{"id":"roof-tpo-pvc","version":"0.2.0","classification":{"uniformat":"B3010"},"names":["Roof, TPO or PVC single-ply"],"aliases":["TPO","PVC roof","single ply"],"service_life":{"median_years":15,"range_years":[15,15],"range_basis":"source_spread"},"pm_tasks":[{"task":"Keep TPO roof surface clean for reflectivity","frequency":"P6M","reference":"Public Buildings Service Preventive Maintenance Guide (Public Buildings Maintenance Standards)","url":"https://web.archive.org/web/20231003141600/https://origin-www.gsa.gov/system/files/GSA%20PBS%20Preventive%20Maintenance%20Guide%202022-01302023_0.pdf","page":45,"checklist":"ARCS-RFS-01-06M Roof Inspection - Built Up Type"},{"task":"Check gutters, roof drains and downspouts are attached, sealed and clear","frequency":"P1Y","reference":"Public Buildings Service Preventive Maintenance Guide (Public Buildings Maintenance Standards)","url":"https://web.archive.org/web/20231003141600/https://origin-www.gsa.gov/system/files/GSA%20PBS%20Preventive%20Maintenance%20Guide%202022-01302023_0.pdf","page":547,"checklist":"PLMB-DRN-01-01Y Roof Drains, Downspout, and Gutter Inspection"},{"task":"Check drain grates, strainers and screens; replace missing ones","frequency":"P1Y","reference":"Public Buildings Service Preventive Maintenance Guide (Public Buildings Maintenance Standards)","url":"https://web.archive.org/web/20231003141600/https://origin-www.gsa.gov/system/files/GSA%20PBS%20Preventive%20Maintenance%20Guide%202022-01302023_0.pdf","page":547,"checklist":"PLMB-DRN-01-01Y Roof Drains, Downspout, and Gutter Inspection"},{"task":"Test downspout heaters, if fitted","frequency":"P1Y","reference":"Public Buildings Service Preventive Maintenance Guide (Public Buildings Maintenance Standards)","url":"https://web.archive.org/web/20231003141600/https://origin-www.gsa.gov/system/files/GSA%20PBS%20Preventive%20Maintenance%20Guide%202022-01302023_0.pdf","page":547,"checklist":"PLMB-DRN-01-01Y Roof Drains, Downspout, and Gutter Inspection"},{"task":"Check for scouring where downspouts discharge onto lower roofs","frequency":"P1Y","reference":"Public Buildings Service Preventive Maintenance Guide (Public Buildings Maintenance Standards)","url":"https://web.archive.org/web/20231003141600/https://origin-www.gsa.gov/system/files/GSA%20PBS%20Preventive%20Maintenance%20Guide%202022-01302023_0.pdf","page":547,"checklist":"PLMB-DRN-01-01Y Roof Drains, Downspout, and Gutter Inspection"}],"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":8,"code":"HUD CNA 3.3.4.2.4","label":"Low slope-Thermoplastic membrane, (TPO, vinyl)","years":15,"note":"Same life for family and elderly properties. US multifamily housing."}],"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.","Written for GSA contracted O&M in US federal buildings; job plans are generic and defer to manufacturer instructions, and the fire extinguisher plans only point to NFPA 10."],"contributors":["unfinished.one editors"],"last_reviewed":"2026-10-22","canonical_url":"https://unfinished.one/c/roof-tpo-pvc","versioned_url":"https://unfinished.one/c/roof-tpo-pvc/v/0.2.0","licence":"CC-BY-4.0","citation":"unfinished.one (2026). Roof, TPO or PVC single-ply, v0.2.0. https://unfinished.one/c/roof-tpo-pvc/v/0.2.0"}