{
  "page": "/us/lifespan/skylight",
  "built_from": "data/lifespan/facts/skylight.json",
  "rows": [
    {
      "type": "glass failure",
      "measure": "Condensation between panes identifies glass-unit failure",
      "value": null,
      "unit": "statement",
      "source": "DOE Building Science Education",
      "url": "https://bsesc.energy.gov/energy-basics/replacing-existing-skylights",
      "data_years": "undated guidance",
      "read": "2026-11-02",
      "area": "US",
      "n": "not published by the source",
      "se_points": null,
      "fact_id": "skylight-glass-failure"
    },
    {
      "type": "frame leak",
      "measure": "Water leakage at framing joints",
      "value": null,
      "unit": "statement",
      "source": "DOE Building Science Education",
      "url": "https://bsesc.energy.gov/energy-basics/replacing-existing-skylights",
      "data_years": "undated guidance",
      "read": "2026-11-02",
      "area": "US",
      "n": "not published by the source",
      "se_points": null,
      "fact_id": "skylight-frame-leak"
    },
    {
      "type": "gasket leak",
      "measure": "Missing, damaged or worn gasket material",
      "value": null,
      "unit": "statement",
      "source": "DOE Building Science Education",
      "url": "https://bsesc.energy.gov/energy-basics/replacing-existing-skylights",
      "data_years": "undated guidance",
      "read": "2026-11-02",
      "area": "US",
      "n": "not published by the source",
      "se_points": null,
      "fact_id": "skylight-gasket-leak"
    },
    {
      "type": "flashing",
      "measure": "Inspect flashing and water-management details",
      "value": null,
      "unit": "statement",
      "source": "DOE Building Science Education",
      "url": "https://bsesc.energy.gov/energy-basics/replacing-existing-skylights",
      "data_years": "undated guidance",
      "read": "2026-11-02",
      "area": "US",
      "n": "not published by the source",
      "se_points": null,
      "fact_id": "skylight-flashing"
    },
    {
      "type": "weathering",
      "measure": "Weathering and improper installation can allow leaks",
      "value": null,
      "unit": "statement",
      "source": "DOE Building Science Education",
      "url": "https://bsesc.energy.gov/energy-basics/replacing-existing-skylights",
      "data_years": "undated guidance",
      "read": "2026-11-02",
      "area": "US",
      "n": "not published by the source",
      "se_points": null,
      "fact_id": "skylight-weathering"
    },
    {
      "type": "annual wood",
      "measure": "Inspect pre-finished wood frames annually",
      "value": null,
      "unit": "statement",
      "source": "VELUX maintenance guidance",
      "url": "https://www.veluxsolutions.com/solutions_website/maintenance.html",
      "data_years": "undated guidance",
      "read": "2026-11-02",
      "area": "US",
      "n": "not published by the source",
      "se_points": null,
      "fact_id": "skylight-annual-wood"
    },
    {
      "type": "bare wood",
      "measure": "Finish unfinished wood within this interval after installation",
      "value": 6,
      "unit": "months",
      "source": "VELUX maintenance guidance",
      "url": "https://www.veluxsolutions.com/solutions_website/maintenance.html",
      "data_years": "undated guidance",
      "read": "2026-11-02",
      "area": "US",
      "n": "not published by the source",
      "se_points": null,
      "fact_id": "skylight-bare-wood"
    },
    {
      "type": "debris",
      "measure": "Keep debris away and grouped-unit gutters clear",
      "value": null,
      "unit": "statement",
      "source": "VELUX maintenance guidance",
      "url": "https://www.veluxsolutions.com/solutions_website/maintenance.html",
      "data_years": "undated guidance",
      "read": "2026-11-02",
      "area": "US",
      "n": "not published by the source",
      "se_points": null,
      "fact_id": "skylight-debris"
    },
    {
      "type": "condensation",
      "measure": "Warm moist air meeting cool glass creates condensation",
      "value": null,
      "unit": "statement",
      "source": "VELUX maintenance guidance",
      "url": "https://www.veluxsolutions.com/solutions_website/maintenance.html",
      "data_years": "undated guidance",
      "read": "2026-11-02",
      "area": "US",
      "n": "not published by the source",
      "se_points": null,
      "fact_id": "skylight-condensation"
    },
    {
      "type": "serial",
      "measure": "Use skylight serial number to identify replacement parts",
      "value": null,
      "unit": "statement",
      "source": "VELUX maintenance guidance",
      "url": "https://www.veluxsolutions.com/solutions_website/maintenance.html",
      "data_years": "undated guidance",
      "read": "2026-11-02",
      "area": "US",
      "n": "not published by the source",
      "se_points": null,
      "fact_id": "skylight-serial"
    }
  ]
}