Stone countertop fabricators — cutting, grinding, polishing, and finishing granite, marble, and engineered stone for residential and commercial installation — work with diamond blade saws, angle grinders, and polishing equipment that generate sustained high-level noise in enclosed shop environments. Stone cutting and grinding noise is among the highest-level sustained noise in any small-shop manufacturing setting, yet the stone fabrication sector is rarely targeted for hearing conservation compliance. The CDC estimates 22 million U.S. workers face hazardous occupational noise each year, and stone countertop fabricators are a meaningful segment of that total.
Soundtrace provides automated audiometric testing, real-time noise monitoring, and HPD fit testing in a unified platform for employers across the industries where stone countertop fabricators work.
Stone fabrication shops are general industry employers subject to OSHA 1910.95. Bridge saws cutting granite and engineered stone routinely produce noise levels of 96–108 dBA at the operator position. Angle grinders used for edge profiling and sink cutouts reach 98–108 dBA. Many stone fabrication shops are small businesses that have never conducted noise monitoring, placing both the workers and the employer at unmanaged risk.
Measured Noise Exposure Levels
| Operation | Typical Noise Level | OSHA Max Duration |
|---|---|---|
| Bridge saw (granite, full cut) | 96–108 dBA | Duration of cutting |
| CNC router / profiler (stone edge) | 94–104 dBA | Duration of routing |
| Angle grinder (edge profiling) | 96–108 dBA | Duration of grinding |
| Polisher (wet, stone finishing) | 88–98 dBA | Duration of polishing |
| Core drill (sink cutout) | 96–106 dBA | Duration of drilling |
| Air blow-off (stone cleaning) | 88–100 dBA | Intermittent |
| Shop ambient (multiple stations) | 88–98 dBA | Full shift |
OSHA Requirements
Under 29 CFR 1910.95, employers must implement a hearing conservation program when any worker's 8-hour TWA meets or exceeds 85 dBA. Required elements:
- Noise monitoring to establish documented TWA for each exposed worker
- Baseline audiogram within 6 months of first qualifying exposure (preceded by 14 hours of quiet)
- Annual audiograms compared to baseline for standard threshold shift (STS) detection
- Hearing protection provided at no cost in a variety of types and styles
- Annual training covering noise hazards, HPD use, and audiometric results
- Recordkeeping per 1910.95(m) — noise measurements, audiograms, training documentation
See: OSHA 1910.95: All 6 Elements Explained
Silica and Noise: A Combined Hazard
Stone fabrication workers face simultaneous respiratory and auditory hazards — dry cutting and grinding of granite and engineered stone generates respirable crystalline silica dust while simultaneously producing noise above 100 dBA. OSHA's silica standard (1910.1053) and noise standard (1910.95) both apply to stone fabrication operations.
The silica and noise hazards reinforce each other in terms of engineering control strategy: wet cutting and vacuum extraction that controls silica exposure also reduces airborne dust that amplifies sound energy, and enclosures that reduce noise also reduce silica dispersal in the shop. Where feasible, integrated wet-process controls address both hazards simultaneously.
Hearing protection remains essential even with wet cutting — noise levels are high enough that respiratory protection alone, without concurrent HPD, leaves workers inadequately protected on the auditory side.
See: Cement Mason Hearing Loss and OSHA 1910.95: All 6 Elements Explained
Workers' Compensation Exposure
Occupational hearing loss WC claims are routinely filed years or decades after the causative exposure. Without a documented baseline audiogram, employers cannot establish what hearing the worker had at hire — making every dB of loss present at claim filing presumptively attributable to the current employer.
A complete audiometric record, maintained from day one of employment, is the only document that allows an employer to separate their noise exposure period from everything that came before and after.
See: Workers' Compensation for Occupational Hearing Loss and Noise-Induced Hearing Loss: The Employer's Complete Guide
Frequently Asked Questions
Yes, when their 8-hour TWA meets or exceeds 85 dBA. Many stone countertop fabricators in active operations regularly meet this threshold. OSHA 1910.95 requires employers to enroll qualifying workers in a hearing conservation program including audiometric testing, hearing protection, training, and recordkeeping.
Noise-induced hearing loss (NIHL) is the primary occupational hearing condition. It typically presents first as a 4,000 Hz notch on audiometry before progressing over years to involve 3,000 and 6,000 Hz. The loss is permanent and irreversible once established.
Yes. Occupational hearing loss is compensable in all U.S. states when a worker can establish that their hearing loss was caused or contributed to by workplace noise exposure. Claims are routinely filed years or decades after the exposure period.
A compliant hearing conservation program includes noise monitoring, baseline and annual audiograms, hearing protection at no cost, annual training, and complete recordkeeping. Individual HPD fit testing — measuring each worker's personal attenuation rating — is the only method that verifies actual protection rather than assuming label NRR performance.
Hearing protection must provide adequate attenuation for the actual measured TWA. Individual fit testing verifies each worker's personal attenuation rating (PAR). At higher exposure levels, double protection combining earplug and earmuff is often required.
In-house audiometric testing for construction operations
Soundtrace delivers OSHA-compliant audiometric testing and noise monitoring for construction employers — automated STS detection, 30-year cloud retention, and licensed audiologist supervision.
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