Uniformat B3010

Roof, built-up

Also called BUR, tar and gravel

• Confidence C
• Version 0.1.0
• Reviewed 2026-10-21

Service life

Years in service. The band runs from the shortest to the longest life the sources state, so it shows how much they disagree, not how long 80% of units last. The line is the median of the stated lives.

Basis

• 20 years · CNA e-Tool Estimated Useful Life Table, p8 · HUD CNA 3.3.4.2.1 “Low slope-Built-up Roof, with gravel finish” — U.S. Department of Housing and Urban Development (planning life)
  Same life for family and elderly properties. US multifamily housing. HUD gives 20 years with a gravel finish and 10 without.
• 10 years · CNA e-Tool Estimated Useful Life Table, p8 · HUD CNA 3.3.4.2.2 “Low slope-Built-up Roof, no mineral or gravel finish” — U.S. Department of Housing and Urban Development (planning life)
  Same life for family and elderly properties. US multifamily housing.
• 15 years · Trent Lakes: 5.17 Capital Asset Policy, p10 · “Roofing - Tar & Gravel” (accounting life)
  Capital asset policy (amortization period). Approved on text check: the label and value were found on the cited page.

How sources are chosen and recorded: sourcing policy.

Preventive maintenance

No maintenance tasks are sourced for this component yet.

Open questions

• HUD gives planning lives for US multifamily housing; the municipal rows are Ontario accounting lives. Neither is observed replacement data.
• No preventive maintenance tasks are sourced yet.

Know the answer? Send it with a source to [email protected].

Cite this

Citation

unfinished.one (2026). Roof, built-up, v0.1.0. https://unfinished.one/c/roof-built-up/v/0.1.0

BibTeX

@misc{unfinished_roof_built_up_0_1_0,
  title = {Roof, built-up},
  author = {{unfinished.one}},
  year = {2026},
  version = {0.1.0},
  url = {https://unfinished.one/c/roof-built-up/v/0.1.0},
  note = {CC BY 4.0}
}

Licence CC BY 4.0 · How to cite · JSON · Versions: 0.1.0