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STEELTOETOOLS
Toolbox talk · 10 min · HazCom & Chemicals

Asbestos Awareness

Hazards: Asbestosis and lung scarring from inhaled fibers · Lung cancer, with the risk multiplied by smoking · Mesothelioma, with a latency of decades · Take-home exposure on clothing

Why it matters

There is no accident report for this one. Nobody gets carried off the site — the bill arrives twenty to seventy-one years later, the latency range CDC reported for mesothelioma in MMWR 2017;66(8). That report counted 45,221 mesothelioma deaths between 1999 and 2015, 2,597 in 2015 alone. Those exposures happened on jobs that looked like today's.

Key points

  • Pre-1981 means presumed, not maybe. Thermal system insulation and sprayed or troweled surfacing in a building built no later than 1980 is presumed asbestos containing material, and so is asphalt and vinyl flooring from that era. It stays presumed until someone documents otherwise.
  • Know which class you are in. Class I is insulation and surfacing removal. Class II is everything else being removed. Class III is repair and maintenance that will disturb it. Class IV is contact without disturbance, plus cleanup. The class sets your training, your controls and your supervision.
  • Four practices are banned outright. No high-speed abrasive disc saw without point-of-cut ventilation or a HEPA-filtered enclosure. No compressed air unless an enclosed system captures the cloud. No dry sweeping or shoveling. No rotating people to spread the dose around.
  • 0.1 fiber per cc over 8 hours, 1.0 over 30 minutes. Those are the two limits. A half-hour of grinding old mastic can blow the excursion limit without touching the daily average.
  • If you find it, stop and back out. Put the tool down, leave the material alone, get the competent person. Opening it up to see what it is defeats the whole standard.
  • Smoking multiplies it. The standard makes the smoking-plus-asbestos lung cancer link a required training subject. That is not a lecture about your habits; it is arithmetic about your risk.

Do / Don't

Do

  • Ask for the building's asbestos survey before you open anything.
  • Treat gray pipe wrap, sprayed ceiling texture and 9-inch floor tile as suspect.
  • Keep material wet and bag debris in leak-tight containers as you go.
  • Change out of work clothes on site so nothing rides home in the truck.

Don't

  • Dry sweep or shovel debris that might contain asbestos.
  • Blow dust off with the air hose, or off your clothes.
  • Cut it with a grinder or a high-speed disc saw without HEPA capture.
  • Assume “it is only a small piece” puts you outside the standard.

Quick site check

  • What year was this building built, and does anyone have the survey in hand?
  • What class of work are we doing today, and who is trained for it?
  • Is there a HEPA vacuum, water and leak-tight bags on this floor right now?
  • Where do we change and wash before we get in our own vehicles?
Discussion — ask the crew
  1. How old is this building, and who has seen the asbestos survey for it?
  2. Where in here is there pipe wrap, sprayed ceiling texture or 9-inch floor tile nobody has tested?
  3. You open a wall and find gray pipe wrap. What do you do in the next sixty seconds?
  4. Who here can stop the job over suspect material, and does everybody know their name?
Refs: 29 CFR 1926.1101 - Asbestos in construction: permissible exposure limits (c), multi-employer worksites (d), methods of compliance and prohibitions (g), communication of hazards (k) · 29 CFR 1910.1001 - Asbestos in general industry: the same 0.1 f/cc TWA and 1.0 f/cc excursion limit · CDC / MMWR 2017;66(8) - Malignant Mesothelioma Mortality, United States, 1999-2015: 45,221 deaths, 2,597 of them in 2015; latency 20 to 71 years · CDC / MMWR 2022;71(19) - Malignant Mesothelioma Mortality in Women, 1999-2020: 489 deaths in 1999, 614 in 2020 · EPA - Asbestos Model Accreditation Plan, 40 CFR part 763 subpart E: the training 1926.1101(k)(9) points toSign-in sheet included in the printed version

Frequently asked questions

Thermal system insulation and sprayed or troweled-on surfacing material in buildings constructed no later than 1980 must be identified as asbestos-containing unless the employer or building owner determines otherwise under 1926.1101(k)(5). Asphalt and vinyl flooring installed no later than 1980 must also be treated as asbestos-containing unless a determination is made under (g)(8)(i)(I). The standard calls this presumed asbestos containing material, or PACM, and it must be identified to employees as ACM.

1926.1101(c)(1) sets a time-weighted average limit of 0.1 fiber per cubic centimeter of air over 8 hours. 1926.1101(c)(2) adds an excursion limit of 1.0 fiber per cubic centimeter averaged over any 30-minute sampling period. The general industry standard, 1910.1001, uses the same two numbers.

Class I is the removal of thermal system insulation and surfacing ACM or PACM. Class II is the removal of other asbestos-containing material, such as wallboard, floor tile and sheeting, roofing and siding shingles, and construction mastics. Class III is repair and maintenance work where ACM, including thermal system insulation and surfacing material, is likely to be disturbed. Class IV is maintenance and custodial work where employees contact but do not disturb ACM or PACM, and the cleanup of dust, waste and debris from Class I, II and III work. All four definitions are in 1926.1101(b).

Four things, listed in 1926.1101(g)(3), and they apply regardless of measured levels or the results of an exposure assessment: high-speed abrasive disc saws that are not equipped with a point-of-cut ventilator or an enclosure with HEPA-filtered exhaust; compressed air to remove asbestos or asbestos-containing material, unless used with an enclosed ventilation system designed to capture the dust cloud; dry sweeping, shoveling or other dry cleanup of dust and debris containing ACM or PACM; and rotating employees as a way of reducing exposure.

1926.1101(k)(9)(ii) requires training before or at the time of initial assignment and at least annually after that. The amount depends on the class. Class IV maintenance and custodial work follows the EPA requirements at 40 CFR 763.92(a)(1) and takes at least 2 hours. Class III follows 40 CFR 763.92(a)(2) and takes at least 16 hours with hands-on training. Class II work on roofing, flooring, siding, ceiling tiles or transite panels takes at least 8 hours with hands-on training. Class I work, and Class II work needing critical barriers or negative pressure enclosures, requires a course equivalent in curriculum, training method and length to the EPA Model Accreditation Plan asbestos abatement workers training at 40 CFR part 763, subpart E, appendix C.

1926.1101(d)(1): an employer performing work that requires a regulated area must inform the other employers on site of the nature of the asbestos or PACM work, of the existence of and requirements for regulated areas, and of the measures taken to make sure their employees are not exposed. On a renovation with four trades in the building, that notification is the difference between one crew in respirators and four crews breathing the same air.

Yes, and the standard says so. 1926.1101(k)(9)(viii)(C) requires the training to cover the relationship between smoking and asbestos in producing lung cancer. It is one of the few places OSHA names a personal habit in a construction standard, and it is there because the combined risk is far larger than either alone.

Sources & references

Content checked against these sources — last reviewed August 28, 2026.

Results are estimates for planning purposes and do not replace a competent person's evaluation or an engineer's design. Follow the OSHA standards that apply to your work and your employer's written program.

By — Editorial team of SteelToeTools.com (published by LSEA SAS) Updated