29 CFR 1926.1101: OSHA Asbestos in Construction

Regulatory citation: 29 CFR 1926.1101, Asbestos (Construction)

What Is the OSHA Asbestos Standard for Construction?

Section 1926.1101 covers asbestos exposure in construction work. This includes demolition and salvage, removal and encapsulation, renovation, installation of asbestos products, spill cleanup, and transport or disposal of asbestos on a construction site. It does not apply to asbestos-containing asphalt roof coatings, cements and mastics.

The standard sorts work into four classes. Class I is removal of thermal system insulation (TSI) and surfacing material. Class II is removal of other asbestos-containing material (ACM), such as floor tile, wallboard, roofing and siding. Class III is repair and maintenance likely to disturb ACM. Class IV is maintenance and custodial work that contacts but does not disturb ACM.

Why the Asbestos Standard Matters

Disturbing asbestos releases fibers that can cause asbestosis, lung cancer and mesothelioma, often decades later. Construction and renovation crews often meet asbestos in older buildings without expecting it.

Core Obligations

1. Stay Within the Exposure Limits (1926.1101(c))

No employee may be exposed above 0.1 fiber per cubic centimeter of air (f/cc) as an 8-hour time-weighted average. The excursion limit is 1.0 f/cc averaged over 30 minutes.

2. Identify Asbestos Before Work Starts (1926.1101(k))

Building and facility owners must find out whether ACM or presumed asbestos-containing material (PACM) is present before work begins, and tell contractors and tenants. PACM means TSI and surfacing material in buildings built no later than 1980. These materials must be treated as asbestos unless shown otherwise.

3. Set Up Regulated Areas and Coordinate Employers (1926.1101(d) and (e))

Class I, II and III work, and any work where exposure exceeds a limit, must take place in a demarcated regulated area with restricted access. On multi-employer sites, the asbestos contractor must tell other employers about the work, and the general contractor must ensure the asbestos contractor complies.

4. Assess and Monitor Exposure (1926.1101(f))

A competent person must do an initial exposure assessment before or at the start of each operation. Class I work is presumed to exceed the limits until monitoring or a negative exposure assessment shows otherwise. Class I and II work requires daily monitoring unless a negative exposure assessment covers the job. Employees must be told their monitoring results within 5 working days, individually in writing or by posting.

5. Use Required Work Practices (1926.1101(g))

All operations must use HEPA vacuums, wet methods and prompt cleanup into leak-tight containers. Prohibited practices include high-speed abrasive disc saws without HEPA-filtered ventilation, compressed air without an enclosed capture system, dry sweeping or shoveling of ACM debris, and rotating workers to cut exposure. Class I work needs specific controls such as negative pressure enclosures, glove bags or mini-enclosures, with critical barriers and isolated HVAC systems.

6. Provide Respirators, Clothing and Decontamination (1926.1101(h) to (j))

Respirators are required for all Class I work, for certain Class II and III work, and wherever exposure exceeds a limit. Filtering facepiece respirators may not be used for asbestos. Class I jobs involving more than 25 linear feet or 10 square feet of TSI or surfacing material need a decontamination area with an equipment room, shower and clean room in series.

7. Train by Work Class (1926.1101(k)(9))

Training must be given before or at initial assignment and at least annually. Class I work, and Class II work that needs critical barriers or negative pressure enclosures, requires training equivalent to the EPA Model Accreditation Plan asbestos abatement worker training. Class II work limited to one material type, such as roofing or flooring, needs at least 8 hours with hands-on practice. Class III training must be at least 16 hours. Class IV training must be at least 2 hours.

8. Provide Medical Surveillance and Keep Records (1926.1101(m) and (n))

Medical surveillance covers employees who do Class I, II or III work for a combined 30 or more days a year, or who are exposed at or above a limit. Exams are due before assignment to an area where negative-pressure respirators are worn, within 10 working days after the 30th day of exposure, and at least annually after that. Exposure records must be kept for at least 30 years. Medical records are kept for the duration of employment plus 30 years, and training records for 1 year after employment ends.

Common Compliance Approaches

Get a Survey Before You Bid

Ask the owner for the asbestos survey before pricing demolition or renovation work.

Name the Competent Person on Every Job

The competent person runs the exposure assessment and inspects the work. For Class I jobs, on-site inspections must happen at least once each work shift and whenever an employee asks.

Example: Asbestos Work in Practice

A mechanical contractor is hired to replace boilers in a school built in 1972. The pipe lagging is presumed to be asbestos, so its removal is Class I work. The abatement subcontractor builds a negative pressure enclosure with a three-stage decontamination unit and monitors daily. The general contractor checks the subcontractor's training records and keeps its own crew out of the regulated area. Custodians cleaning nearby rooms get Class IV training.

Related regulations: OSHA asbestos in general industry, EPA asbestos NESHAP, OSHA respiratory protection.

Note: In July 2025 OSHA proposed changes to the respirator provisions of its asbestos standards. Hearings were held in August 2026. No final rule had been issued as of October 2026. State plan states may set stricter rules.

Frequently Asked Questions

What is a negative exposure assessment?

It is a demonstration that employee exposure on a job will stay below the PEL and excursion limit. It can be based on objective data, monitoring of closely similar jobs within the past 12 months, or initial monitoring of the current job. Where one applies, daily monitoring of Class I or II work is not required.

Is removing floor tile Class I or Class II work?

Floor tile is not TSI or surfacing material, so removing it is Class II work. Specific work practices for flooring apply.

Who needs a competent person?

Every construction worksite covered by the standard. The competent person must be able to identify asbestos hazards and has authority to correct them.