{
  "api": "woodintel",
  "version": "1.0.0",
  "license": "CC BY 4.0 — WoodIntel (woodintel.io)",
  "attribution": "WoodIntel — woodintel.io",
  "generated": "2026-08-04T16:06:59.447Z",
  "count": 6,
  "method": {
    "id": "WI-GAP",
    "version": "1.0.0"
  },
  "note": "Gap score = 0.35 thin record + 0.25 unresolved dissent + 0.20 ageing evidence + 0.20 low evidence score. A high score means the open literature cannot currently settle the claim; it is not a verdict on the claim.",
  "data": [
    {
      "slug": "thermal-modification-durability",
      "statement": "Thermal modification measurably increases the decay resistance of softwood in above-ground exterior use.",
      "subject": "Thermal modification",
      "topic": "Modification",
      "evidenceScore": 61,
      "studyCount": 14,
      "contradicting": 0,
      "lastStudyYear": 2022,
      "gapScore": 16,
      "priority": "low",
      "question": "A replication under current test standards; the most recent indexed work on Thermal modification is from 2022.",
      "factors": [
        {
          "key": "thinness",
          "label": "Thin record",
          "value": 0,
          "weight": 0.35,
          "note": "14 indexed studies against a reference of 12."
        },
        {
          "key": "dissent",
          "label": "Unresolved dissent",
          "value": 0,
          "weight": 0.25,
          "note": "No records classified for or against yet."
        },
        {
          "key": "staleness",
          "label": "Ageing evidence",
          "value": 40,
          "weight": 0.2,
          "note": "Most recent indexed study: 2022 (4 years ago)."
        },
        {
          "key": "softness",
          "label": "Low evidence score",
          "value": 39,
          "weight": 0.2,
          "note": "Evidence Score 61/100."
        }
      ],
      "url": "https://woodintel.io/evidence/thermal-modification-durability"
    },
    {
      "slug": "acetylation-dimensional-stability",
      "statement": "Acetylation reduces the moisture-driven dimensional movement of wood by more than half relative to the untreated species.",
      "subject": "Acetylation",
      "topic": "Modification",
      "evidenceScore": 58,
      "studyCount": 14,
      "contradicting": 0,
      "lastStudyYear": 2022,
      "gapScore": 16,
      "priority": "low",
      "question": "Higher-grade evidence on Acetylation — controlled or long-run field work rather than the present mix.",
      "factors": [
        {
          "key": "thinness",
          "label": "Thin record",
          "value": 0,
          "weight": 0.35,
          "note": "14 indexed studies against a reference of 12."
        },
        {
          "key": "dissent",
          "label": "Unresolved dissent",
          "value": 0,
          "weight": 0.25,
          "note": "No records classified for or against yet."
        },
        {
          "key": "staleness",
          "label": "Ageing evidence",
          "value": 40,
          "weight": 0.2,
          "note": "Most recent indexed study: 2022 (4 years ago)."
        },
        {
          "key": "softness",
          "label": "Low evidence score",
          "value": 42,
          "weight": 0.2,
          "note": "Evidence Score 58/100."
        }
      ],
      "url": "https://woodintel.io/evidence/acetylation-dimensional-stability"
    },
    {
      "slug": "clt-charring-rate-predictability",
      "statement": "Charring rates of cross-laminated timber under standard fire exposure are predictable within the Eurocode 5 design assumptions.",
      "subject": "CLT fire",
      "topic": "Fire",
      "evidenceScore": 51,
      "studyCount": 14,
      "contradicting": 0,
      "lastStudyYear": 2023,
      "gapScore": 16,
      "priority": "low",
      "question": "Higher-grade evidence on CLT fire — controlled or long-run field work rather than the present mix.",
      "factors": [
        {
          "key": "thinness",
          "label": "Thin record",
          "value": 0,
          "weight": 0.35,
          "note": "14 indexed studies against a reference of 12."
        },
        {
          "key": "dissent",
          "label": "Unresolved dissent",
          "value": 0,
          "weight": 0.25,
          "note": "No records classified for or against yet."
        },
        {
          "key": "staleness",
          "label": "Ageing evidence",
          "value": 30,
          "weight": 0.2,
          "note": "Most recent indexed study: 2023 (3 years ago)."
