What changed, and when.

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

confidence low → moderate.

Long-lived timber construction products deliver a net biogenic carbon storage benefit over the building service life.

consensus 85% → 84%, confidence moderate → low.

Charring rates of cross-laminated timber under standard fire exposure are predictable within the Eurocode 5 design assumptions.

WI-EV v1.7.0: Unclear. Direction calculated from existing weighted primary studies (0 support, 0 contradict). Evidence strength withheld: insufficient evidence; low confidence. Verdict thresholds: two-thirds weighted support or opposition, otherwise Mixed; fewer than three directional studies = Unclear. Score arithmetic, classifications and confidence thresholds unchanged. No score was set by hand. Re-swept; no change to the published figures.

Untreated larch cladding reaches a service life comparable to surface-treated softwood in temperate Northern European climates.

WI-EV v1.7.0: Unclear. Direction calculated from existing weighted primary studies (0 support, 0 contradict). Evidence strength withheld: insufficient evidence; low confidence. Verdict thresholds: two-thirds weighted support or opposition, otherwise Mixed; fewer than three directional studies = Unclear. Score arithmetic, classifications and confidence thresholds unchanged. No score was set by hand. Re-swept; no change to the published figures.

Design detailing that keeps water off end grain affects the service life of exterior wood more than moving one EN 350 durability class.

WI-EV v1.7.0: Unclear. Direction calculated from existing weighted primary studies (0 support, 0 contradict). Evidence strength withheld: insufficient evidence; low confidence. Verdict thresholds: two-thirds weighted support or opposition, otherwise Mixed; fewer than three directional studies = Unclear. Score arithmetic, classifications and confidence thresholds unchanged. No score was set by hand. Re-swept; no change to the published figures.

Regular maintenance of a film-forming coating extends the service life of exterior timber cladding more than the initial coating choice does.

WI-EV v1.7.0: Unclear. Direction calculated from existing weighted primary studies (0 support, 0 contradict). Evidence strength withheld: insufficient evidence; low confidence. Verdict thresholds: two-thirds weighted support or opposition, otherwise Mixed; fewer than three directional studies = Unclear. Score arithmetic, classifications and confidence thresholds unchanged. No score was set by hand. Re-swept; no change to the published figures.

Sustained wood moisture content above 25 percent is the controlling condition for fungal decay initiation in above-ground timber.

WI-EV v1.7.0: Unclear. Direction calculated from existing weighted primary studies (2 support, 0 contradict). Evidence strength withheld: insufficient evidence; low confidence. Verdict thresholds: two-thirds weighted support or opposition, otherwise Mixed; fewer than three directional studies = Unclear. Score arithmetic, classifications and confidence thresholds unchanged. No score was set by hand. Re-swept; no change to the published figures.

Mass timber assemblies carry a higher built-in moisture risk during construction than they do in service.

WI-EV v1.7.0: Unclear. Direction calculated from existing weighted primary studies (2 support, 0 contradict). Evidence strength withheld: insufficient evidence; low confidence. Verdict thresholds: two-thirds weighted support or opposition, otherwise Mixed; fewer than three directional studies = Unclear. Score arithmetic, classifications and confidence thresholds unchanged. No score was set by hand. Re-swept; no change to the published figures.

Silicate-based surface treatments measurably slow the surface weathering of exterior softwood.

WI-EV v1.7.0: Unclear. Direction calculated from existing weighted primary studies (0 support, 1 contradict). Evidence strength withheld: insufficient evidence; low confidence. Verdict thresholds: two-thirds weighted support or opposition, otherwise Mixed; fewer than three directional studies = Unclear. Score arithmetic, classifications and confidence thresholds unchanged. No score was set by hand. Re-swept; no change to the published figures.

Acetylation reduces the moisture-driven dimensional movement of wood by more than half relative to the untreated species.

WI-EV v1.7.0: Unclear. Direction calculated from existing weighted primary studies (0 support, 0 contradict). Evidence strength withheld: insufficient evidence; low confidence. Verdict thresholds: two-thirds weighted support or opposition, otherwise Mixed; fewer than three directional studies = Unclear. Score arithmetic, classifications and confidence thresholds unchanged. No score was set by hand. Re-swept; no change to the published figures.

Preservative-treated Scots pine sapwood reaches the intended service life in EN 335 use class 3 exposure.

WI-EV v1.7.0: Unclear. Direction calculated from existing weighted primary studies (0 support, 0 contradict). Evidence strength withheld: insufficient evidence; low confidence. Verdict thresholds: two-thirds weighted support or opposition, otherwise Mixed; fewer than three directional studies = Unclear. Score arithmetic, classifications and confidence thresholds unchanged. No score was set by hand. Re-swept; no change to the published figures.

Accelerated laboratory weathering tests reliably predict field performance of exterior wood coatings.

