{
  "brand": "Celotex / SOPRATHERM",
  "checked_date": "2026-08-29",
  "version": "2026-08-29.1",
  "scope": "Steady-state plane layers, optionally one repeating timber layer. Excludes metal framing, ground-coupled floors, windows, junction psi values, moisture and fire design. No automatic fastener, air-gap or inverted-roof correction. Not a compliance certificate.",
  "reuse": "Original calculations and selection: CC BY 4.0, attribute Inzonex and link this page. Manufacturer property facts remain attributed to their sources; no rights are granted over manufacturer documents, images or trademarks. Not a manufacturer-endorsed calculator.",
  "products": [
    {
      "id": "ga4000",
      "name": "SOPRATHERM GA4000 (previously Celotex)",
      "material_class": "PIR rigid board",
      "application": "Pitched roof, dry lining and floor",
      "source": "ga4000",
      "range_source": "ga4000",
      "thickness_mm": [
        50,
        60,
        70,
        75,
        80,
        90,
        100
      ],
      "lambda_w_mk": [
        0.022,
        0.022,
        0.022,
        0.022,
        0.022,
        0.022,
        0.022
      ],
      "declared_r": [
        2.25,
        2.7,
        3.15,
        3.4,
        3.6,
        4.05,
        4.5
      ],
      "note": "Technical sheet controls these values. The captured product-page 100 mm R of 5.50 conflicts with the sheet's 4.50; it is not used."
    }
  ],
  "sources": {
    "ga4000": {
      "title": "SOPRATHERM GA4000 technical data sheet TDS-UK-INSUK0025.a/EN",
      "url": "https://my.assets-library.com/asset/c9934f2b-78e7-4832-b26e-e4433d1b6e19/TDS-SOPRATHERM-GA4000.pdf"
    }
  }
}