        },
        {
          "key": "softness",
          "label": "Low evidence score",
          "value": 49,
          "weight": 0.2,
          "note": "Evidence Score 51/100."
        }
      ],
      "url": "https://woodintel.io/evidence/clt-charring-rate-predictability"
    },
    {
      "slug": "scheffer-index-decay-prediction",
      "statement": "The Scheffer climate index is a reliable predictor of above-ground decay hazard across climate zones.",
      "subject": "Decay modelling",
      "topic": "Modelling",
      "evidenceScore": 54,
      "studyCount": 14,
      "contradicting": 0,
      "lastStudyYear": 2024,
      "gapScore": 13,
      "priority": "low",
      "question": "Higher-grade evidence on Decay modelling — controlled or long-run field work rather than the present mix.",
      "factors": [
        {
          "key": "thinness",
          "label": "Thin record",
          "value": 0,
          "weight": 0.35,
          "note": "14 indexed studies against a reference of 12."
        },
        {
          "key": "dissent",
          "label": "Unresolved dissent",
          "value": 0,
          "weight": 0.25,
          "note": "No records classified for or against yet."
        },
        {
          "key": "staleness",
          "label": "Ageing evidence",
          "value": 20,
          "weight": 0.2,
          "note": "Most recent indexed study: 2024 (2 years ago)."
        },
        {
          "key": "softness",
          "label": "Low evidence score",
          "value": 46,
          "weight": 0.2,
          "note": "Evidence Score 54/100."
        }
      ],
      "url": "https://woodintel.io/evidence/scheffer-index-decay-prediction"
    },
    {
      "slug": "untreated-larch-service-life",
      "statement": "Untreated larch cladding reaches a service life comparable to surface-treated softwood in temperate Northern European climates.",
      "subject": "Larch",
      "topic": "Service life",
      "evidenceScore": 47,
      "studyCount": 14,
      "contradicting": 0,
      "lastStudyYear": 2025,
      "gapScore": 13,
      "priority": "low",
      "question": "Higher-grade evidence on Larch — controlled or long-run field work rather than the present mix.",
      "factors": [
        {
          "key": "thinness",
          "label": "Thin record",
          "value": 0,
          "weight": 0.35,
          "note": "14 indexed studies against a reference of 12."
        },
        {
          "key": "dissent",
          "label": "Unresolved dissent",
          "value": 0,
          "weight": 0.25,
          "note": "No records classified for or against yet."
        },
        {
          "key": "staleness",
          "label": "Ageing evidence",
          "value": 10,
          "weight": 0.2,
          "note": "Most recent indexed study: 2025 (1 year ago)."
        },
        {
          "key": "softness",
          "label": "Low evidence score",
          "value": 53,
          "weight": 0.2,
          "note": "Evidence Score 47/100."
        }
      ],
      "url": "https://woodintel.io/evidence/untreated-larch-service-life"
    },
    {
      "slug": "timber-biogenic-carbon-storage",
      "statement": "Long-lived timber construction products deliver a net biogenic carbon storage benefit over the building service life.",
      "subject": "Carbon",
      "topic": "Sustainability",
      "evidenceScore": 63,
      "studyCount": 14,
      "contradicting": 0,
      "lastStudyYear": 2024,
      "gapScore": 11,
      "priority": "low",
      "question": "Higher-grade evidence on Carbon — controlled or long-run field work rather than the present mix.",
      "factors": [
        {
          "key": "thinness",
          "label": "Thin record",
          "value": 0,
          "weight": 0.35,
          "note": "14 indexed studies against a reference of 12."
        },
        {
          "key": "dissent",
          "label": "Unresolved dissent",
          "value": 0,
          "weight": 0.25,
          "note": "0 of 2 classified records contradict the conclusion."
        },
        {
          "key": "staleness",
          "label": "Ageing evidence",
          "value": 20,
          "weight": 0.2,
          "note": "Most recent indexed study: 2024 (2 years ago)."
        },
        {
          "key": "softness",
          "label": "Low evidence score",
          "value": 37,
          "weight": 0.2,
          "note": "Evidence Score 63/100."
        }
      ],
      "url": "https://woodintel.io/evidence/timber-biogenic-carbon-storage"
    }
  ]
}