WI-EV v1.7.0: Contradicted. Direction calculated from existing weighted primary studies (1 support, 3 contradict). Evidence strength 45/100; low confidence. Verdict thresholds: two-thirds weighted support or opposition, otherwise Mixed; fewer than three directional studies = Unclear. Score arithmetic, classifications and confidence thresholds unchanged. No score was set by hand. Re-swept; no change to the published figures.

The Scheffer climate index is a reliable predictor of above-ground decay hazard across climate zones.

WI-EV v1.7.0: Supported. Direction calculated from existing weighted primary studies (3 support, 0 contradict). Evidence strength 45/100; low confidence. Verdict thresholds: two-thirds weighted support or opposition, otherwise Mixed; fewer than three directional studies = Unclear. Score arithmetic, classifications and confidence thresholds unchanged. No score was set by hand. Re-swept; no change to the published figures.

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

WI-EV v1.7.0: Supported. Direction calculated from existing weighted primary studies (14 support, 1 contradict). Evidence strength 52/100; low confidence. Verdict thresholds: two-thirds weighted support or opposition, otherwise Mixed; fewer than three directional studies = Unclear. Score arithmetic, classifications and confidence thresholds unchanged. No score was set by hand. Re-swept; no change to the published figures.

Substituting timber for mineral structural materials reduces the cradle-to-gate greenhouse gas emissions of a building.

WI-EV v1.7.0: Supported. Direction calculated from existing weighted primary studies (12 support, 0 contradict). Evidence strength 55/100; low confidence. Verdict thresholds: two-thirds weighted support or opposition, otherwise Mixed; fewer than three directional studies = Unclear. Score arithmetic, classifications and confidence thresholds unchanged. No score was set by hand. Re-swept; no change to the published figures.

Long-lived timber construction products deliver a net biogenic carbon storage benefit over the building service life.

WI-EV v1.7.0: Supported. Direction calculated from existing weighted primary studies (14 support, 2 contradict). Evidence strength 58/100; moderate confidence. Verdict thresholds: two-thirds weighted support or opposition, otherwise Mixed; fewer than three directional studies = Unclear. Score arithmetic, classifications and confidence thresholds unchanged. No score was set by hand. Re-swept; no change to the published figures.

Mass timber assemblies carry a higher built-in moisture risk during construction than they do in service.

1 new study indexed.

Long-lived timber construction products deliver a net biogenic carbon storage benefit over the building service life.

1 new study indexed.

Sustained wood moisture content above 25 percent is the controlling condition for fungal decay initiation in above-ground timber.

Re-swept; no change to the published figures.

The Scheffer climate index is a reliable predictor of above-ground decay hazard across climate zones.

Re-swept; no change to the published figures.

Accelerated laboratory weathering tests reliably predict field performance of exterior wood coatings.

Re-swept; no change to the published figures.

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

confidence moderate → low.

Acetylation reduces the moisture-driven dimensional movement of wood by more than half relative to the untreated species.

WI-EV v1.6.0: Unclear. Direction calculated from existing weighted primary studies (0 support, 0 contradict). Evidence strength withheld: insufficient evidence; low confidence. Verdict thresholds: two-thirds weighted support or opposition, otherwise Mixed; fewer than three directional studies = Unclear. Score arithmetic, classifications and confidence thresholds unchanged. No score was set by hand. Re-swept; no change to the published figures.

Design detailing that keeps water off end grain affects the service life of exterior wood more than moving one EN 350 durability class.

WI-EV v1.6.0: Unclear. Direction calculated from existing weighted primary studies (0 support, 0 contradict). Evidence strength withheld: insufficient evidence; low confidence. Verdict thresholds: two-thirds weighted support or opposition, otherwise Mixed; fewer than three directional studies = Unclear. Score arithmetic, classifications and confidence thresholds unchanged. No score was set by hand. Re-swept; no change to the published figures.

Charring rates of cross-laminated timber under standard fire exposure are predictable within the Eurocode 5 design assumptions.

WI-EV v1.6.0: Unclear. Direction calculated from existing weighted primary studies (0 support, 0 contradict). Evidence strength withheld: insufficient evidence; low confidence. Verdict thresholds: two-thirds weighted support or opposition, otherwise Mixed; fewer than three directional studies = Unclear. Score arithmetic, classifications and confidence thresholds unchanged. No score was set by hand. Re-swept; no change to the published figures.

Preservative-treated Scots pine sapwood reaches the intended service life in EN 335 use class 3 exposure.

WI-EV v1.6.0: Unclear. Direction calculated from existing weighted primary studies (0 support, 0 contradict). Evidence strength withheld: insufficient evidence; low confidence. Verdict thresholds: two-thirds weighted support or opposition, otherwise Mixed; fewer than three directional studies = Unclear. Score arithmetic, classifications and confidence thresholds unchanged. No score was set by hand. Re-swept; no change to the published figures.

Mass timber assemblies carry a higher built-in moisture risk during construction than they do in service.

