The rule, in the numbers that matter
OSHA's Respirable Crystalline Silica standard for construction is codified at 29 CFR 1926.1153. It went into effect September 23, 2017, with full enforcement starting June 23, 2018, after OSHA's interim enforcement policy wound down. The rule established a permissible exposure limit (PEL) of 50 µg/m³ as an 8-hour time-weighted average (TWA) and an action level (AL) of 25 µg/m³ TWA. These are roughly one-fifth of the pre-2017 PEL.
The rule gives construction employers two compliance pathways:
- Specified Exposure Control Methods (Table 1) at 29 CFR 1926.1153(c) — if the task is on Table 1 and the contractor fully implements the listed controls, the contractor is deemed compliant without personal air monitoring.
- Alternative Exposure Control Methods at 29 CFR 1926.1153(d) — requires objective data or personal air sampling to demonstrate exposures stay below the PEL, plus a written exposure control plan.
Nearly every masonry and concrete contractor runs under Table 1. It is simpler and predictable. It is also where the productivity hit lives, because the control methods are not free.
What Table 1 requires for the common masonry and concrete tasks
Table 1 lists 18 specific tasks. For masonry and concrete, the relevant entries are:
| Task (Table 1 row) | Required engineering control | Respirator if ≤ 4 hrs | Respirator if > 4 hrs |
|---|---|---|---|
| Stationary masonry saws | Integrated water delivery continuously wetting the blade | None required | None required |
| Handheld power saws (masonry/concrete) | Integrated water delivery OR tool-integrated HEPA vac dust collection | None (outdoor) / APF 10 (indoor) | APF 10 |
| Handheld grinders (masonry, concrete) | Tool-mounted shroud + HEPA vac dust collection | None (outdoor) / APF 10 (indoor) | APF 10 |
| Walk-behind saws (cutting slab/curb) | Integrated water delivery | None (outdoor) | APF 10 (enclosed) |
| Drivable saws | Integrated water delivery | None (outdoor) | N/A |
| Rotary hammers / drills | Tool-mounted shroud + HEPA vac, OR a commercially available drill dust collection system | None required | None required |
| Jackhammers / handheld breakers | Continuous water delivery OR HEPA vac dust collection | None (outdoor) / APF 10 (indoor) | APF 10 |
| Enclosed cab equipment (skid steer, excavator w/ breaker) | Filtered, pressurized cab per 1926.1153(c)(1) | None required | None required |
APF 10 is an Assigned Protection Factor 10 respirator — typically a half-mask air-purifying respirator with P100 filters. The cartridges are the consumable the bidder misses.
Respirator cartridge burn rate — a specific number
P100 cartridges for a half-mask APR (3M 2091, Moldex 7940, etc.) retail at $3.20-$4.80 per cartridge pair in contractor quantities. OSHA Respiratory Protection Standard 29 CFR 1910.134 requires cartridges be changed per the manufacturer's recommended schedule or when the user detects breakthrough — for P100 filters loaded with masonry dust, the practical change interval is per shift or per four hours of continuous cutting, whichever comes first.
Field data from masonry contractors we have benchmarked shows:
Avg cuts per cartridge pair change = 18-26 LF
Avg cartridge cost per LF cut = $0.18 to $0.26
Cartridge burn rate on concrete grinding/cutting:
Avg cartridge cost per LF cut = $0.42 to $0.68
Plus fit testing at $55-$85/worker/year and medical clearance at $110-$180/worker/year
On a masonry package with 3,500 LF of block cutting, that is $630-$910 in cartridges alone. On a concrete sawcutting package with 1,200 LF, that is $504-$816. Small numbers, consistent line items, frequently omitted.
Medical surveillance — the 30-day threshold
29 CFR 1926.1153(h) requires employers to offer medical surveillance at no cost to employees who are required to wear a respirator for 30 or more days per year under the silica rule. The initial exam includes a medical and work history, physical exam, chest X-ray (or equivalent imaging), pulmonary function test, latent tuberculosis test, and a physician's written opinion. Follow-up every three years thereafter.
Typical cost per worker for the initial exam bundle: $285-$420; triennial follow-up: $165-$240. For a 12-person masonry crew fully subject to surveillance, that is $3,420-$5,040 in the first year and $1,980-$2,880 every third year. Distribute across projects as overhead or embed in burdened labor.
Written Exposure Control Plan
Even under Table 1, 29 CFR 1926.1153(g) requires a written exposure control plan, designation of a competent person, and housekeeping practices that prohibit dry sweeping and dry compressed air cleanup where doing so would create exposure. The plan is project-specific for larger contracts; most masonry/concrete contractors maintain a master plan that is adapted per project. Budget 3-5 hours of safety manager time per project for plan customization and submittal to the GC's safety representative.
