OSHA Silica Table 1 for Construction: Controls, Respirator Rules and the 4-Hour Trap (2026)

TL;DR: OSHA silica Table 1 is the list of construction tasks in 29 CFR 1926.1153(c) where an employer can skip exposure monitoring if it fully and properly implements the listed engineering controls, work practices and respirators. If a task is not on Table 1, or the controls are not fully in place, the employer must assess exposure and keep it at or below the 50 µg/m³ 8-hour PEL under 1926.1153(d). Either way, the standard also requires a written exposure control plan, a competent person, housekeeping limits, and medical exams for workers who must wear a respirator 30 or more days a year.

On semiconductor and battery plant projects, concrete never stops: core drilling for utilities, saw cutting for trenches, grinding for anchors and coatings. That is why OSHA silica Table 1 comes up in almost every safety coordinator interview I set up. Hiring managers want to know whether you can look at a task, find the right Table 1 row, and tell a foreman exactly what has to change before work starts.

This guide covers how Table 1 works, the rows you will use most, the shift-duration trap that catches people, and what the rest of the construction silica standard requires. All requirements come from 29 CFR 1926.1153 as published in the eCFR.

Who the construction silica standard covers

1926.1153 applies to all occupational exposures to respirable crystalline silica in construction work. The only exception is where employee exposure will remain below the 25 µg/m³ action level as an 8-hour time-weighted average under any foreseeable conditions. Cutting, drilling, grinding, crushing or abrading concrete, block, brick, stone, mortar or tile is where exposure usually comes from.

Two numbers anchor the standard:

How OSHA silica Table 1 works

Under 1926.1153(c)(1), for each employee doing a task listed in Table 1, the employer must fully and properly implement the engineering controls, work practices and respiratory protection specified for that task. An employer that does this is not required to assess exposure for that task. That is the whole value of Table 1: follow the row exactly, and you skip air monitoring.

“Fully and properly” is doing a lot of work in that sentence. If the saw’s water feed is clogged, the shroud is missing, or the vacuum is not the one the row specifies, you are no longer on Table 1. At that point the employer is under 1926.1153(d) and has to assess exposure.

Table 1 also has general requirements in (c)(2): for tasks indoors or in enclosed areas, provide exhaust as needed to minimize visible airborne dust; for wet methods, apply water at flow rates sufficient to minimize release of visible dust; and for enclosed cabs or booths, maintain them with positive pressure, filtered intake air, and heating and cooling.

Table 1 rows you will use most on plant projects

The table below summarizes common rows from 1926.1153(c). The right-hand columns show the required respiratory protection and minimum assigned protection factor (APF). “None” means the engineering control alone is enough when fully implemented.

Each row in the regulation has more detail than this summary, such as specific vacuum and filter requirements for dust collection systems. Read the actual row before you approve a method.

We use water. Doesn’t that cover it?

Water feels like the safe answer, and for many Table 1 rows it is part of the answer. Candidates often tell me their crew wets the saw and assumes the silica rule is covered for the whole shift.

Table 1 under 29 CFR 1926.1153(c) lists controls task by task, with separate columns for 4 hours or less and more than 4 hours per shift, and if you do several Table 1 tasks in one shift the time adds up across all of them. So water on the saw doesn’t settle the grinder. Ask which Table 1 row covers each tool you actually run.

The 4-hour rule that catches people

The respirator columns split at 4 hours per shift, and 1926.1153(c)(3) explains how to count. If an employee does more than one Table 1 task in a shift and the total time on those tasks is more than 4 hours, the employee must use the “more than 4 hours” protection for every task. If the total is 4 hours or less, the “4 hours or less” column applies to each task.

Example: an apprentice runs a handheld saw outdoors for 3 hours, then grinds outdoors for 2 hours. Total Table 1 time is 5 hours, so the handheld saw row now requires APF 10, even though the saw itself ran only 3 hours. This is the most common Table 1 mistake I hear from candidates, and a good interview answer mentions it without being asked.

When Table 1 does not apply: alternative exposure control methods

If the task is not on Table 1, or the controls cannot be fully implemented, 1926.1153(d) applies. The employer must keep exposure at or below the PEL and assess exposure in one of two ways:

• Performance option: assess each employee’s 8-hour TWA exposure using any combination of air monitoring data or objective data sufficient to characterize exposure.
• Scheduled monitoring option: perform initial personal breathing zone monitoring, then repeat based on results.

