Terrazzo Installation JHA (Job Hazard Analysis / Activity Hazard Analysis)
Updated 2026-06-23
A Terrazzo Installation JHA (Job Hazard Analysis / Activity Hazard Analysis) is the plan that keeps the terrazzo crew from breathing the silica generated by grinding and polishing, being exposed to the epoxy or cement binders, or worn down by the repetitive kneeling and material handling. Terrazzo flooring sets marble, glass, or stone chips in a cement or epoxy binder, then grinds and polishes the surface — and the grinding is a major silica source. This guide walks through building a Terrazzo Installation JHA that names the silica, chemical, and ergonomic hazards and assigns the dust-control, PPE, and handling controls that hold up in the field.
Why terrazzo installation needs its own JHA
Terrazzo is a composite floor finish — decorative chips (marble, granite, glass) set in a cementitious or epoxy binder, poured, cured, then ground and polished smooth. The hazards span the process. The grinding and polishing of the cured terrazzo generate substantial respirable crystalline silica (from the cement, the stone chips, and any concrete substrate), which is the dominant health hazard. Epoxy-binder terrazzo adds the chemical sensitization and vapor hazards of epoxy. The work is physically demanding — kneeling, material handling, operating heavy grinders. And wet processes create slip hazards. The combination of significant silica from grinding and the chemical and ergonomic hazards justifies a dedicated JHA.
Breaking terrazzo installation into steps
The steps for a Terrazzo Installation JHA follow the install:
- Prepare the substrate and set divider strips
- Mix the binder and chips (cement or epoxy)
- Pour and place the terrazzo
- Cure the terrazzo
- Grind and polish the cured surface (major silica step)
- Manage silica dust during grinding and polishing
- Seal and finish the floor
- Manage chemical, slip, and ergonomic hazards throughout
Each step carries a hazard, and the grinding and polishing (silica) and, for epoxy systems, the chemical exposure are where the most significant risks concentrate.
The hazards step by step
Respirable silica from grinding and polishing
Grinding and polishing cured terrazzo generates substantial respirable crystalline silica from the cement binder, the stone chips, and the substrate — this is the dominant terrazzo health hazard. The controls follow the silica standard: wet grinding and polishing (the common method, which suppresses the dust at the source) or vacuum dust collection, with respiratory protection where dust remains. Wet processing is highly effective and is standard for terrazzo grinding. Dry grinding terrazzo without dust control is a serious silica exposure.
Chemical exposure (epoxy binders)
Epoxy-binder terrazzo uses epoxy resins and hardeners that are skin and respiratory sensitizers, with the same hazards as epoxy flooring. The controls are chemical-resistant PPE, respiratory protection, ventilation, and careful handling to prevent skin contact and inhalation, preventing the often-permanent sensitization. Cement-binder terrazzo carries the caustic-cement skin hazard. (These follow the epoxy-flooring and concrete fundamentals.)
Ergonomic strain
Terrazzo installation is physically demanding — kneeling for extended periods to place and detail the terrazzo, handling heavy materials and grinders, and repetitive work. The controls are knee protection and pads, mechanical handling of heavy materials and grinders, task rotation, and good technique to reduce the strain of prolonged kneeling and material handling.
Slips and electrical/water hazards
The wet grinding and polishing create slip hazards and combine water with electrical grinding equipment. The controls are managing the wet floor and slurry, GFCI protection for electrical equipment in wet conditions, and keeping connections out of the water.
A simple Terrazzo Installation JHA structure
| Step | Hazard | Control | Standard |
|---|---|---|---|
| Mix binder | Chemical / caustic | Chemical PPE for epoxy, skin protection for cement | OSHA 1926.95 |
| Pour and place | Ergonomic strain | Knee pads, mechanical handling, task rotation | NIOSH ergonomic guidance |
| Grind and polish | Respirable silica | Wet grinding/polishing or vacuum collection, respirator | OSHA 1926.1153 |
| Manage dust | Silica | Wet methods, dust collection, respiratory protection | OSHA 1926.1153 |
| Wet processing | Slip / shock | Manage slurry, GFCI for wet conditions | OSHA 1926.404 |
| Epoxy systems | Sensitization | Chemical PPE, ventilation, avoid skin contact | OSHA 1926.59 |
Wet grinding for silica control
The defining control in a Terrazzo Installation JHA is wet grinding for silica, because the grinding and polishing of cured terrazzo is the dominant health hazard and a major silica source. Wet grinding and polishing suppress the respirable silica at the source — water on the grinding surface keeps the dust down — and it is the standard and effective method for terrazzo. Dry grinding terrazzo without dust control generates a serious silica exposure from the cement, chips, and substrate. A JHA built on wet grinding (or vacuum dust collection) for the silica, with chemical controls for epoxy binders and ergonomic controls for the kneeling and handling, addresses the hazards that define terrazzo work, with the silica from grinding as the central concern.