WI-EV v1.6.0: Unclear. Direction calculated from existing weighted primary studies (2 support, 0 contradict). Evidence strength withheld: insufficient evidence; low confidence. Verdict thresholds: two-thirds weighted support or opposition, otherwise Mixed; fewer than three directional studies = Unclear. Score arithmetic, classifications and confidence thresholds unchanged. No score was set by hand. Re-swept; no change to the published figures.

Regular maintenance of a film-forming coating extends the service life of exterior timber cladding more than the initial coating choice does.

WI-EV v1.6.0: Unclear. Direction calculated from existing weighted primary studies (0 support, 0 contradict). Evidence strength withheld: insufficient evidence; low confidence. Verdict thresholds: two-thirds weighted support or opposition, otherwise Mixed; fewer than three directional studies = Unclear. Score arithmetic, classifications and confidence thresholds unchanged. No score was set by hand. Re-swept; no change to the published figures.

Silicate-based surface treatments measurably slow the surface weathering of exterior softwood.

WI-EV v1.6.0: Unclear. Direction calculated from existing weighted primary studies (0 support, 1 contradict). Evidence strength withheld: insufficient evidence; low confidence. Verdict thresholds: two-thirds weighted support or opposition, otherwise Mixed; fewer than three directional studies = Unclear. Score arithmetic, classifications and confidence thresholds unchanged. No score was set by hand. Re-swept; no change to the published figures.

Sustained wood moisture content above 25 percent is the controlling condition for fungal decay initiation in above-ground timber.

WI-EV v1.6.0: Unclear. Direction calculated from existing weighted primary studies (2 support, 0 contradict). Evidence strength withheld: insufficient evidence; low confidence. Verdict thresholds: two-thirds weighted support or opposition, otherwise Mixed; fewer than three directional studies = Unclear. Score arithmetic, classifications and confidence thresholds unchanged. No score was set by hand. Re-swept; no change to the published figures.

Untreated larch cladding reaches a service life comparable to surface-treated softwood in temperate Northern European climates.

WI-EV v1.6.0: Unclear. Direction calculated from existing weighted primary studies (0 support, 0 contradict). Evidence strength withheld: insufficient evidence; low confidence. Verdict thresholds: two-thirds weighted support or opposition, otherwise Mixed; fewer than three directional studies = Unclear. Score arithmetic, classifications and confidence thresholds unchanged. No score was set by hand. Re-swept; no change to the published figures.

Accelerated laboratory weathering tests reliably predict field performance of exterior wood coatings.

WI-EV v1.6.0: Contradicted. Direction calculated from existing weighted primary studies (1 support, 3 contradict). Evidence strength 45/100; low confidence. Verdict thresholds: two-thirds weighted support or opposition, otherwise Mixed; fewer than three directional studies = Unclear. Score arithmetic, classifications and confidence thresholds unchanged. No score was set by hand. Re-swept; no change to the published figures.

The Scheffer climate index is a reliable predictor of above-ground decay hazard across climate zones.

WI-EV v1.6.0: Supported. Direction calculated from existing weighted primary studies (3 support, 0 contradict). Evidence strength 45/100; low confidence. Verdict thresholds: two-thirds weighted support or opposition, otherwise Mixed; fewer than three directional studies = Unclear. Score arithmetic, classifications and confidence thresholds unchanged. No score was set by hand. Re-swept; no change to the published figures.

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

WI-EV v1.6.0: Supported. Direction calculated from existing weighted primary studies (14 support, 1 contradict). Evidence strength 52/100; moderate confidence. Verdict thresholds: two-thirds weighted support or opposition, otherwise Mixed; fewer than three directional studies = Unclear. Score arithmetic, classifications and confidence thresholds unchanged. No score was set by hand. Re-swept; no change to the published figures.

Substituting timber for mineral structural materials reduces the cradle-to-gate greenhouse gas emissions of a building.

WI-EV v1.6.0: Supported. Direction calculated from existing weighted primary studies (12 support, 0 contradict). Evidence strength 55/100; low confidence. Verdict thresholds: two-thirds weighted support or opposition, otherwise Mixed; fewer than three directional studies = Unclear. Score arithmetic, classifications and confidence thresholds unchanged. No score was set by hand. Re-swept; no change to the published figures.

Long-lived timber construction products deliver a net biogenic carbon storage benefit over the building service life.

WI-EV v1.6.0: Supported. Direction calculated from existing weighted primary studies (14 support, 2 contradict). Evidence strength 58/100; moderate confidence. Verdict thresholds: two-thirds weighted support or opposition, otherwise Mixed; fewer than three directional studies = Unclear. Score arithmetic, classifications and confidence thresholds unchanged. No score was set by hand. Re-swept; no change to the published figures.

Accelerated laboratory weathering tests reliably predict field performance of exterior wood coatings.

1 new study indexed.

Design detailing that keeps water off end grain affects the service life of exterior wood more than moving one EN 350 durability class.

