{
  "brand": "Kingspan",
  "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": "tp10",
      "name": "Kingspan Thermapitch TP10",
      "material_class": "PIR rigid board",
      "application": "Pitched roof",
      "source": "tp10",
      "range_source": "tp10",
      "thickness_mm": [
        25,
        30,
        40,
        50,
        60,
        70,
        75,
        80,
        90,
        100,
        110,
        120,
        125,
        130,
        140,
        150
      ],
      "lambda_w_mk": [
        0.022,
        0.022,
        0.022,
        0.022,
        0.022,
        0.022,
        0.022,
        0.022,
        0.022,
        0.022,
        0.022,
        0.022,
        0.022,
        0.022,
        0.022,
        0.022
      ],
      "declared_r": [
        1.1,
        1.35,
        1.8,
        2.25,
        2.7,
        3.15,
        3.4,
        3.6,
        4.05,
        4.5,
        5,
        5.45,
        5.65,
        5.9,
        6.35,
        6.8
      ],
      "note": "UK brochure thicknesses, not a live stock list. Thermal properties are not installation approval."
    },
    {
      "id": "k108",
      "name": "Kingspan Kooltherm K108",
      "material_class": "Phenolic rigid board",
      "application": "Partial-fill cavity wall",
      "source": "k108",
      "range_source": "k108-product",
      "thickness_mm": [
        25,
        30,
        40,
        50,
        60,
        70,
        75,
        80,
        90,
        100,
        110,
        120,
        130,
        140,
        150
      ],
      "lambda_w_mk": [
        0.019,
        0.019,
        0.019,
        0.019,
        0.019,
        0.019,
        0.019,
        0.019,
        0.019,
        0.019,
        0.019,
        0.019,
        0.019,
        0.019,
        0.019
      ],
      "declared_r": [
        1.3,
        1.55,
        2.1,
        2.6,
        3.15,
        3.65,
        3.9,
        4.2,
        4.7,
        5.25,
        5.75,
        6.3,
        6.8,
        7.35,
        7.85
      ],
      "note": "Current UK DoP issue 003 controls λD 0.019 and the listed thickness/R pairs. The product page identifies K108 as partial-fill cavity-wall insulation."
    }
  ],
  "sources": {
    "tp10": {
      "title": "Kingspan Thermapitch TP10 GB brochure, page 5",
      "url": "https://www.kingspan.com/content/dam/kingspan/kil/products/thermapitch-tp10-gb-and-ireland/kingspan-thermapitch-tp10-brochure-en-gb.pdf"
    },
    "k108": {
      "title": "Kingspan Kooltherm K108 UK Declaration of Performance 1000.UKDoP.K108.003",
      "url": "https://www.kingspan.com/content/dam/kingspan/kil/products/kooltherm-k108-gb-and-ireland/kingspan-kooltherm-k108-declaration-of-performance-1000-ukdop-en-gb.pdf"
    },
    "k108-product": {
      "title": "Kingspan Kooltherm K108 Cavity Board UK product page",
      "url": "https://www.insulation.kingspan.com/gb/en/products/insulation-boards/wall-insulation-boards/kooltherm-k108-cavity-board"
    }
  }
}