Thermowood Cladding

Name: Thermowood Cladding
Brand: Lunawood

Planed Nordic pine and spruce modified at 212 °C in Lunawood’s Finnish mills — the Thermo-D class, where durability rather than stability is the target. Supplied uncoated and designed to be left that way: Lunawood’s case is that a board needing no surface coating in a Nordic climate is the sustainable choice over its whole life, not just at the factory gate. It silvers evenly if left alone.

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, the cladding product. 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.

Planed Nordic pine and spruce modified at 212 °C in Lunawood’s Finnish mills — the Thermo-D class, where durability rather than stability is the target.

Typical Uses

•Facade cladding
•Weather protection
•External accents

Key Performance

Weather-resistant finish for facade exposure.

Typical Service-Life Estimate

40 years

Generic estimate for early design discussion; confirm with the manufacturer.

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.

Evidence:Third-party verified

Specification

Range: Planed Thermowood® cladding, Thermo-D
Collection: Lunawood Thermowood®
Finish: Planed Thermowood® board, Thermo-D
Thickness: 14–43 mm
Width: 42–142 mm
Country of manufacture: Finland