{
  "id": "disaster/wildfire-sprinkler-roof-myth",
  "signature": "AI advises running a sprinkler on the roof during a wildfire (water pressure loss and ember ignition risk)",
  "signature_zh": "AI 建议在野火期间开启屋顶洒水器（水压损失和余烬点燃风险）",
  "regex": "sprinkler.*roof.*wildfire|roof.*sprinkler.*fire|water.*roof.*wildfire.*protection",
  "domain": "disaster",
  "category": "life_threatening",
  "subcategory": null,
  "root_cause": "Roof sprinklers during a wildfire can depressurize the municipal water system, leaving fire hydrants with no water, and the water itself can evaporate before reaching the fire front; embers often ignite the roof anyway, and wet gutters can accumulate flammable debris.",
  "root_cause_type": "generic",
  "root_cause_zh": "野火期间屋顶洒水器可能降低市政水系统压力，导致消防栓无水，且水在到达火锋前可能蒸发；余烬仍可能点燃屋顶，湿排水沟会积聚易燃碎片。",
  "versions": [
    {
      "version": "NFPA 1144 Wildfire Risk Reduction",
      "introduced": null,
      "deprecated": null,
      "removed": null,
      "behavior_change": null,
      "status": "active"
    },
    {
      "version": "CAL FIRE Defensible Space Guide v2023",
      "introduced": null,
      "deprecated": null,
      "removed": null,
      "behavior_change": null,
      "status": "active"
    }
  ],
  "os_specific": {},
  "dead_ends": [
    {
      "action": "",
      "why_fails": "Water pressure drops drastically when many homes run sprinklers, rendering fire hoses useless.",
      "fail_rate": 0.9,
      "condition": "",
      "sources": []
    },
    {
      "action": "",
      "why_fails": "Wind-driven embers can land on dry parts of the roof not covered by sprinkler spray, igniting the structure.",
      "fail_rate": 0.85,
      "condition": "",
      "sources": []
    },
    {
      "action": "",
      "why_fails": "Water on the roof can freeze in cold climates or cause roof collapse if the structure is already weakened by fire.",
      "fail_rate": 0.7,
      "condition": "",
      "sources": []
    }
  ],
  "workarounds": [
    {
      "action": "Install a Class A fire-rated roof (e.g., metal, tile, or asphalt with fire-resistant underlayment) and clean gutters of debris before fire season.",
      "success_rate": 0.9,
      "how": "Install a Class A fire-rated roof (e.g., metal, tile, or asphalt with fire-resistant underlayment) and clean gutters of debris before fire season.",
      "condition": "",
      "sources": []
    },
    {
      "action": "Use a dedicated cistern or pool with a gas-powered pump for exterior sprinklers, not the municipal water supply.",
      "success_rate": 0.85,
      "how": "Use a dedicated cistern or pool with a gas-powered pump for exterior sprinklers, not the municipal water supply.",
      "condition": "",
      "sources": []
    },
    {
      "action": "Create defensible space by clearing vegetation within 30 feet of the house and using non-combustible landscaping (gravel, stone).",
      "success_rate": 0.92,
      "how": "Create defensible space by clearing vegetation within 30 feet of the house and using non-combustible landscaping (gravel, stone).",
      "condition": "",
      "sources": []
    }
  ],
  "workarounds_zh": [
    "Install a Class A fire-rated roof (e.g., metal, tile, or asphalt with fire-resistant underlayment) and clean gutters of debris before fire season.",
    "Use a dedicated cistern or pool with a gas-powered pump for exterior sprinklers, not the municipal water supply.",
    "Create defensible space by clearing vegetation within 30 feet of the house and using non-combustible landscaping (gravel, stone)."
  ],
  "transition_graph": {
    "leads_to": [],
    "preceded_by": [],
    "frequently_confused_with": []
  },
  "official_doc_url": "https://www.nfpa.org/education-and-research/wildfire",
  "official_doc_section": null,
  "error_code": null,
  "verification_tier": "ai_generated",
  "confidence": 0.86,
  "fix_success_rate": 0.78,
  "resolvable": "partial",
  "first_seen": "2024-07-22",
  "last_confirmed": "2024-06-01",
  "last_updated": "2024-06-01",
  "evidence_count": 1,
  "tags": [],
  "locale": "en",
  "aliases": []
}