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Thermal modification measurably increases the decay resistance of softwood in above-ground exterior use.

Under review — the register is reading the literature and will publish a conclusion once directional evidence has been indexed.

In plain terms

The published record broadly agrees with this. The evidence is still too thin to lean on for a decision.

This sentence is generated from the same numbers shown below — consensus share, confidence band and the number of indexed studies. Open any section to see exactly how it was reached.

Version 10 · WI-EV v1.0.0 · last swept 2026-09-18

Evidence Score

56

0–100, rule-based

Confidence

Low confidence

Too few, too old or too conflicting sources to specify from.

Consensus

100%

4 support · 0 contradict · 35 unclassified · 4 directionally assessed

Studies

39

1992–2026

Confidence is limited most by volume of evidence (3/30).

Behind the answer

All of the data, one click away.

Nothing here is hidden — it is folded, so the answer stays readable. Open any section to see exactly how the numbers were produced.

How the score is built6 weighted components, 56/100 total
Volume of evidence

4 directional studies, weighted by grade.

3/30
Study quality

Mean evidence grade 56/100 across the pool.

14/25
Agreement

100% of weighted directional evidence agrees.

20/20
Peer review

92% published in peer-reviewed venues.

9/10
Recency

Median publication year 2018.

7/10
Reproducibility

59% resolvable by DOI and independently checkable.

3/5
Where the literature disagreesNo direct contradictions in the indexed pool

No direct contradictions in the indexed pool. That is not the same as agreement — it can also mean too few directional studies have been published to disagree yet.

How the consensus moved over timeConsensus recomputed using only the evidence published up to each year
YearPublishedCumulativeSupportContradictConsensus
199222000%
200513000%
200825000%
201016000%
20112810100%
20131910100%
201551430100%
201631730100%
201711830100%
201811930100%
202052430100%
202122640100%
202222840100%
202333140100%
202533440100%
202633740100%
Revision history9 published revisions
  1. v103 new studies indexed.2026-08-16 · score 56 · 100%
  2. v91 new study indexed, Evidence Score -1 to 56.2026-08-12 · score 56 · 100%
  3. v83 new studies indexed.2026-08-10 · score 57 · 100%
  4. v7Evidence Score -2 to 57.2026-08-08 · score 57 · 100%
  5. v6Evidence Score +2 to 59.2026-08-08 · score 59 · 100%
  6. v5Evidence Score +1 to 57.2026-08-08 · score 57 · 100%
  7. v46 new studies indexed, Evidence Score -1 to 56.2026-08-08 · score 56 · 100%
  8. v312 new studies indexed, Evidence Score -4 to 57, consensus 0% → 100%.2026-08-06 · score 57 · 100%
  9. v214 new studies indexed, Evidence Score +61 to 61.2026-08-04 · score 61 · 0%
Every indexed record39 studies with stance, grade and citation count

Review of Wood Modification and Wood Functionalization Technologies

Samuel L. Zelinka, Michael Altgen, Lukas Emmerich et al. · 2022 · Forests · doi:10.3390/f13071004

The review describes thermal modification as performance-enhancing but gives no specific above-ground softwood decay result.

Neutral

Grade A · 174 citations

Peer-reviewed

Natural decay resistance (wood durability)

Robert A. Zabel, Jeffrey J. Morrell · 2020 · Wood Microbiology · doi:10.1016/b978-0-12-819465-2.00018-8

The title addresses natural wood durability without indicating thermal modification or above-ground testing

Neutral

Grade C · 3 citations

Peer-reviewed

Fundamentals and applications of photo-thermal catalysis

Diego Mateo, Jose L. Cerrillo, Sara Durini et al. · 2020 · Chemical Society Reviews · doi:10.1039/d0cs00357c

The work concerns light-driven chemical catalysis rather than wood modification or decay.

Neutral

Grade A · 758 citations

Peer-reviewed

Moisture in modified wood and its relevance for fungal decay

Emil Engelund Thybring, Maritta Kymäläinen, Lauri Rautkari · 2018 · iForest - Biogeosciences and Forestry · doi:10.3832/ifor2406-011

The review emphasizes moisture and chemical modification without establishing exterior decay resistance from thermal modification of softwood.

Neutral

Grade B · 46 citations

Peer-reviewed

Wood modification technologies - a review

Dick Sandberg, Andreja Kutnar, George I. Mantanis · 2017 · iForest - Biogeosciences and Forestry · doi:10.3832/ifor2380-010

The review discusses durable modified exterior products generally but reports no specific thermal-treatment result for softwood decay.

Neutral

Grade B · 472 citations

Peer-reviewed

The wood from the trees: The use of timber in construction

Michael H. Ramage, Henry C. Burridge, Marta Busse‐Wicher et al. · 2016 · Renewable and Sustainable Energy Reviews · doi:10.1016/j.rser.2016.09.107

The review concerns timber construction and environmental performance, not thermally modified softwood decay resistance.

Neutral

Grade B · 1343 citations

Peer-reviewed

The Search for Durable Exterior Clear Coatings for Wood

Philip D. Evans, Jonathan G. Haase, Anasyida Abu Seman et al. · 2015 · Coatings · doi:10.3390/coatings5040830

The study concerns clear-coating durability and chromic-acid pretreatment rather than thermally modified softwood decay.

Neutral

Grade B · 106 citations

Peer-reviewed

Wood modification by heat treatment: A review

Bruno Esteves, Helena M. Pereira · 2008 · BioResources · doi:10.15376/biores.4.1.esteves

The review discusses durability improvements generally but provides no specific above-ground softwood decay finding.

Neutral

Grade B · 835 citations

Peer-reviewed

Natural Decay Resistance (Wood Durability)

ROBERT A. ZABEL, JEFFREY J. MORRELL · 1992 · Wood Microbiology · doi:10.1016/b978-0-12-775210-5.50022-3

The title provides only general background on natural wood durability

Neutral

Grade D · 0 citations

Peer-reviewed

Stance classification is automated and reviewed against each record's own abstract; it is a reading of the literature, not a measurement. The Evidence Score is a rule-based function of indexed metadata under method WI-EV v1.0.0 and does not constitute proof of the statement.

Cite this claim

Citable, versioned, machine-readable.

Each claim keeps a permanent URL and a version number. Cite the version you read — earlier conclusions stay visible in the revision history above.

APA
WoodIntel. (2026). Thermal modification measurably increases the decay resistance of softwood in above-ground exterior use. (Evidence Engine WI-EV v1.0.0, claim version 10). Retrieved 2026-09-18, from https://woodintel.io/evidence/thermal-modification-durability
BibTeX
@misc{woodintel_thermal_modification_durability_2026,
  title  = {Thermal modification measurably increases the decay resistance of softwood in above-ground exterior use.},
  author = {{WoodIntel}},
  year   = {2026},
  note   = {Evidence Engine WI-EV v1.0.0, claim version 10, accessed 2026-09-18},
  url    = {https://woodintel.io/evidence/thermal-modification-durability}
}
Open API
curl https://woodintel.io/api/public/v1/evidence?claim=thermal-modification-durability

Returns the score, the indexed studies with stance and grade, the contradictions, the timeline and the full revision history. Open under CC BY 4.0 — API documentation.