,66E‐01, C2 6,82E‐02 per km, C3 7,03E+02, C4 3,66E+01, D ‐7,52E+02. Declared unit one nominal m³ at 5% moisture content (§16).

Carbon profile

kgCO2e per 1 m³ of board · each bar starts at zero · local scale

A1-A3 product

-522

A4-A5 site*

not declared

—

B use

not declared

—

C end of life

740

D reuse / recycling

-752

Stores more carbon than making it emits — and the stored carbon largely leaves again at end of life.

adds carbon stores or removes EPD scenario* reuse/recycling potential (D)

* EPD transport and installation scenario, not this project's. Not declared: site, use. Module D shows potential impacts or benefits from reuse, recovery or recycling after the product's assessed life. It is reported separately and never added to A-C. Do not compare bar lengths between materials. Each chart may use a different scale and declared unit.

Reported GWP Modules

Displayed as stored; modules are not added together here.

A1–A3

-522 kgCO₂e

per 1 m³ of board

0.366 kgCO₂e

per 1 m³ of board

703 kgCO₂e

per 1 m³ of board

36.6 kgCO₂e

per 1 m³ of board

-752 kgCO₂e

per 1 m³ of board

* A4/A5 are EPD scenarios, not project-specific results. Module D is outside the A–C system boundary and is not added to A–C. Module nomenclature follows BS EN 15978 / EN 15804. Declared values are suitable as inputs to a whole life carbon assessment under the RICS Professional Standard (2nd edition); this panel is not an assessment.

Sourced Product Claims

Stores 652 kgCO2e/m³ biogenic carbon, releases 703 at end of lifeThird-party verifiedSource
Third-party verified EPD, valid to 2027-05-12Third-party verifiedSource
Nordic Swan Ecolabel — durable/resistant wood for outdoor useThird-party verifiedSource
PEFC chain of custodyThird-party verifiedSource
FSC chain of custodyThird-party verifiedSource

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

Lunawood Thermowood® of Nordic Pine and Spruce (RTS EPD 180 22)

RTS EPD (Building Information Foundation RTS, Finland)

Third-party verified

Oy Lunawood Ltd PEFC chain-of-custody certificate

PEFC

Third-party verified

Oy Lunawood Ltd FSC chain-of-custody certificate

FSC

Third-party verified

Nordic Swan Ecolabel licence 4086-0005, Oy Lunawood Ltd

Nordic Ecolabelling

Third-party verified

Comparison Status

This result should be displayed for information only and not ranked against another product.

• The carbon result is not linked to an evidence source.
• The EPD is not linked to an evidence source.

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.

Typical Uses

•Paths & paving
•Public realm surfaces
•Permeable groundworks

Key Performance

Durable external surface with slip resistance.

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

low Risk

Thermal modification uses heat and steam only — no preservatives or biocides are added. Modified timber is more brittle than untreated softwood and the dust is fine; standard cutting-dust precautions apply. Specify stainless fixings — thermally modified timber is more acidic than untreated wood and will stain around plain steel.

Evidence:Third-party verified

Specification

Range: Luna SHP, SHP Profix, Deck 2 Profix — Thermo-D
Collection: Lunawood Thermowood®
Finish: Planed Thermowood® deck board, Thermo-D
Country of manufacture: Finland