{
  "rows": [
    {
      "fact_id": "flat-roof-hud2000-built-up-life",
      "type": "Built-up roofing in residential buildings",
      "measure": "Usually about; conditional 2000 residential guidance",
      "value": "20",
      "value_high": "",
      "unit": "years",
      "area": "national",
      "data_years": "2000 guide; lifetime data years not published",
      "source": "HUD residential inspection guide (2000)",
      "url": "https://www.huduser.gov/Publications/pdf/rehabinspect_2.pdf",
      "read": "2026-11-02",
      "n": "not published by the source",
      "se_points": ""
    },
    {
      "fact_id": "flat-roof-hud2000-single-ply-life",
      "type": "Single-ply membrane roofing",
      "measure": "If properly installed and properly maintained",
      "value": "20",
      "value_high": "",
      "unit": "years",
      "area": "national",
      "data_years": "2000 guide; lifetime data years not published",
      "source": "HUD residential inspection guide (2000)",
      "url": "https://www.huduser.gov/Publications/pdf/rehabinspect_2.pdf",
      "read": "2026-11-02",
      "n": "not published by the source",
      "se_points": ""
    }
  ]
}