WI-EV v1.5.0: tiers re-checked; above-ground field studies (EN 330, L-joint, lap-joint, double-layer, in-service surveys) are tier (a) for above-ground claims. 53 relevant primary studies, 0 directional (0 field in the claim's exposure). Evidence strength withheld: insufficient evidence. No score was set by hand. Re-swept; no change to the published figures.

Preservative-treated Scots pine sapwood reaches the intended service life in EN 335 use class 3 exposure.

WI-EV v1.5.0: tiers re-checked; above-ground field studies (EN 330, L-joint, lap-joint, double-layer, in-service surveys) are tier (a) for above-ground claims. 13 relevant primary studies, 0 directional (0 field in the claim's exposure). Evidence strength withheld: insufficient evidence. No score was set by hand. Re-swept; no change to the published figures.

Sustained wood moisture content above 25 percent is the controlling condition for fungal decay initiation in above-ground timber.

WI-EV v1.5.0: tiers re-checked; above-ground field studies (EN 330, L-joint, lap-joint, double-layer, in-service surveys) are tier (a) for above-ground claims. 48 relevant primary studies, 2 directional (1 field in the claim's exposure). Evidence strength withheld: insufficient evidence. No score was set by hand. 1 new study indexed.

Regular maintenance of a film-forming coating extends the service life of exterior timber cladding more than the initial coating choice does.

WI-EV v1.5.0: tiers re-checked; above-ground field studies (EN 330, L-joint, lap-joint, double-layer, in-service surveys) are tier (a) for above-ground claims. 53 relevant primary studies, 0 directional (0 field in the claim's exposure). Evidence strength withheld: insufficient evidence. No score was set by hand. Re-swept; no change to the published figures.

Mass timber assemblies carry a higher built-in moisture risk during construction than they do in service.

WI-EV v1.5.0: tiers re-checked; above-ground field studies (EN 330, L-joint, lap-joint, double-layer, in-service surveys) are tier (a) for above-ground claims. 47 relevant primary studies, 2 directional (1 field in the claim's exposure). Evidence strength withheld: insufficient evidence. No score was set by hand. Re-swept; no change to the published figures.

Untreated larch cladding reaches a service life comparable to surface-treated softwood in temperate Northern European climates.

WI-EV v1.5.0: tiers re-checked; above-ground field studies (EN 330, L-joint, lap-joint, double-layer, in-service surveys) are tier (a) for above-ground claims. 19 relevant primary studies, 0 directional (0 field in the claim's exposure). Evidence strength withheld: insufficient evidence. No score was set by hand. Re-swept; no change to the published figures.

Silicate-based surface treatments measurably slow the surface weathering of exterior softwood.

WI-EV v1.5.0: tiers re-checked; above-ground field studies (EN 330, L-joint, lap-joint, double-layer, in-service surveys) are tier (a) for above-ground claims. 4 relevant primary studies, 1 directional (1 field in the claim's exposure). Evidence strength withheld: insufficient evidence. No score was set by hand. Re-swept; no change to the published figures.

Charring rates of cross-laminated timber under standard fire exposure are predictable within the Eurocode 5 design assumptions.

WI-EV v1.5.0: method claim — studies re-tiered as validation against observed outcomes (0 directional), comparison with another model (0 directional) or application without validation (never directional, 0 relevant). Original source excluded from directional evidence (circularity rule): 0. 0 directional studies. Evidence strength withheld: insufficient evidence. No score was set by hand. Re-swept; no change to the published figures.

Acetylation reduces the moisture-driven dimensional movement of wood by more than half relative to the untreated species.

WI-EV v1.5.0: tiers re-checked; above-ground field studies (EN 330, L-joint, lap-joint, double-layer, in-service surveys) are tier (a) for above-ground claims. 20 relevant primary studies, 0 directional (0 field in the claim's exposure). Evidence strength withheld: insufficient evidence. No score was set by hand. Re-swept; no change to the published figures.

The Scheffer climate index is a reliable predictor of above-ground decay hazard across climate zones.

WI-EV v1.5.0: method claim — studies re-tiered as validation against observed outcomes (2 directional), comparison with another model (1 directional) or application without validation (never directional, 0 relevant). Original source excluded from directional evidence (circularity rule): 1. 3 directional studies. No score was set by hand. Re-swept; no change to the published figures.

Accelerated laboratory weathering tests reliably predict field performance of exterior wood coatings.

WI-EV v1.5.0: method claim — studies re-tiered as validation against observed outcomes (4 directional), comparison with another model (0 directional) or application without validation (never directional, 0 relevant). Original source excluded from directional evidence (circularity rule): 1. 4 directional studies. No score was set by hand. 1 new study indexed, Evidence strength -1 to 45.

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

WI-EV v1.5.0: tiers re-checked; above-ground field studies (EN 330, L-joint, lap-joint, double-layer, in-service surveys) are tier (a) for above-ground claims. 32 relevant primary studies, 15 directional (3 field in the claim's exposure). No score was set by hand. confidence low → moderate.

