Slate Shingles AHA (Activity Hazard Analysis / Job Hazard Analysis)
Updated 2026-06-23
A Slate Shingles AHA (Activity Hazard Analysis / Job Hazard Analysis) is the plan that keeps the crew installing slate shingles safe from the steep-slope roof fall, from the heavy slate handling and load, and around the slate cutting dust and tools. Slate shingles installs natural slate roofing — combining the steep-slope-roof-fall hazard, the heavy-slate-handling and load hazard, and the slate-cutting-dust and tool hazard. This guide walks through building a Slate Shingles AHA that names the steep-slope-roof-fall, heavy-slate-handling/load, and slate-cutting- dust/tool hazards and assigns the fall, handling/load, and cutting controls that hold up in the field.
Why slate shingles needs its own AHA
Slate shingles is the installation of natural slate roofing — the natural stone slate shingles/tiles installed on sloped roofs as a premium, heavy, durable steep-slope roofing. This continues the steep-slope roofing group, focused on slate. The defining feature is the same steep-slope fall hazard as asphalt shingles, sharpened by the slate material: slate is natural stone — very heavy (a major handling and roof-load concern beyond asphalt shingles) and brittle — and cutting/shaping slate generates silica-containing stone dust (slate is a stone, so cutting it is a silica-dust concern) with hammer/tool work. The hazards combine the steep-slope-roof-fall (working on the pitched roof — the fall hazard, sharpened because the heavy slate and the slate surface can be slippery), the heavy-slate-handling and load (handling the very heavy slate and the roof load — the handling and structural-load hazards), the slate-cutting-dust and tool (cutting/shaping the slate — the silica-dust and tool hazards), and the eye. The steep-slope-roof-fall and the heavy-slate-handling/load justify a dedicated AHA.
Breaking slate shingles into steps
The steps for a Slate Shingles AHA follow the work:
- Assess the roof (slope, load capacity, access)
- Set up steep-slope fall protection and safe roof access
- Load and stage the heavy slate (roof-load distribution)
- Cut and shape the slate (silica dust)
- Install and fasten the slate shingles
- Manage the fall, load, and dust hazards
- Complete
Each step carries a hazard, and the steep-slope-roof-fall, the heavy-slate-handling/load, and the slate-cutting- dust/tool are where the most significant risks concentrate.
The hazards step by step
Steep-slope-roof-fall
Working on the pitched roof — the fall hazard, sharpened because the heavy slate and the slate surface can be slippery. The controls are steep-slope fall protection (slate is installed on sloped/pitched roofs — the fall hazard is dominant (slope slip-off, eave/edge falls), and it is sharpened because slate is heavy (handling heavy material on a slope) and the finished slate surface can be smooth/slippery, so fall protection appropriate to steep-slope roofing (personal fall arrest with anchored lifelines, roof brackets/jacks and toe boards, staging), safe roof access, and slip-resistant footwear), and the fall controls. The steep-slope-roof-fall is the primary defining hazard — pitched-roof work, sharpened by heavy/slippery slate. (These follow the steep-slope fall- protection fundamentals.)
Heavy-slate-handling and load
Handling the very heavy slate and the roof load — the handling and structural-load hazards. The controls are heavy-slate-handling and load controls (natural slate is very heavy (much heavier than asphalt shingles — a significant manual-handling hazard getting the heavy slate onto and around the roof, and a real ergonomic/lifting concern), and the roof load is a concern (the concentrated weight of staged slate must be distributed and the structure must support the heavy slate roof — roof-load distribution so staged slate is not concentrated), so safe lifting/handling of the heavy material, mechanical assistance/hoisting where possible, and roof-load management), and the handling/load controls. The heavy-slate-handling/load is a defining hazard — slate is very heavy, a handling and roof-load concern. (These follow the material-handling and structural-load fundamentals.)
Slate-cutting-dust and tool
Cutting/shaping the slate — the silica-dust and tool hazards. The controls are slate-cutting-dust and tool controls (cutting and shaping slate generates stone dust, and because slate is a natural stone, the dust contains crystalline silica — a silica-dust inhalation hazard, so silica dust controls (wet cutting or dust extraction where power- cutting, respiratory protection appropriate to silica), and the slate-cutting tools (slate cutters, hammers, and saws — the tool and cut/impact hazards)), and the cutting-dust/tool controls. The slate-cutting-dust/tool is a defining hazard — cutting slate is a silica-dust hazard. (These follow the silica and tool fundamentals.)
Eye
The eye (slate dust, chips, tool debris) carries the eye hazard. The controls are eye protection (slate dust, flying slate chips, and tool debris — brittle slate produces sharp chips), and the eye controls. (These follow the eye-protection fundamentals.)
