Core Drilling and Concrete Saw Cutting JHA (Job Hazard Analysis / Activity Hazard Analysis)
Updated 2026-06-23
A Core Drilling and Concrete Saw Cutting JHA (Job Hazard Analysis / Activity Hazard Analysis) is the plan that keeps the crew cutting and drilling concrete from breathing silica, hitting embedded utilities, or being injured by the blade and the core. Cutting and drilling concrete generates large amounts of respirable crystalline silica, blindly penetrates a material that may hide live electrical conduit, post- tension cables, or rebar, and uses powerful blades and bits that bind, kick, and produce heavy cores. This guide walks through building a Core Drilling and Concrete Saw Cutting JHA that names the silica, embedded-utility, and blade hazards and assigns the dust-control, scanning, and cutting controls that hold up in the field.
Why core drilling and saw cutting need their own JHA
Core drilling and concrete sawing cut into structural concrete to create openings and penetrations, and the operation carries three serious hazards. The first is silica: cutting and drilling concrete releases respirable crystalline silica, a known cause of silicosis and lung cancer, and these operations are among the highest silica-generating tasks on a site. The second is what is hidden in the concrete: electrical conduit, post-tension cables (which are under enormous tension and dangerous if cut), water and gas lines, and rebar can all be embedded in the slab or wall being cut, and hitting them causes electrocution, violent cable release, flooding, or blade binding. The third is the equipment itself: saws and core drills are powerful, the blades and bits bind and kick, and cores and cut sections are heavy and can fall. The combination justifies a dedicated JHA.
Breaking core drilling and saw cutting into steps
The steps for a Core Drilling and Concrete Saw Cutting JHA follow the cut from layout to removal:
- Identify and scan for embedded utilities and post-tension cables
- Confirm the cut/penetration is approved and will not compromise the structure
- Set up dust control — wet cutting or vacuum dust collection
- Secure the equipment and the area, including below the cut
- Make the cut or drill the core with proper technique
- Control and support the core or cut section against falling
- Manage slurry and dust during and after
- Remove the core, clean up, and finalize
Each step carries a hazard, and the scanning for embedments and the silica dust control are where the most serious harms are prevented.
The hazards step by step
Respirable crystalline silica
Cutting and drilling concrete generates high levels of respirable silica, and these are among the most silica-intensive tasks in construction. The controls follow the silica standard's hierarchy: engineering controls first — wet cutting/drilling that uses water to suppress the dust at the point of cut, or integrated vacuum dust collection — supplemented by respiratory protection where exposures remain. Wet methods are highly effective for concrete cutting and are the primary control. The exposure-control plan and the standard's specified methods govern.
Embedded utilities and post-tension cables
Concrete can hide live electrical conduit, post-tension cables, water and gas lines, and rebar. Cutting into electrical conduit electrocutes; cutting a post-tension cable releases its enormous stored tension violently and can be fatal; cutting water or gas lines floods or releases gas. The controls are scanning the concrete with ground-penetrating radar or other detection before cutting, obtaining and reviewing structural and utility drawings, confirming the location of post-tension cables and not cutting them without engineering involvement, and de-energizing/isolating utilities that may be embedded. The scan is not optional on a slab or wall that could contain embedments.
Blade and bit hazards
Saw blades and core bits bind, kick back, and shatter, and the cutting produces heavy cores and sections. The controls are proper blade/bit selection and inspection, secure mounting of core drill rigs (anchored so the rig does not spin or pull free), firm control of hand saws against kickback, eye and face protection, and supporting and controlling the core or cut section so it does not fall on the operator or the workers below.
Falling cores and cut sections
Cores and cut sections are heavy and fall when released — often through the slab onto the level below. The controls are controlling the core (core catchers, supporting the section), barricading the area below the cut, and planning for where the cut piece will go before it is freed.