The productivity hit: CII RR-272 and field benchmarks
The Construction Industry Institute (CII) Research Report RR-272 and related productivity studies on dust-suppression controls have repeatedly found that engineered dust controls impose measurable productivity losses versus unsuppressed operation. For CMU cutting specifically, published loss factors run 10-15% due to wet saw setup, water management, slurry cleanup, and cartridge-change interruptions. Data from OSHA's preliminary economic analysis in the rule's preamble (81 FR 16286, March 25, 2016) showed similar figures for masonry grinding and concrete sawing.
A practical labor-hour impact table, assembled from CII work and contractor field data since the rule took effect:
| Task | Pre-rule LH/unit | Post-rule LH/unit | Productivity loss |
|---|---|---|---|
| CMU wet-sawing, 8x8x16 block (LF) | 0.042 LH/LF | 0.049 LH/LF | +16.7% |
| CMU handheld cutting at openings (LF) | 0.071 LH/LF | 0.082 LH/LF | +15.5% |
| Concrete grinding (SF) | 0.038 LH/SF | 0.045 LH/SF | +18.4% |
| Concrete sawcutting, walk-behind (LF) | 0.028 LH/LF | 0.031 LH/LF | +10.7% |
| Rotary-hammer drilling anchors (each) | 0.085 LH/ea | 0.092 LH/ea | +8.2% |
| Handheld jackhammer demolition (CY) | 3.8 LH/CY | 4.3 LH/CY | +13.2% |
| Enclosed-cab skid steer breaker (CY) | 1.4 LH/CY | 1.4 LH/CY | 0% (cab isolates) |
These numbers are field-calibrated and will vary with crew experience and site conditions, but the direction is consistent: any task requiring an APF 10 respirator and engineered dust control carries 10-18% more labor hours per unit than the pre-rule rate. If your 2016 production rates are still in your database and you have not re-baselined, your bids are systematically short on masonry and concrete labor.
Pricing silica compliance as a flat $/hr adder on the masonry line, or worse, rolling it into general conditions. The productivity hit is a per-unit labor-hour increase, not a flat cost. A 3,500 LF block-cut scope at the corrected 0.049 LH/LF runs 24.5 hours more than at the old 0.042 LH/LF — at a burdened $95/hr, that is $2,328 on one line item. Across a 240,000 SF masonry package, the accumulated miss is $18,000-$32,000.
Enclosed-cab carve-out
Per Table 1, operating equipment with a fully enclosed, pressurized, filtered cab meeting 29 CFR 1926.1153(c)(1) — MERV 16 filters, positive pressure, cab integrity testing — deems the operator compliant without respiratory protection. The cost is front-loaded: a properly rated enclosed cab adds $8,000-$18,000 to the equipment purchase or rental premium. On rentals, the cab-rated skid steer or mini-excavator with breaker runs 15-25% above a standard unit. The advantage is the zero-productivity-hit operation, which pencils out on larger demolition scopes.
"The first year after the rule hit, we lost two mid-size school jobs because we carried the old production rates. We thought we were competitive. The winning bids were $65K and $82K higher on the masonry line. That was the compliance wedge we had not priced. The next year we re-baselined every production rate off field data and started winning again."
Miguel Santana, Safety & Cost Director, Masonry — reflecting on post-rule bid calibration
Where the money actually goes on a compliant bid
A properly priced silica-compliant masonry bid carries four distinct lines that a pre-2017 bid did not:
- Re-baselined labor hours (10-18% higher per unit on cutting/grinding tasks)
- HEPA vac / wet-saw equipment rental or amortized ownership — typically $55-$120 per saw per week
- Respirator program consumables — cartridges, fit testing, cleaning — at $0.18-$0.68 per LF cut
- Medical surveillance — $285-$420/worker initial, $165-$240 triennial
Summed across a typical $800,000 CMU package, the silica wedge is 2.8-4.5% of the subtotal — real money, almost entirely in the labor and equipment columns, and structurally invisible to any estimator still using 2016 production rates or a flat GC adder.
Bid discipline since the rule took effect
Every masonry and concrete contractor should have re-baselined their production rate database against post-rule field data by now. If your rates still match your pre-2017 history book, you are either losing bids you should win (because your number is high — wait, that would make you low on labor and therefore winning bids you should lose) or you are executing at a loss. Both are ways to go out of business.