A simple Slate Shingles AHA structure
| Step | Hazard | Control | Standard |
|---|---|---|---|
| Assess | Fall / load | Assess the roof (slope, load capacity, access) | project |
| Fall protection | Fall | Set up steep-slope fall protection and safe roof access | OSHA 1926.501 |
| Load | Strain / load | Load and stage the heavy slate (roof-load distribution) | project |
| Cut | Silica | Cut and shape the slate (silica dust) | OSHA 1926.1153 |
| Install | Fall | Install and fasten the slate shingles | project |
| Manage | Fall / dust | Manage the fall, load, and dust hazards | project |
Steep-slope fall protection and heavy-slate-handling/load control
A Slate Shingles AHA centers on steep-slope fall protection and heavy-slate-handling/load control. The steep-slope fall protection addresses the pitched-roof work — controlled by steep-slope fall protection (personal fall arrest, roof brackets/jacks and toe boards, safe access, slip-resistant footwear). The heavy-slate-handling/load control addresses the heavy slate — controlled by heavy-slate-handling and load controls (safe lifting, mechanical assistance, roof-load distribution). And the cutting dust, tools, and eye get cutting-dust/tool and eye controls. An AHA built on steep-slope fall protection and heavy-slate-handling/load control, with cutting-dust controls, addresses the hazards that define slate shingles.
From the field: what actually goes wrong
In fourteen years across federal, heavy civil, and industrial projects, slate shingles installs natural stone slate roofing on sloped roofs, and its hazards are the steep-slope roofing profile sharpened by the slate material. The steep-slope-roof-fall hazard is a primary defining concern — slate is installed on sloped/pitched roofs, where the fall hazard is dominant (slope slip-off, eave/edge falls), and it is sharpened because slate is heavy (handling heavy material on a slope adds to the difficulty and the fall risk) and the finished slate surface can be smooth and slippery, so fall protection appropriate to steep-slope roofing (personal fall arrest with anchored lifelines, roof brackets/jacks and toe boards, staging), safe roof access, and slip-resistant footwear are central. The steep-slope fall is the defining hazard.
The heavy-slate-handling/load and the slate-cutting-dust/tool are the other defining hazards, and they are slate-specific. On the projects I have run, natural slate is very heavy — much heavier than asphalt shingles — so there is a significant manual-handling hazard getting the heavy slate onto and around the roof (an ergonomic and lifting concern), and the roof load is a real concern (the concentrated weight of staged slate must be distributed, and the structure must support the heavy slate roof), so safe lifting and handling of the heavy material, mechanical assistance or hoisting where possible, and roof-load management matter. And the slate-cutting-dust/tool hazard is important and sometimes overlooked: cutting and shaping slate generates stone dust, and because slate is a natural stone, that dust contains crystalline silica — a silica-dust inhalation hazard — so silica dust controls (wet cutting or dust extraction where power-cutting, respiratory protection appropriate to silica) apply, along with the slate-cutting tools (slate cutters, hammers, and saws — tool and cut/impact hazards, and brittle slate produces sharp flying chips). The eye hazard from slate dust and chips rounds it out. The AHA built on steep-slope fall protection and heavy-slate-handling/load control is the one that protects the slate crew.
The bottom line
A Slate Shingles AHA names the steep-slope-roof-fall, the heavy-slate-handling/load, and the slate-cutting-dust/ tool hazards with specific controls — steep-slope fall protection (personal fall arrest, roof brackets/jacks and toe boards, safe access, slip-resistant footwear), heavy-slate-handling and load controls (safe lifting, mechanical assistance, roof-load distribution for the very heavy slate), and slate-cutting-dust and tool controls (silica dust controls — wet cutting/dust extraction and respiratory protection, safe cutting tools). The steep- slope fall protection and the heavy-slate-handling/load control are the defining concerns. The AHA that manages both is the one that protects the crew.
Frequently asked questions
Why is the steep-slope fall the dominant hazard, sharpened for slate?
Slate is installed on sloped/pitched roofs (dominant slope slip-off and eave/edge fall hazard), and it is sharpened because slate is heavy (handling heavy material on a slope) and the finished slate surface can be smooth/slippery. Controls are steep-slope fall protection (personal fall arrest with anchored lifelines, roof brackets/jacks and toe boards, staging, safe access, slip-resistant footwear), and the fall controls.
Why is heavy-slate handling and load a defining hazard?
Natural slate is very heavy (much heavier than asphalt shingles), so there is a significant manual-handling/lifting hazard getting it onto and around the roof, and the roof load is a concern (concentrated staged weight must be distributed, and the structure must support the heavy slate roof). Controls are heavy-slate-handling and load controls (safe lifting, mechanical assistance/hoisting where possible, roof-load distribution), and the handling/load controls.
Why is cutting slate a silica-dust hazard?
Cutting and shaping slate generates stone dust, and because slate is a natural stone, that dust contains crystalline silica — a silica-dust inhalation hazard. Controls are slate-cutting-dust and tool controls (silica dust controls — wet cutting or dust extraction where power-cutting, respiratory protection appropriate to silica; safe slate-cutting tools — cutters, hammers, saws), and the cutting-dust/tool controls.
What is slate shingles?
Slate shingles is the installation of natural slate roofing — the natural stone slate shingles/tiles installed on sloped roofs as a premium, heavy, durable steep-slope roofing. Because steep-slope roofs have the dominant fall hazard (sharpened by heavy/slippery slate), the natural stone is very heavy (handling and roof load), and cutting it generates silica dust, those hazards apply.
Related AHAs and JHAs
- Asphalt Shingles AHA — the related asphalt-shingle roofing
- Roof Tiles AHA — the related roof-tile roofing
- Clay Roof Tiles AHA — the related clay-tile roofing
- Roof Work JHA — the roof-work fundamentals
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.