A simple Core Drilling and Concrete Saw Cutting JHA structure
| Step | Hazard | Control | Standard |
|---|---|---|---|
| Scan concrete | Embedded utility / PT cable | GPR/scan, review drawings, locate post-tension cables | OSHA 1926.416 / structural review |
| Set up dust control | Silica | Wet method or vacuum collection, exposure-control plan | OSHA 1926.1153 |
| Secure rig and area | Equipment / fall | Anchor core rig, barricade below the cut | OSHA 1926.300 |
| Cut or drill | Blade bind / kickback | Correct blade/bit, firm control, eye/face protection | OSHA 1926.302 |
| Control the core | Falling core | Core catcher, support section, area below cleared | OSHA 1926.501 |
| Manage slurry | Slip / housekeeping | Contain and clean slurry, manage water | OSHA 1926.25 |
Scanning and wet cutting — the two essential controls
A Core Drilling and Concrete Saw Cutting JHA rests on two controls that address the two hazards unique to cutting concrete: scanning and wet cutting. Scanning the concrete before cutting is what prevents the embedded-utility disasters — the electrocution from cutting live conduit, and especially the violent, potentially fatal release of cutting a post-tension cable, which holds enormous stored tension. A slab or wall that could contain post-tension cables is not cut until it has been scanned and the cables located, with engineering involvement for any cut near them. Wet cutting is what controls the silica — water at the point of cut suppresses the dust that would otherwise be a major silica exposure. A JHA that requires the scan and the wet method controls the two hazards that make concrete cutting more dangerous than it looks.
From the field: what actually goes wrong
In fourteen years across federal, heavy civil, and industrial projects, the two concrete-cutting hazards that demand the most respect are the embedded post-tension cables and the silica. Post-tension cables are the catastrophic one: a PT cable holds enormous tension, and cutting one releases that energy violently — it can whip out of the slab with lethal force. The defense is scanning the concrete and locating the cables before any cut, and never cutting into a post-tension slab without knowing exactly where the cables run and involving the structural engineer. This is not a hazard to take on faith from old drawings; the scan confirms what is actually there. Cutting live electrical conduit is the other embedment hazard, and the scan plus utility isolation addresses it.
The silica is the cumulative one. Concrete cutting and core drilling are among the highest silica- generating tasks there are, and dry cutting fills the air with respirable silica that causes silicosis and lung cancer over years. On the projects I have run, wet cutting is the control that works — water at the blade or bit suppresses the dust dramatically, far better than relying on a respirator alone, and the silica standard requires these engineering controls for good reason. The blade hazards and falling cores round it out: a core drill rig that is not properly anchored can spin or pull free, and a heavy core dropped through a slab onto the level below is a serious struck-by. The JHA that scans before cutting, cuts wet, anchors the rig, and controls the core is the one that keeps the cutting crew safe from the hazards they cannot see.
The bottom line
A Core Drilling and Concrete Saw Cutting JHA names the silica, the embedded-utility, and the blade hazards with specific controls — scanning the concrete and locating post-tension cables before cutting, wet methods or vacuum collection for the silica, anchored rigs, and controlled cores. The hazards hidden in the concrete and the silica in the air are what make this task dangerous beyond the obvious. The JHA that requires the scan and the wet cut is the one that protects the crew.
Frequently asked questions
Why must concrete be scanned before cutting or core drilling?
Concrete can hide live electrical conduit, post-tension cables, water and gas lines, and rebar. Scanning with ground-penetrating radar and reviewing drawings before cutting prevents electrocution, flooding, and — most dangerously — cutting a post-tension cable, which releases enormous stored tension violently and can be fatal.
What happens if you cut a post-tension cable?
A post-tension cable holds enormous tension, and cutting one releases that energy violently — it can whip out of the slab with lethal force. A slab that could contain post-tension cables is not cut until it has been scanned, the cables are located, and the structural engineer is involved for any cut near them.
How is silica controlled when cutting concrete?
Core drilling and concrete sawing are among the highest silica-generating tasks on a site, controlled primarily by wet cutting and drilling that suppress the dust at the point of cut, or integrated vacuum dust collection, with respiratory protection where exposures remain — following the silica standard.
How is a falling core or cut section controlled?
Cores and cut sections are heavy and fall when released, often through the slab onto the level below. Controls are core catchers, supporting the cut section, barricading the area below the cut, and planning where the piece will go before it is freed.
Related JHAs
- Grinding and Abrasive Wheel Operations JHA — related silica and blade hazards
- Electrical Work JHA — isolating embedded electrical conduit
- Concrete Placement JHA — the concrete being cut and its embedments
- Hand and Power Tool Safety JHA — saw and drill tool safety
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.