The OSHA silica rule in construction: Table 1, the control plan and what inspectors check

Which tasks create silica exposure

• Cutting concrete, block, brick, stone or tile with saws.
• Drilling and coring concrete and masonry.
• Grinding concrete floors, including surface preparation for coatings.
• Tuckpointing and removing mortar.
• Jackhammering and chipping.
• Fabricating and installing stone and engineered stone countertops.
• Milling, crushing and demolition of concrete.
• Dry sweeping or blowing dust with compressed air.

If your crews do any of these regularly, the standard applies to you, whether you are a large general contractor or a two-person tile crew.

Two ways to comply: Table 1 or exposure assessment

The standard gives employers a choice. The first path is Table 1: for each common task and tool listed, it specifies the engineering controls, work practices and, when needed, the respirator that must be used. If you fully and properly implement the Table 1 controls for a task, you do not need to measure workers' exposure for that task. The second path is to assess exposure, through air monitoring or objective data, and keep it below the limit with whatever controls work. Most small contractors choose Table 1 because it is clear and avoids the cost of air sampling.

How Table 1 works in practice

Table 1 is organized by equipment and task: handheld power saws, walk-behind saws, drills, jackhammers, grinders, floor grinders and others. For each, it typically requires one of two control methods: water delivered to the blade or bit to suppress dust, or a local exhaust ventilation system (a shroud connected to a vacuum with a filter of the required efficiency). It also sets respirator requirements that often depend on whether the task is done indoors or outdoors and whether it lasts more or less than four hours in a shift. The details matter: the right flow of water, the shroud recommended by the tool manufacturer, the vacuum with enough airflow and the right filter. A saw with a water hose that is not turned on does not count.

The written exposure control plan

Every employer covered by the standard needs a written plan. It does not have to be long, but it must describe:

• The tasks that involve silica exposure.
• The engineering controls, work practices and respiratory protection used for each task.
• The housekeeping measures used to limit exposure.
• How access to high-exposure work areas will be limited, where relevant.

Make the plan practical: one line per task, with the tool, the control and the respirator. Review it at least once a year and whenever you add a new tool or task.

The competent person

The plan must be implemented by a competent person: someone who can identify silica hazards on the site and has the authority to correct them. In a small company this is usually the foreman or the owner. The competent person checks that tools have the right controls, that water is flowing and vacuums are working, that workers wear the required respirators and that housekeeping follows the plan. Frequent and regular inspections of the jobsite, materials and equipment are part of the job.

Housekeeping: no dry sweeping, no compressed air

Dry sweeping and dry brushing that contribute to exposure are not allowed where wet sweeping, HEPA vacuuming or other methods that minimize exposure are feasible. Compressed air to clean clothing or surfaces is also restricted when it contributes to exposure, with limited exceptions. On a real site, this means HEPA vacuums for cleanup after cutting and grinding, wetting down dust before sweeping and never blowing off clothes with an air hose.

Respirators and the respiratory protection program

When Table 1 requires a respirator, or when controls alone cannot keep exposure below the limit, you must provide respirators and follow OSHA's respiratory protection standard: medical clearance to wear a respirator, fit testing for tight-fitting respirators, training and a written respiratory protection program. A dust mask bought at the hardware store and worn loose does not meet the requirement. Respirators are the last line of defense; the water and the vacuum do most of the work.

Medical surveillance

Workers who are required by the standard to wear a respirator for 30 or more days a year must be offered medical exams at no cost, including a chest X-ray and lung function test, with a baseline exam and follow-up exams at least every three years. This is often the part small contractors overlook. Track respirator days per worker so you know who crosses the threshold.

Training

Workers must understand the health hazards of silica, the tasks that create exposure, the controls the company uses, the purpose of medical surveillance and who the competent person is. Short, hands-on sessions at the saw or the grinder work better than a video. Train in the language your crew understands best and document who was trained and when.