Substituting timber for mineral structural materials reduces the cradle-to-gate greenhouse gas emissions of a building.

WI-EV v1.5.0: tiers re-checked; above-ground field studies (EN 330, L-joint, lap-joint, double-layer, in-service surveys) are tier (a) for above-ground claims. 65 relevant primary studies, 12 directional (0 field in the claim's exposure). No score was set by hand. Re-swept; no change to the published figures.

Long-lived timber construction products deliver a net biogenic carbon storage benefit over the building service life.

WI-EV v1.5.0: tiers re-checked; above-ground field studies (EN 330, L-joint, lap-joint, double-layer, in-service surveys) are tier (a) for above-ground claims. 54 relevant primary studies, 16 directional (0 field in the claim's exposure). No score was set by hand. 1 new study indexed.

Design detailing that keeps water off end grain affects the service life of exterior wood more than moving one EN 350 durability class.

WI-EV v1.4.0: studies weighted by test type (field in the claim's exposure > field elsewhere > laboratory > mechanism), reviews moved out of the directional pool (16), 4 duplicate records merged. 54 relevant primary studies, 0 directional (0 field in the claim's exposure). Evidence strength withheld: insufficient evidence. No score was set by hand. Re-swept; no change to the published figures.

Regular maintenance of a film-forming coating extends the service life of exterior timber cladding more than the initial coating choice does.

WI-EV v1.4.0: studies weighted by test type (field in the claim's exposure > field elsewhere > laboratory > mechanism), reviews moved out of the directional pool (10), 9 duplicate records merged. 53 relevant primary studies, 0 directional (0 field in the claim's exposure). Evidence strength withheld: insufficient evidence. No score was set by hand. Re-swept; no change to the published figures.

Untreated larch cladding reaches a service life comparable to surface-treated softwood in temperate Northern European climates.

WI-EV v1.4.0: studies weighted by test type (field in the claim's exposure > field elsewhere > laboratory > mechanism), reviews moved out of the directional pool (4), 1 duplicate record merged. 19 relevant primary studies, 0 directional (0 field in the claim's exposure). Evidence strength withheld: insufficient evidence. No score was set by hand. Re-swept; no change to the published figures.

Charring rates of cross-laminated timber under standard fire exposure are predictable within the Eurocode 5 design assumptions.

WI-EV v1.4.0: studies weighted by test type (field in the claim's exposure > field elsewhere > laboratory > mechanism), reviews moved out of the directional pool (4), 0 duplicate records merged. 24 relevant primary studies, 0 directional (0 field in the claim's exposure). Evidence strength withheld: insufficient evidence. No score was set by hand. Re-swept; no change to the published figures.

Acetylation reduces the moisture-driven dimensional movement of wood by more than half relative to the untreated species.

WI-EV v1.4.0: studies weighted by test type (field in the claim's exposure > field elsewhere > laboratory > mechanism), reviews moved out of the directional pool (6), 2 duplicate records merged. 20 relevant primary studies, 0 directional (0 field in the claim's exposure). Evidence strength withheld: insufficient evidence. No score was set by hand. Re-swept; no change to the published figures.

Mass timber assemblies carry a higher built-in moisture risk during construction than they do in service.

WI-EV v1.4.0: studies weighted by test type (field in the claim's exposure > field elsewhere > laboratory > mechanism), reviews moved out of the directional pool (5), 3 duplicate records merged. 47 relevant primary studies, 2 directional (0 field in the claim's exposure). Evidence strength withheld: insufficient evidence. No score was set by hand. Re-swept; no change to the published figures.

Preservative-treated Scots pine sapwood reaches the intended service life in EN 335 use class 3 exposure.

WI-EV v1.4.0: studies weighted by test type (field in the claim's exposure > field elsewhere > laboratory > mechanism), reviews moved out of the directional pool (0), 5 duplicate records merged. 13 relevant primary studies, 0 directional (0 field in the claim's exposure). Evidence strength withheld: insufficient evidence. No score was set by hand. Re-swept; no change to the published figures.

Silicate-based surface treatments measurably slow the surface weathering of exterior softwood.

WI-EV v1.4.0: studies weighted by test type (field in the claim's exposure > field elsewhere > laboratory > mechanism), reviews moved out of the directional pool (3), 1 duplicate record merged. 4 relevant primary studies, 1 directional (1 field in the claim's exposure). Evidence strength withheld: insufficient evidence. No score was set by hand. Re-swept; no change to the published figures.

Accelerated laboratory weathering tests reliably predict field performance of exterior wood coatings.

WI-EV v1.4.0: studies weighted by test type (field in the claim's exposure > field elsewhere > laboratory > mechanism), reviews moved out of the directional pool (7), 4 duplicate records merged. 55 relevant primary studies, 4 directional (4 field in the claim's exposure). No score was set by hand. Evidence strength +2 to 46.