Employees must be notified of assessment results in writing within 5 working days. Engineering and work practice controls come first; respirators supplement them where controls are not enough.

The rest of the standard: plan, competent person, housekeeping, medical

Table 1 only answers the exposure question. Every covered employer still has these duties under 1926.1153:

• Written exposure control plan (g): describes tasks involving exposure, the controls and respirators used for each, housekeeping measures, and procedures to restrict access to work areas where needed. It must be reviewed at least annually and made available to covered employees on request.
• Competent person (g): designated to make frequent and regular inspections of job sites, materials and equipment to implement the plan.
• Respiratory protection (e): where respirators are required, a program under 29 CFR 1910.134.
• Housekeeping (f): no dry sweeping or dry brushing where it could contribute to exposure, unless wet sweeping, HEPA-filtered vacuuming or other methods that minimize exposure are not feasible. No compressed air for cleaning clothing or surfaces where it could contribute to exposure, unless used with a ventilation system that captures the dust cloud or no alternative is feasible.
• Medical surveillance (h): for employees required to use a respirator under this section for 30 or more days per year, at no cost. Initial exam within 30 days of assignment (unless a qualifying exam was done in the last three years), including a chest X-ray read by a NIOSH-certified B Reader, spirometry and a latent TB test. Periodic exams at least every three years.
• Communication and training (i): silica included in the hazard communication program, and training on health hazards, tasks, controls, the competent person and medical surveillance.
• Recordkeeping (j): air monitoring, objective data and medical surveillance records kept under 29 CFR 1910.1020.

Nobody ever told me what silicosis was

I hear this from workers more often than I’d like: they ran saws and grinders for years, and nobody ever sat them down to explain what silica dust does or what silicosis is. The rule puts that explanation on the employer.

Under 1926.1153(i)(2)(i), workers covered by the standard must be able to show they understand the health hazards, which tasks expose them, the controls, who the competent person is, and the purpose of medical surveillance. Under (h)(1), if you must wear a respirator 30 or more days a year, your employer offers medical exams at no cost, starting within 30 days of assignment and at least every three years. Worth asking:

• Will this job put me in a respirator 30 or more days a year?
• Who is the competent person for silica on this site?
• When is my first medical exam?

How to show silica experience on a resume

Safety coordinator and EHS manager roles on plant projects often list “silica program” in the job description. Strong resume lines are specific:

• “Wrote and annually reviewed the silica exposure control plan for a multi-trade concrete scope.”
• “Served as silica competent person; audited Table 1 controls on core drilling, saw cutting and grinding.”
• “Coordinated scheduled monitoring for non-Table 1 tasks and tracked 30-day respirator use for medical surveillance.”

If you are building toward these roles, our guide on OSHA 10 vs OSHA 30 explains the training baseline, and our construction safety manager career guide covers the path from coordinator to manager.

FAQ

What is OSHA silica Table 1?

It is the list in 29 CFR 1926.1153(c) of common construction tasks with specified engineering controls, work practices and respiratory protection. If an employer fully and properly implements the row for a task, it does not have to assess exposure for that task.

Do I need air monitoring if I follow Table 1?

No, not for that task, as long as every control in the row is fully and properly implemented. If controls are missing or the task is not listed, the employer must assess exposure under 1926.1153(d).

What is the silica PEL in construction?

50 micrograms per cubic meter of air as an 8-hour time-weighted average, with an action level of 25 µg/m³.

When is a silica medical exam required?

When an employee is required by the standard to wear a respirator for 30 or more days per year. The initial exam is due within 30 days of assignment, and periodic exams at least every three years.

Can I use compressed air to clean silica dust?

Only with a ventilation system that effectively captures the dust cloud, or when no alternative method is feasible, under 1926.1153(f)(2).

Official sources

• 29 CFR 1926.1153, Respirable crystalline silica (eCFR)
• OSHA’s Respirable Crystalline Silica Standard for Construction (OSHA 3681)
• Control of Silica Dust in Construction: Walk-Behind Saws (OSHA fact sheet)
• Control of Silica Dust in Construction: Handheld Grinders for Mortar Removal (OSHA fact sheet)

ABOUT THE AUTHOR

Jacob Kim

Bilingual (English/Korean) recruiter based in New Jersey. I place engineers, technicians and office staff with Korean-affiliated companies and their suppliers across the U.S., and I write GRYNDHAUS from the questions candidates actually ask me during interviews, offers and their first months on the job.

OSHA 30 · B.B.A., Baruch College (CUNY)

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