OSHA 29 CFR 1926.1101: Asbestos in Construction.

Official rule: 29 CFR 1926.1101 on osha.gov. Read the actual text when you need to make a compliance decision.

What it covers

Construction work, alteration, repair, maintenance, or renovation of structures, substrates, or portions thereof, that contain asbestos. Defined broadly: includes demolition or salvage, removal or encapsulation of materials containing asbestos, construction or installation of products containing asbestos, asbestos spill cleanup, and maintenance of asbestos-containing products on facilities or equipment.

The four work classes

The rule classifies work into four categories, each with different requirements.

• Class I: removal of thermal system insulation or surfacing material. The most stringent.
• Class II: removal of other asbestos-containing materials (wallboard, floor tile, roofing, siding, transite).
• Class III: repair and maintenance operations likely to disturb ACM.
• Class IV: custodial activities involving ACM-contaminated waste or debris.

Permissible exposure limit

• PEL: 0.1 fiber per cubic centimeter of air (f/cc) as an 8-hour TWA.
• Excursion limit: 1.0 f/cc averaged over any 30-minute period.
• Action level: 0.1 f/cc TWA (same as the PEL; triggers monitoring, training, and surveillance programs).

Exposure monitoring

Initial exposure assessment is required for each operation. Periodic monitoring is required for Class I and II work; daily monitoring of each shift, each worker. Class III work requires monitoring sufficient to demonstrate exposures stay below the PEL and the excursion limit. Class IV requires monitoring sufficient to demonstrate exposures from custodial work stay below the action level.

Regulated area and work practice controls

For Class I and II work, the rule requires a regulated area, posted with warning signs, accessible only to authorized personnel. Required engineering controls and work practices vary by class:

• Wet methods (wetting ACM to suppress fiber release).
• Negative pressure enclosures for Class I work of significant scope.
• Glove bags for small Class I work on pipes.
• Local exhaust ventilation with HEPA filtration.
• Prohibition on certain practices (high-speed abrasive disc saws not equipped with point-of-cut ventilation, dry sweeping, compressed air for cleaning).

Respiratory protection

Required where engineering controls and work practices cannot reduce exposure to or below the PEL. Specific respirator types are required by work class and conditions. Fit testing under 29 CFR 1910.134 is required before initial use, when changing models, and annually.

Worker accreditation and training

• Class I and II workers: AHERA-accredited initial training (40-hour worker, 5-day) plus annual 8-hour refresher.
• Class I and II supervisors: AHERA-accredited supervisor training (40-hour, 5-day) plus annual 8-hour refresher.
• Class III workers: at least 16 hours of training covering Class III procedures.
• Class IV workers: at least 16 hours of training covering Class IV procedures (commonly called "Awareness" training plus janitorial).

Medical surveillance

Required for any worker exposed at or above the action level or excursion limit for 30 or more days per year, or who is required to wear a negative-pressure respirator. Includes pre-placement medical exam, periodic exams (annual), chest X-rays per the physician's schedule, and a respirator clearance.

Recordkeeping and retention

• Exposure monitoring records: at least 30 years (under 29 CFR 1910.1020).
• Medical surveillance records: duration of employment plus 30 years.
• Training records: one year beyond the last date of employment.

What we do

Nexus tracks the credentials, exposure records, daily forms, and project documentation that this rule requires. See our asbestos abatement page for how the workflows map to the rule.

Related

• EPA NESHAP — 40 CFR 61, Subpart M
• Asbestos regulations by state (licensing and notification for all 50 states + DC)
• Worker credential tracking in Nexus
• 30-year record retention

Last reviewed against the published rule: 2026-05-27. This is a summary, not legal advice. Consult the actual rule text and a qualified professional when making compliance decisions.