Sustained wood moisture content above 25 percent is the controlling condition for fungal decay initiation in above-ground timber.

WI-EV v1.4.0: studies weighted by test type (field in the claim's exposure > field elsewhere > laboratory > mechanism), reviews moved out of the directional pool (13), 1 duplicate record merged. 47 relevant primary studies, 2 directional (1 field in the claim's exposure). Evidence strength withheld: insufficient evidence. No score was set by hand. Re-swept; no change to the published figures.

The Scheffer climate index is a reliable predictor of above-ground decay hazard across climate zones.

WI-EV v1.4.0: studies weighted by test type (field in the claim's exposure > field elsewhere > laboratory > mechanism), reviews moved out of the directional pool (8), 0 duplicate records merged. 42 relevant primary studies, 3 directional (1 field in the claim's exposure). No score was set by hand. Evidence strength -3 to 45.

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

WI-EV v1.4.0: studies weighted by test type (field in the claim's exposure > field elsewhere > laboratory > mechanism), reviews moved out of the directional pool (9), 3 duplicate records merged. 32 relevant primary studies, 15 directional (3 field in the claim's exposure). No score was set by hand. Evidence strength -11 to 52, consensus 99% → 98%, confidence moderate → low.

Substituting timber for mineral structural materials reduces the cradle-to-gate greenhouse gas emissions of a building.

WI-EV v1.4.0: studies weighted by test type (field in the claim's exposure > field elsewhere > laboratory > mechanism), reviews moved out of the directional pool (16), 2 duplicate records merged. 65 relevant primary studies, 12 directional (0 field in the claim's exposure). No score was set by hand. Evidence strength -15 to 55, confidence moderate → low.

Long-lived timber construction products deliver a net biogenic carbon storage benefit over the building service life.

WI-EV v1.4.0: studies weighted by test type (field in the claim's exposure > field elsewhere > laboratory > mechanism), reviews moved out of the directional pool (14), 3 duplicate records merged. 53 relevant primary studies, 16 directional (0 field in the claim's exposure). No score was set by hand. Evidence strength -15 to 58, consensus 87% → 85%.

Regular maintenance of a film-forming coating extends the service life of exterior timber cladding more than the initial coating choice does.

28 new studies indexed.

Charring rates of cross-laminated timber under standard fire exposure are predictable within the Eurocode 5 design assumptions.

3 new studies indexed.

Preservative-treated Scots pine sapwood reaches the intended service life in EN 335 use class 3 exposure.

1 new study indexed.

Mass timber assemblies carry a higher built-in moisture risk during construction than they do in service.

2 new studies indexed.

Design detailing that keeps water off end grain affects the service life of exterior wood more than moving one EN 350 durability class.

13 new studies indexed.

Silicate-based surface treatments measurably slow the surface weathering of exterior softwood.

2 new studies indexed.

Accelerated laboratory weathering tests reliably predict field performance of exterior wood coatings.

13 new studies indexed, Evidence strength +1 to 44.

Sustained wood moisture content above 25 percent is the controlling condition for fungal decay initiation in above-ground timber.

4 new studies indexed.

The Scheffer climate index is a reliable predictor of above-ground decay hazard across climate zones.

5 new studies indexed, Evidence strength -1 to 48.

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

5 new studies indexed, Evidence strength +7 to 63, consensus 98% → 99%.

Substituting timber for mineral structural materials reduces the cradle-to-gate greenhouse gas emissions of a building.

19 new studies indexed, Evidence strength +3 to 70.

Long-lived timber construction products deliver a net biogenic carbon storage benefit over the building service life.

5 new studies indexed, Evidence strength +2 to 73, consensus 86% → 87%.

Substituting timber for mineral structural materials reduces the cradle-to-gate greenhouse gas emissions of a building.

30 new studies indexed, Evidence strength +4 to 67.

Untreated larch cladding reaches a service life comparable to surface-treated softwood in temperate Northern European climates.

16 new studies indexed.

Long-lived timber construction products deliver a net biogenic carbon storage benefit over the building service life.

28 new studies indexed, Evidence strength +6 to 71, consensus 83% → 86%.

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

22 new studies indexed, consensus 100% → 98%, confidence low → moderate.

Silicate-based surface treatments measurably slow the surface weathering of exterior softwood.

4 new studies indexed.

The Scheffer climate index is a reliable predictor of above-ground decay hazard across climate zones.

28 new studies indexed, Evidence strength +49 to 49.

Preservative-treated Scots pine sapwood reaches the intended service life in EN 335 use class 3 exposure.

9 new studies indexed.

Sustained wood moisture content above 25 percent is the controlling condition for fungal decay initiation in above-ground timber.

44 new studies indexed, Evidence strength +46 to 46.

Mass timber assemblies carry a higher built-in moisture risk during construction than they do in service.

20 new studies indexed.