A one-page control plan you can adapt

• Company, sites covered and competent person, with phone number.
• Task: cutting concrete block outdoors with a handheld saw. Control: integrated water delivery, flow checked at start of shift. Respirator: per Table 1 for task duration.
• Task: drilling anchors indoors. Control: shroud with dust extraction vacuum and required filter. Respirator: per Table 1.
• Task: floor grinding for coatings. Control: grinder with local exhaust and required vacuum. Respirator: per Table 1.
• Housekeeping: HEPA vacuum or wet methods; no dry sweeping, no compressed air on clothing.
• Restricted areas: how other trades are kept out of high-dust work zones.
• Review date and signature.

Buy tools with the controls built in

The cheapest moment to comply is when you buy equipment. Many saws, drills and grinders are sold with integrated water delivery or dust shrouds designed for them, and several manufacturers sell vacuums matched to their tools. When replacing a tool, choose the version that meets Table 1 out of the box, and standardize across crews so the plan stays simple.

A worked example: a concrete cutting crew

A small contractor cuts and cores concrete for plumbing and electrical trades, with two crews of two. To follow Table 1, the owner equips each handheld saw with an integrated water delivery system, each core drill with water feed, and buys a dust-extraction vacuum with the required filter for grinding and indoor drilling. Add respirators and fit testing for workers doing the indoor tasks that Table 1 requires them for, a written control plan and training. The upfront cost for equipment and setup can run into several thousand dollars. In return, the company can show the plan on day one when a general contractor asks for its silica program, avoids the cost of air sampling for Table 1 tasks and reduces the risk of a citation and of a disease that appears years later. The numbers vary by trade and tools, but for most contractors compliance costs less than one serious citation.

Engineered stone: a growing concern

Fabricating and installing engineered stone countertops, which can contain very high levels of crystalline silica, has been linked to cases of severe silicosis in relatively young workers. Regulators have increased attention on this sector. If your company cuts, polishes or modifies engineered stone on site or in a shop, treat it as a high-exposure task: wet methods, local exhaust, respirators and strict housekeeping.

What general contractors and owners will ask for

More and more general contractors and owners ask subcontractors for their silica exposure control plan during prequalification, along with training records and proof of respirator fit testing. Having these ready is a competitive advantage: it shortens onboarding and shows that your company is organized. See subcontractor prequalification and safety program and insurance rating.

When an inspector shows up

An inspector will usually look at the task in progress, the control in use, the respirators, the housekeeping and then ask for the written plan, training records and fit test records. Have them in the truck or on a phone, not only at the office. Crews who can explain which control they use and why make the visit much shorter.

After the visit, whatever the outcome, review the plan with the crew. If a gap was found, fix it on every site, not only on the one that was inspected, and record the change with the date.

Common mistakes

• Cutting dry "just for one cut".
• Using a shroud without a vacuum, or a shop vac without the required filter.
• Water systems that are installed but not turned on or not flowing enough.
• Dry sweeping and blowing off dust with compressed air.
• Loose dust masks instead of fit-tested respirators when respirators are required.
• No written plan, or a generic plan that does not match the tasks.
• Not tracking respirator days for medical surveillance.

Checklist for your company

• List every task that creates silica dust.
• Match each task to its Table 1 controls, or plan exposure assessment.
• Equip tools with water delivery or local exhaust as required.
• Write the exposure control plan and name the competent person.
• Set up the respiratory protection program where respirators are required.
• Track respirator days and offer medical exams when required.
• Train every exposed worker and keep records.
• Replace dry sweeping and compressed air with HEPA vacuums and wet methods.

Silica exposure is invisible on the day it happens and devastating years later. The controls are well known and affordable, and they protect both the crew and the company's ability to win work. For other jobsite health rules, see heat illness prevention on the jobsite.

Frequently asked questions

What is the OSHA permissible exposure limit for silica in construction?

The construction standard sets a permissible exposure limit of 50 micrograms of respirable crystalline silica per cubic meter of air, averaged over an 8-hour day, with an action level of 25.

Do I need to test air for silica if I follow Table 1?

No. If you fully and properly implement the engineering controls, work practices and respiratory protection specified in Table 1 for a task, you do not need to assess exposure for that task. You still need a written exposure control plan, a competent person, training and records.