{"id":"sidewalk-concrete","version":"0.1.0","classification":{"uniformat":"G2030"},"names":["Sidewalk, concrete"],"aliases":["sidewalk","concrete walk"],"service_life":{"median_years":50,"range_years":[50,50],"range_basis":"source_spread"},"pm_tasks":[],"basis":[{"type":"public_document","life_type":"planning","title":"CNA e-Tool Estimated Useful Life Table","by":"U.S. Department of Housing and Urban Development","url":"https://www.hud.gov/sites/documents/eul_for_cna_e_tool.pdf","page":2,"code":"HUD CNA 3.2.5.2","label":"Concrete","years":50,"note":"Same life for family and elderly properties. US multifamily housing. HUD's row is concrete flatwork: walks, plazas, terraces and patios. HUD's row is for site work at US multifamily properties, not municipal networks."}],"confidence":{"grade":"C","sample_size":null},"open_questions":["Only one source so far: HUD planning lives for US multifamily housing. Canadian and observed sources are needed.","No preventive maintenance tasks are sourced yet."],"contributors":["unfinished.one editors"],"last_reviewed":"2026-10-21","canonical_url":"https://unfinished.one/c/sidewalk-concrete","versioned_url":"https://unfinished.one/c/sidewalk-concrete/v/0.1.0","licence":"CC-BY-4.0","citation":"unfinished.one (2026). Sidewalk, concrete, v0.1.0. https://unfinished.one/c/sidewalk-concrete/v/0.1.0"}