Cold-Formed Metal Trusses AHA (Activity Hazard Analysis / Job Hazard Analysis)
Updated 2026-06-23
A Cold-Formed Metal Trusses AHA (Activity Hazard Analysis / Job Hazard Analysis) is the plan that keeps the crew erecting cold-formed metal trusses safe through the truss stability and bracing during erection, from the fall and at-height truss work, and around the sharp edges and handling. Cold-formed metal trusses erects light-gauge steel trusses — combining the truss-stability and bracing-during-erection hazard, the fall and at-height-truss- work hazard, and the sharp-edge and handling hazard. This guide walks through building a Cold-Formed Metal Trusses AHA that names the truss-stability/bracing-during-erection, fall/at-height-truss-work, and sharp-edge/ handling hazards and assigns the bracing, fall, and handling controls that hold up in the field.
Why cold-formed metal trusses needs its own AHA
Cold-formed metal trusses are trusses fabricated from cold-formed (light-gauge) steel — used for roofs and floors, erected as pre-fabricated truss units and braced together into the roof/floor structure (the light-gauge steel equivalent of wood roof trusses). This continues the cold-formed cluster. The defining feature is the truss erection: like all trusses, cold-formed trusses are unstable until braced (an unbraced truss can tip, buckle, or collapse — and a row of unbraced trusses can domino), the work is at height (roof/floor truss erection), and the light-gauge steel has the sharp edges of the cold-formed cluster. The hazards combine the truss-stability and bracing-during-erection (trusses are unstable until braced — the stability hazard (an individual truss and a row of trusses are unstable until braced — an unbraced truss can tip, buckle, or collapse, and unbraced trusses can domino-collapse — requiring proper temporary and permanent bracing during erection)), the fall and at-height- truss-work (erecting trusses at height — the fall hazard (roof/floor truss erection at height)), the sharp-edge and handling (the light-gauge steel sharp edges and the truss handling — the laceration and handling hazards), and the rigging/connection. The truss-stability/bracing-during-erection and the fall/at-height-truss-work justify a dedicated AHA.
Breaking cold-formed metal trusses into steps
The steps for a Cold-Formed Metal Trusses AHA follow the erection:
- Plan the truss erection (sequence, bracing, fall protection)
- Set up fall protection for the truss work
- Rig/hoist and set the trusses (attach before release)
- Brace each truss and the truss run (stability)
- Verify bracing before loading/decking the trusses
- Manage the stability, fall, and handling hazards
- Sheath/deck the trusses per the sequence
- Complete
Each step carries a hazard, and the truss-stability/bracing-during-erection, the fall/at-height-truss-work, and the sharp-edge/handling are where the most significant risks concentrate.
The hazards step by step
Truss-stability and bracing-during-erection
Trusses are unstable until braced — the stability hazard (an individual truss and a row of trusses are unstable until braced — an unbraced truss can tip, buckle, or collapse, and unbraced trusses can domino-collapse — requiring proper temporary and permanent bracing during erection). The controls are bracing the trusses during erection (an erected truss is not stable on its own — temporary bracing must be installed as each truss is set, and the truss run must be braced to prevent the trusses from tipping or dominoing; an unbraced truss can buckle or collapse, and a row of unbraced trusses can domino-collapse — following the truss bracing requirements for temporary and permanent bracing, and not loading the trusses before bracing is complete), and the stability/ bracing controls. The truss-stability/bracing-during-erection is the primary defining hazard — unbraced trusses can tip, collapse, or domino. (These follow the truss-bracing fundamentals.)
Fall and at-height-truss-work
Erecting trusses at height — the fall hazard (roof/floor truss erection at height). The controls are fall protection for the truss work (erecting and working on the trusses at height — fall protection, safe access), and the fall controls. The fall/at-height-truss-work is a defining hazard — truss erection is at height. (These follow the fall-protection fundamentals.)
Sharp-edge and handling
The light-gauge steel sharp edges and the truss handling — the laceration and handling hazards. The controls are cut-resistant protection against the sharp light-gauge steel edges (the cold-formed truss members have sharp edges — cut-resistant gloves/sleeves), safe handling/rigging of the trusses (the truss units — handling, rigging, sharp edges), and the sharp-edge/handling controls. The sharp-edge/handling is a defining hazard. (These follow the sharp-material and handling fundamentals.)
