{
  "version": "knauf-dritherm-2026-08-30.1",
  "checked_date": "2026-08-30",
  "geography": "United Kingdom",
  "source": {
    "id": "knauf-dritherm-aug2025",
    "title": "Knauf Insulation DriTherm Cavity Slabs 32, 34 and 37: August 2025 datasheet, page 2",
    "url": "https://knauf.com/api/download-center/v1/assets/82368a30-7835-4428-9656-fdc0a7532bc9?country=gb&download=true",
    "sha256": "387baa827291bf957c7791afb7c2726504a85a2c737a08463c5b4a20ae6f712e",
    "valid_from": "2025-08",
    "page": 2,
    "application_pages": [
      1,
      4
    ]
  },
  "scope": "Nominal listed product sizes for full-fill external masonry cavity walls. Conductivity and resistance are product properties, not a whole-wall U-value, installation approval or performance guarantee.",
  "products": [
    {
      "id": "dritherm32",
      "name": "Knauf DriTherm Cavity Slab 32",
      "material_class": "Glass mineral wool slab",
      "application": "Full-fill external masonry cavity wall",
      "source": "knauf-dritherm-aug2025",
      "range_source": "knauf-dritherm-aug2025",
      "thickness_mm": [
        75,
        85,
        100,
        125,
        150
      ],
      "lambda_w_mk": [
        0.032,
        0.032,
        0.032,
        0.032,
        0.032
      ],
      "declared_r": [
        2.3,
        2.65,
        3.1,
        3.9,
        4.65
      ],
      "product_codes": [
        "715827",
        "715830",
        "715829",
        "715828",
        "580216"
      ],
      "note": "The 100 mm thermal table lists R 3.10; the EPD footnote on the same page says 3.15. Retain the thermal-table value and disclose this source inconsistency. Calculated t/lambda is 3.125; do not silently substitute either published value."
    },
    {
      "id": "dritherm34",
      "name": "Knauf DriTherm Cavity Slab 34",
      "material_class": "Glass mineral wool slab",
      "application": "Full-fill external masonry cavity wall",
      "source": "knauf-dritherm-aug2025",
      "range_source": "knauf-dritherm-aug2025",
      "thickness_mm": [
        75,
        100,
        125,
        150
      ],
      "lambda_w_mk": [
        0.034,
        0.034,
        0.034,
        0.034
      ],
      "declared_r": [
        2.2,
        2.9,
        3.65,
        4.4
      ],
      "product_codes": [
        "715833",
        "715832",
        "715836",
        "715834"
      ],
      "note": "Listed sizes only. Calculated resistance uses unrounded thickness divided by conductivity; declared resistance is retained separately."
    },
    {
      "id": "dritherm37",
      "name": "Knauf DriTherm Cavity Slab 37",
      "material_class": "Glass mineral wool slab",
      "application": "Full-fill external masonry cavity wall",
      "source": "knauf-dritherm-aug2025",
      "range_source": "knauf-dritherm-aug2025",
      "thickness_mm": [
        50,
        65,
        75,
        85,
        100,
        125,
        150
      ],
      "lambda_w_mk": [
        0.037,
        0.037,
        0.037,
        0.037,
        0.037,
        0.037,
        0.037
      ],
      "declared_r": [
        1.35,
        1.75,
        2.0,
        2.25,
        2.7,
        3.35,
        4.05
      ],
      "product_codes": [
        "316650",
        "316652",
        "316654",
        "316656",
        "715831",
        "316660",
        "715835"
      ],
      "note": "Listed sizes only. No extrapolation to unlisted thicknesses, no pipe or high-temperature application inferred."
    }
  ],
  "conflicts": [
    {
      "product_id": "dritherm32",
      "thickness_mm": 100,
      "thermal_table_r": 3.1,
      "epd_footnote_r": 3.15,
      "calculated_r": 3.125,
      "disposition": "Use thermal table for declared_R and t/lambda for calculated_R; publish the discrepancy. GWP figures remain excluded pending a separate EPD boundary review."
    }
  ],
  "reuse": "Original selection and calculations may be reused with attribution to Inzonex. Manufacturer facts must retain Knauf source attribution. No rights are granted over the upstream PDF, images, logos, trademarks or program code."
}