Design detailing that keeps water off end grain affects the service life of exterior wood more than moving one EN 350 durability class.

41 new studies indexed.

Regular maintenance of a film-forming coating extends the service life of exterior timber cladding more than the initial coating choice does.

28 new studies indexed.

Charring rates of cross-laminated timber under standard fire exposure are predictable within the Eurocode 5 design assumptions.

15 new studies indexed.

Acetylation reduces the moisture-driven dimensional movement of wood by more than half relative to the untreated species.

18 new studies indexed.

Accelerated laboratory weathering tests reliably predict field performance of exterior wood coatings.

34 new studies indexed, Evidence strength +6 to 43, consensus 17% → 8%.

Substituting timber for mineral structural materials reduces the cradle-to-gate greenhouse gas emissions of a building.

WI-EV v1.3.0 recall expansion: expanded query set, IRG-WP documents and OpenAlex citation chaining; every new record passed the same wood-domain rule and relevance classifier. 33 relevant studies, 8 directional. No score was set by hand. 9 new studies indexed, Evidence strength +6 to 63, confidence low → moderate.

Untreated larch cladding reaches a service life comparable to surface-treated softwood in temperate Northern European climates.

WI-EV v1.3.0 recall expansion: expanded query set, IRG-WP documents and OpenAlex citation chaining; every new record passed the same wood-domain rule and relevance classifier. 7 relevant studies, 0 directional. Evidence strength withheld: insufficient evidence. No score was set by hand. 2 new studies indexed.

Long-lived timber construction products deliver a net biogenic carbon storage benefit over the building service life.

WI-EV v1.3.0 recall expansion: expanded query set, IRG-WP documents and OpenAlex citation chaining; every new record passed the same wood-domain rule and relevance classifier. 37 relevant studies, 14 directional. No score was set by hand. 11 new studies indexed, Evidence strength +5 to 65, consensus 100% → 83%, confidence low → moderate.

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

WI-EV v1.3.0 recall expansion: expanded query set, IRG-WP documents and OpenAlex citation chaining; every new record passed the same wood-domain rule and relevance classifier. 15 relevant studies, 6 directional. No score was set by hand. 3 new studies indexed, Evidence strength +1 to 56.

The Scheffer climate index is a reliable predictor of above-ground decay hazard across climate zones.

WI-EV v1.3.0 recall expansion: expanded query set, IRG-WP documents and OpenAlex citation chaining; every new record passed the same wood-domain rule and relevance classifier. 17 relevant studies, 2 directional. Evidence strength withheld: insufficient evidence. No score was set by hand. 1 new study indexed.

Preservative-treated Scots pine sapwood reaches the intended service life in EN 335 use class 3 exposure.

WI-EV v1.3.0 recall expansion: expanded query set, IRG-WP documents and OpenAlex citation chaining; every new record passed the same wood-domain rule and relevance classifier. 3 relevant studies, 0 directional. Evidence strength withheld: insufficient evidence. No score was set by hand. 2 new studies indexed.

Sustained wood moisture content above 25 percent is the controlling condition for fungal decay initiation in above-ground timber.

WI-EV v1.3.0 recall expansion: expanded query set, IRG-WP documents and OpenAlex citation chaining; every new record passed the same wood-domain rule and relevance classifier. 13 relevant studies, 2 directional. Evidence strength withheld: insufficient evidence. No score was set by hand. 7 new studies indexed.

Mass timber assemblies carry a higher built-in moisture risk during construction than they do in service.

WI-EV v1.3.0 recall expansion: expanded query set, IRG-WP documents and OpenAlex citation chaining; every new record passed the same wood-domain rule and relevance classifier. 32 relevant studies, 1 directional. Evidence strength withheld: insufficient evidence. No score was set by hand. 10 new studies indexed.

Design detailing that keeps water off end grain affects the service life of exterior wood more than moving one EN 350 durability class.

WI-EV v1.3.0 recall expansion: expanded query set, IRG-WP documents and OpenAlex citation chaining; every new record passed the same wood-domain rule and relevance classifier. 18 relevant studies, 0 directional. Evidence strength withheld: insufficient evidence. No score was set by hand. 9 new studies indexed.

Regular maintenance of a film-forming coating extends the service life of exterior timber cladding more than the initial coating choice does.

WI-EV v1.3.0 recall expansion: expanded query set, IRG-WP documents and OpenAlex citation chaining; every new record passed the same wood-domain rule and relevance classifier. 8 relevant studies, 0 directional. Evidence strength withheld: insufficient evidence. No score was set by hand. 6 new studies indexed.

Charring rates of cross-laminated timber under standard fire exposure are predictable within the Eurocode 5 design assumptions.

WI-EV v1.3.0 recall expansion: expanded query set, IRG-WP documents and OpenAlex citation chaining; every new record passed the same wood-domain rule and relevance classifier. 10 relevant studies, 0 directional. Evidence strength withheld: insufficient evidence. No score was set by hand. 3 new studies indexed.