From the field: what actually goes wrong
In fourteen years across federal, heavy civil, and industrial projects, terrazzo is a finishing trade whose dominant hazard is silica, and it comes from the grinding and polishing. Cured terrazzo is ground and polished smooth, and that grinding generates substantial respirable silica from the cement binder, the stone chips, and the substrate — a serious exposure if done dry without dust control. The control is wet grinding and polishing, which is the standard method and suppresses the dust effectively, far better than relying on a respirator alone. The terrazzo workers who develop silicosis are the ones who ground dry without dust control. Wet processing also handles the dust from the start, which is why it is standard for the trade.
The chemical and ergonomic hazards are the other concerns. Epoxy-binder terrazzo brings the sensitization hazard of epoxy — the resins and hardeners are sensitizers, and skin contact and inhalation can sensitize a worker permanently — so chemical PPE and ventilation matter. Cement-binder terrazzo carries the caustic skin hazard. The ergonomics are real: terrazzo installation involves extended kneeling to place and detail the floor and handling heavy materials and grinders, wearing down knees and backs. On the projects I have run, knee protection, mechanical handling, and task rotation help. The wet processing creates slip hazards and combines water with electrical grinders, so GFCI protection and slurry management matter. The JHA built on wet grinding for silica, with chemical and ergonomic controls, is the one that protects the terrazzo crew.
The bottom line
A Terrazzo Installation JHA names the silica, the chemical, and the ergonomic hazards with specific controls — wet grinding and polishing for the dominant silica hazard, chemical PPE for epoxy binders and caustic cement, and knee protection and mechanical handling for the kneeling and material handling. The silica from grinding cured terrazzo is the central hazard. The JHA built on wet grinding is the one that protects the crew.
Frequently asked questions
Why is grinding terrazzo a silica hazard?
Grinding and polishing cured terrazzo generates substantial respirable crystalline silica from the cement binder, the stone chips, and the substrate — it is the dominant terrazzo health hazard. The control is wet grinding and polishing, which suppresses the dust at the source and is the standard method, or vacuum dust collection, with respiratory protection where dust remains.
Is epoxy-binder terrazzo a chemical hazard?
Yes. Epoxy-binder terrazzo uses epoxy resins and hardeners that are skin and respiratory sensitizers, with the same hazards as epoxy flooring — skin contact and inhalation can cause permanent sensitization. Controls are chemical-resistant PPE, respiratory protection, ventilation, and careful handling. Cement-binder terrazzo carries the caustic-cement skin hazard.
What ergonomic hazards does terrazzo work involve?
Terrazzo installation is physically demanding — extended kneeling to place and detail the floor, handling heavy materials and grinders, and repetitive work — straining knees and backs. Controls are knee protection and pads, mechanical handling of heavy materials and grinders, task rotation, and good technique.
Why use wet grinding for terrazzo?
Wet grinding and polishing suppress the respirable silica at the source by keeping water on the grinding surface, which is far more effective than relying on a respirator alone against the substantial silica that grinding cured terrazzo generates. It is the standard and effective method for the trade, and it also manages the dust from the start.
Related JHAs
- Epoxy Flooring Installation JHA — related epoxy chemical hazards
- Core Drilling and Concrete Saw Cutting JHA — related silica controls
- Concrete Placement JHA — the concrete substrate
- Grinding and Abrasive Wheel Operations JHA — grinding silica control
Written by Mustafa Tok, CSP, ASP, CHST — OSHA Authorized Outreach Trainer with 14+ years of international construction safety experience across federal, heavy civil, and industrial projects.