{
  "page": "/us/lifespan/retaining-wall",
  "built_from": "data/lifespan/facts/retaining-wall.json",
  "rows": [
    {
      "type": "Typical timber wall design life; not an observed average or a replacement deadline",
      "measure": "Typical timber wall design life; not an observed average or a replacement deadline",
      "value": 15,
      "unit": "years; less than",
      "source": "North Carolina Geological Survey, Geologic Hazards and Landslides",
      "url": "https://www.deq.nc.gov/about/divisions/energy-mineral-and-land-resources/nc-geological-survey/geologic-hazards-and-landslides",
      "data_years": "undated guidance; no lifetime data years published",
      "read": "2026-11-02",
      "area": "North Carolina homeowner slope-stabilization guidance",
      "n": "not published by the source",
      "se_points": null,
      "fact_id": "retaining-wall-timber-design-life"
    },
    {
      "type": "Limitations of landscaping timber walls for home slope stabilization",
      "measure": "Limitations of landscaping timber walls for home slope stabilization",
      "value": null,
      "unit": "",
      "source": "North Carolina Geological Survey, Geologic Hazards and Landslides",
      "url": "https://www.deq.nc.gov/about/divisions/energy-mineral-and-land-resources/nc-geological-survey/geologic-hazards-and-landslides",
      "data_years": "undated guidance; no lifetime data years published",
      "read": "2026-11-02",
      "area": "North Carolina homeowner slope-stabilization guidance",
      "n": "not published by the source",
      "se_points": null,
      "fact_id": "retaining-wall-timber-home-limitation"
    },
    {
      "type": "Surface and subsurface water in home slope stabilization",
      "measure": "Surface and subsurface water in home slope stabilization",
      "value": null,
      "unit": "",
      "source": "North Carolina Geological Survey, Geologic Hazards and Landslides",
      "url": "https://www.deq.nc.gov/about/divisions/energy-mineral-and-land-resources/nc-geological-survey/geologic-hazards-and-landslides",
      "data_years": "undated guidance; no lifetime data years published",
      "read": "2026-11-02",
      "area": "North Carolina homeowner slope-stabilization guidance",
      "n": "not published by the source",
      "se_points": null,
      "fact_id": "retaining-wall-slope-drainage"
    },
    {
      "type": "Engineered slope-stabilization wall examples; no lifespan for these materials",
      "measure": "Engineered slope-stabilization wall examples; no lifespan for these materials",
      "value": null,
      "unit": "",
      "source": "North Carolina Geological Survey, Geologic Hazards and Landslides",
      "url": "https://www.deq.nc.gov/about/divisions/energy-mineral-and-land-resources/nc-geological-survey/geologic-hazards-and-landslides",
      "data_years": "undated guidance; no lifetime data years published",
      "read": "2026-11-02",
      "area": "North Carolina homeowner slope-stabilization guidance",
      "n": "not published by the source",
      "se_points": null,
      "fact_id": "retaining-wall-engineered-wall-types"
    },
    {
      "type": "County observation interval",
      "measure": "County observation interval",
      "value": 1,
      "unit": "year; at least once",
      "source": "Snohomish County, Retaining Walls & Terracing",
      "url": "https://snohomishcountywa.gov/6968/Retaining-Walls-Terracing",
      "data_years": "undated guidance; no lifetime data years published",
      "read": "2026-11-02",
      "area": "Snohomish County, Washington homeowner guidance",
      "n": "not published by the source",
      "se_points": null,
      "fact_id": "retaining-wall-annual-observation"
    },
    {
      "type": "County warning signs and attributed referral advice",
      "measure": "County warning signs and attributed referral advice",
      "value": null,
      "unit": "",
      "source": "Snohomish County, Retaining Walls & Terracing",
      "url": "https://snohomishcountywa.gov/6968/Retaining-Walls-Terracing",
      "data_years": "undated guidance; no lifetime data years published",
      "read": "2026-11-02",
      "area": "Snohomish County, Washington homeowner guidance",
      "n": "not published by the source",
      "se_points": null,
      "fact_id": "retaining-wall-buckling-and-ground-cracks"
    },
    {
      "type": "Drainage and wall-failure mechanism",
      "measure": "Drainage and wall-failure mechanism",
      "value": null,
      "unit": "",
      "source": "Snohomish County, Retaining Walls & Terracing",
      "url": "https://snohomishcountywa.gov/6968/Retaining-Walls-Terracing",
      "data_years": "undated guidance; no lifetime data years published",
      "read": "2026-11-02",
      "area": "Snohomish County, Washington homeowner guidance",
      "n": "not published by the source",
      "se_points": null,
      "fact_id": "retaining-wall-water-build-up"
    },
    {
      "type": "County timber wall durability statement",
      "measure": "County timber wall durability statement",
      "value": null,
      "unit": "",
      "source": "Snohomish County, Retaining Walls & Terracing",
      "url": "https://snohomishcountywa.gov/6968/Retaining-Walls-Terracing",
      "data_years": "undated guidance; no lifetime data years published",
      "read": "2026-11-02",
      "area": "Snohomish County, Washington homeowner guidance",
      "n": "not published by the source",
      "se_points": null,
      "fact_id": "retaining-wall-wood-soil-decay"
    },
    {
      "type": "County site-specific drainage design guidance",
      "measure": "County site-specific drainage design guidance",
      "value": null,
      "unit": "",
      "source": "Snohomish County, Retaining Walls & Terracing",
      "url": "https://snohomishcountywa.gov/6968/Retaining-Walls-Terracing",
      "data_years": "undated guidance; no lifetime data years published",
      "read": "2026-11-02",
      "area": "Snohomish County, Washington homeowner guidance",
      "n": "not published by the source",
      "se_points": null,
      "fact_id": "retaining-wall-drainage-site-design"
    }
  ]
}