Acetylation reduces the moisture-driven dimensional movement of wood by more than half relative to the untreated species.

WI-EV v1.3.0 recall expansion: expanded query set, IRG-WP documents and OpenAlex citation chaining; every new record passed the same wood-domain rule and relevance classifier. 8 relevant studies, 0 directional. Evidence strength withheld: insufficient evidence. No score was set by hand. 1 new study indexed.

Accelerated laboratory weathering tests reliably predict field performance of exterior wood coatings.

WI-EV v1.3.0 recall expansion: expanded query set, IRG-WP documents and OpenAlex citation chaining; every new record passed the same wood-domain rule and relevance classifier. 18 relevant studies, 3 directional. No score was set by hand. 5 new studies indexed, Evidence strength +37 to 37, consensus 50% → 17%.

Silicate-based surface treatments measurably slow the surface weathering of exterior softwood.

WI-EV v1.3.0 recall expansion: expanded query set, IRG-WP documents and OpenAlex citation chaining; every new record passed the same wood-domain rule and relevance classifier. 1 relevant study, 1 directional. Evidence strength withheld: insufficient evidence. No score was set by hand. 1 new study indexed.

Long-lived timber construction products deliver a net biogenic carbon storage benefit over the building service life.

Evidence strength +1 to 60.

Sustained wood moisture content above 25 percent is the controlling condition for fungal decay initiation in above-ground timber.

Re-swept; no change to the published figures.

Acetylation reduces the moisture-driven dimensional movement of wood by more than half relative to the untreated species.

Re-swept; no change to the published figures.

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

Evidence strength +1 to 55.

Substituting timber for mineral structural materials reduces the cradle-to-gate greenhouse gas emissions of a building.

Evidence strength +2 to 57.

Preservative-treated Scots pine sapwood reaches the intended service life in EN 335 use class 3 exposure.

WI-EV v1.2.0 relevance fix: 16 of 17 previously counted studies removed as not relevant (reasons kept in the public audit log); 1 relevant study remains, 0 directional. Evidence strength withheld: insufficient evidence.

Regular maintenance of a film-forming coating extends the service life of exterior timber cladding more than the initial coating choice does.

WI-EV v1.2.0 relevance fix: 22 of 24 previously counted studies removed as not relevant (reasons kept in the public audit log); 2 relevant studies remain, 0 directional. Evidence strength withheld: insufficient evidence.

Design detailing that keeps water off end grain affects the service life of exterior wood more than moving one EN 350 durability class.

WI-EV v1.2.0 relevance fix: 18 of 27 previously counted studies removed as not relevant (reasons kept in the public audit log); 9 relevant studies remain, 0 directional. Evidence strength withheld: insufficient evidence.

Untreated larch cladding reaches a service life comparable to surface-treated softwood in temperate Northern European climates.

WI-EV v1.2.0 relevance fix: 35 of 40 previously counted studies removed as not relevant (reasons kept in the public audit log); 5 relevant studies remain, 0 directional. Evidence strength withheld: insufficient evidence.

Accelerated laboratory weathering tests reliably predict field performance of exterior wood coatings.

WI-EV v1.2.0 relevance fix: 30 of 43 previously counted studies removed as not relevant (reasons kept in the public audit log); 13 relevant studies remain, 2 directional. Evidence strength withheld: insufficient evidence.

Silicate-based surface treatments measurably slow the surface weathering of exterior softwood.

WI-EV v1.2.0 relevance fix: 29 of 29 previously counted studies removed as not relevant (reasons kept in the public audit log); 0 relevant studies remain, 0 directional. Evidence strength withheld: insufficient evidence.

Sustained wood moisture content above 25 percent is the controlling condition for fungal decay initiation in above-ground timber.

WI-EV v1.2.0 relevance fix: 16 of 23 previously counted studies removed as not relevant (reasons kept in the public audit log); 7 relevant studies remain, 1 directional. Evidence strength withheld: insufficient evidence.

Acetylation reduces the moisture-driven dimensional movement of wood by more than half relative to the untreated species.

WI-EV v1.2.0 relevance fix: 33 of 41 previously counted studies removed as not relevant (reasons kept in the public audit log); 8 relevant studies remain, 0 directional. Evidence strength withheld: insufficient evidence.

Charring rates of cross-laminated timber under standard fire exposure are predictable within the Eurocode 5 design assumptions.

WI-EV v1.2.0 relevance fix: 30 of 37 previously counted studies removed as not relevant (reasons kept in the public audit log); 7 relevant studies remain, 0 directional. Evidence strength withheld: insufficient evidence.

Mass timber assemblies carry a higher built-in moisture risk during construction than they do in service.

WI-EV v1.2.0 relevance fix: 3 of 25 previously counted studies removed as not relevant (reasons kept in the public audit log); 22 relevant studies remain, 1 directional. Evidence strength withheld: insufficient evidence.