OSHA's Silica Rule and Dry Sweeping on Plant Floors

OSHA's respirable crystalline silica standard does not let employers allow dry sweeping or dry brushing where that sweeping could add to a worker's silica exposure, unless wet sweeping, HEPA-filtered vacuuming or another low-dust method is not feasible. The same rule restricts compressed air for blowing dust off surfaces. If your floors collect concrete, sand, stone, glass or foundry dust, a push broom and a leaf blower are no longer a defensible cleaning plan.

This guide explains what the rule covers, which facilities it reaches, and what a compliant floor cleaning routine tends to look like. It is general information, not legal advice.

Where the rule comes from

OSHA published the silica rule in 2016 as two standards:

• 29 CFR 1910.1053 for general industry and maritime (plants, warehouses, fabrication shops, foundries, glass and ceramics, stone countertop shops, and similar)
• 29 CFR 1926.1153 for construction work

Both set a permissible exposure limit (PEL) of 50 micrograms of respirable crystalline silica per cubic metre of air, averaged over an 8-hour shift, and an action level of 25 micrograms. Enforcement in construction began in September 2017, and the general industry standard took effect in June 2018.

The housekeeping section is the part that matters for floors. In the general industry standard it sits in paragraph (h). It covers two practices directly: dry sweeping or brushing, and compressed air.

What the housekeeping section actually requires

Dry sweeping and dry brushing. These are not banned outright. They are not allowed where they could contribute to employee exposure to respirable silica, unless the low-dust alternatives (wet sweeping, HEPA-filtered vacuuming, or other methods that minimize exposure) are not feasible. "Not feasible" is a high bar. Habit or convenience will not usually meet it.

Compressed air. Using compressed air to clean clothing or surfaces is not allowed where it could contribute to exposure, unless it is used together with a ventilation system that captures the dust cloud, or no other method is feasible. Blowing down a production floor or a dusty rack line with an air hose is exactly what the rule targets.

The rule does not name specific machines. It sets an outcome (do not stir silica into the air people breathe) and leaves the method to the employer, who must be able to explain the choice.

Which facilities should pay attention

The standard applies wherever workers can be exposed to respirable crystalline silica, which comes from quartz and cristobalite in many common materials. Floors in these buildings are the usual suspects:

• Concrete product, precast and block plants
• Foundries and metal casting shops
• Glass, ceramic, brick and tile manufacturing
• Countertop fabrication (engineered stone has a very high silica content)
• Sand, gravel, aggregate and asphalt operations with indoor bays
• Warehouses storing bagged cement, mortar, grout or sand, especially where bags break on the dock
• Buildings where concrete floors are being ground, saw-cut or repaired

A typical distribution center with sealed concrete and cardboard dust may never reach the action level. The rule's general industry scope also has an exception for sites where exposure stays below 25 micrograms under any foreseeable conditions. That exception needs objective data behind it, not a guess, so most sites that handle silica materials end up treating the housekeeping section as their baseline.

How a compliant floor routine usually looks

There is no single approved recipe, but the methods below are the ones that line up with what the standard asks for.

Sweepers with real dust control

A ride-on or walk-behind sweeper is still a sweeper, so the question is how it handles fine dust. Machines with a vacuum system pulling air through a filter, and in some cases a water spray at the brush, keep most of the dust inside the hopper instead of throwing it into the aisle. Filter class matters here. A standard panel filter catches coarse debris, while fine silica calls for a higher-efficiency filter that is inspected and changed on a schedule. Our dust-control floor sweeping service is built around this kind of setup.

Scrubbing and wet methods

Auto scrubbers lay down solution, scrub, and pick the slurry back up in one pass, so dust is captured wet. They are often the best choice for production bays and dock aprons where fine dust settles into a film. Wet sweeping by hand (misting the floor before sweeping, or using a sweeping compound) is an accepted low-dust option for small areas and corners the machine cannot reach.

HEPA vacuums for edges and equipment

Industrial HEPA vacuums handle machine bases, pits, ledges and rack beams. They replace the air hose for most surface cleaning. The vacuum's own filter has to be emptied and changed in a way that does not release the dust again, which is easy to forget.

Sequence and timing

Clean from high to low, and capture dust before it is tracked. Many plants run the sweeper or scrubber at shift change, when foot and forklift traffic is lowest. Spills of bagged silica material should be cleaned the same shift, not left for the weekly route.

What a contractor should put in writing

If an outside crew cleans your floors, their work falls inside your exposure picture. Under the general industry standard, an employer with exposures at or above the action level needs a written exposure control plan, and housekeeping methods belong in it. Your cleaning scope should line up with that plan. A useful scope covers:

• Which zones are silica zones, and which method is used in each
• The machines and filter types on site, and the filter change interval
• A clear statement that dry brooms and compressed air are not used in those zones
• How waste from hoppers, recovery tanks and vacuums is bagged and disposed of
• Who supplies respirators or other protection if the site requires it for the cleaning crew
• Timing, so cleaning does not happen next to a running process that is already near the limit

Ask any vendor to walk the floor with your safety lead before the first visit. A short walkthrough settles most of these points, and our cost guide explains how dust-control equipment changes typical pricing.

A note for Canadian facilities

The OSHA rule applies in the United States. In Canada, workplace exposure limits are set by each province or territory, for example under Ontario Regulation 833, the WorkSafeBC Occupational Health and Safety Regulation, and Quebec's Regulation respecting occupational health and safety. Limits and housekeeping wording differ by jurisdiction, and several reference the ACGIH threshold limit value of 0.025 mg/m³. Plants with sites on both sides of the border often adopt the stricter practice everywhere so crews learn one routine.

Combustible dust is a separate question

Plants that also handle combustible dust (wood, flour, sugar, plastics, some metals) follow NFPA 652 and related standards, which also discourage blowing dust with compressed air. Where both hazards exist, the plan has to satisfy both.

Frequently asked questions

Does OSHA ban dry sweeping completely?

No. The silica standard prohibits dry sweeping and dry brushing only where they could contribute to employee exposure to respirable crystalline silica, and only when wet sweeping, HEPA vacuuming or another low-dust method is feasible. So if your floor has silica dust and a low-dust method exists, dry sweeping in that area is not allowed.

Is a ride-on floor sweeper considered dry sweeping under the silica rule?

It depends on the machine and how it is run. A sweeper that throws dust into the air behaves a lot like a broom, while a machine with active vacuum dust control, suitable filtration and sometimes a water spray is the kind of low-dust method the rule points toward. The employer should be able to explain why the chosen machine minimizes exposure, ideally backed by air monitoring.

Can we still use compressed air to clean machines and ledges?

Only where it will not add to silica exposure, or when it is paired with a ventilation system that captures the dust, or when no other method is feasible. For most ledges, machine bases and rack beams, a HEPA vacuum does the job and avoids the question entirely.

Does the silica rule apply to warehouses?

It applies to any workplace where employees can be exposed to respirable crystalline silica, so a warehouse handling bagged cement, sand or similar materials can fall under it. A warehouse with no silica-containing materials and no concrete grinding work usually will not reach the action level, but that should be confirmed with data rather than assumed.

Get a dust-control floor plan for your site

If your floors carry concrete, sand, stone or foundry dust, tell us about the building, the materials you handle and your shift pattern through the quote form. A specialist reviews the zones with you and sends a written route that covers equipment, filtration and timing.