Rigging/connection
The rigging and connection (rigging the trusses, connecting them — screws/welds) carries the rigging/connection hazard. The controls are safe rigging (rated rigging, attaching before releasing), safe connection, and the rigging/connection controls. (These follow the rigging fundamentals.)
A simple Cold-Formed Metal Trusses AHA structure
| Step | Hazard | Control | Standard |
|---|---|---|---|
| Plan | Truss collapse | Plan the truss erection (sequence, bracing, fall) | project |
| Fall protection | Fall | Set up fall protection for the truss work | OSHA 1926.501 |
| Set trusses | Struck-by | Rig/hoist and set the trusses (attach before release) | project |
| Brace | Truss collapse | Brace each truss and the truss run (stability) | project |
| Verify | Truss collapse | Verify bracing before loading/decking the trusses | project |
| Sheath/deck | Fall | Sheath/deck the trusses per the sequence | project |
Truss-bracing stability control and fall/handling safety
A Cold-Formed Metal Trusses AHA centers on truss-bracing stability control and fall/handling safety. The truss-bracing stability control addresses the unstable trusses — controlled by bracing the trusses during erection (temporary bracing as each truss is set, bracing the truss run to prevent tipping/dominoing, not loading before bracing is complete), since unbraced trusses can collapse or domino. The fall/handling safety addresses the at-height work and the sharp material — controlled by fall protection for the truss work and cut-resistant protection/safe handling of the trusses. And the rigging/connection gets rigging controls. An AHA built on truss-bracing stability control and fall/handling safety, with rigging controls, addresses the hazards that define cold-formed metal trusses.
From the field: what actually goes wrong
In fourteen years across federal, heavy civil, and industrial projects, cold-formed metal trusses erects light-gauge steel trusses for roofs and floors, and its defining hazard is the classic truss-erection hazard: instability until braced. The truss-stability and bracing-during-erection hazard is the primary defining concern — like all trusses (wood or steel), cold-formed metal trusses are unstable until they are braced: an individual erected truss standing on its own can tip over, buckle, or collapse, and a row of erected but unbraced trusses is especially dangerous because they can domino-collapse (one truss falling into the next, collapsing the whole run), which has killed workers on and under truss runs. So bracing the trusses during erection is the critical control: installing temporary bracing as each truss is set (not leaving trusses standing unbraced), bracing the truss run to prevent tipping and dominoing, following the truss bracing requirements for both temporary erection bracing and permanent bracing, and not loading the trusses (with sheathing, deck, or workers concentrating on them) before the bracing is complete. The unbraced-truss collapse and domino are the defining truss-erection hazards.
The fall/at-height-truss-work and the sharp-edge/handling are the other defining hazards. On the projects I have run, truss erection is at height (roof and floor trusses), so fall protection for the truss work (fall protection and safe access while erecting and working on the trusses) is a control. And the sharp-edge/handling hazard carries over from the cold-formed cluster — the light-gauge steel truss members have the same extremely sharp edges that cause lacerations (cut-resistant gloves and sleeves), and handling and rigging the truss units brings the handling hazard (including the sharp edges). The rigging and connection (rated rigging, attaching before releasing, connecting with screws or welds) round it out. The AHA built on truss-bracing stability control and fall/handling safety is the one that protects the truss-erection crew.
The bottom line
A Cold-Formed Metal Trusses AHA names the truss-stability/bracing-during-erection, the fall/at-height-truss-work, and the sharp-edge/handling hazards with specific controls — bracing the trusses during erection (an unbraced truss can tip, buckle, or collapse, and a truss run can domino — install temporary bracing as trusses are set, brace the run, do not load before bracing is complete), fall protection for the at-height truss work, and cut- resistant protection against the sharp light-gauge edges with safe handling. The truss-bracing stability control and the fall/handling safety are the defining concerns. The AHA that manages both is the one that protects the crew.
Frequently asked questions
Why must cold-formed trusses be braced during erection?
Like all trusses, cold-formed metal trusses are unstable until braced: an individual erected truss can tip over, buckle, or collapse, and a row of erected but unbraced trusses can domino-collapse (one truss falling into the next, collapsing the whole run), which has killed workers. Controls are bracing the trusses during erection (installing temporary bracing as each truss is set, bracing the truss run to prevent tipping/dominoing, following the truss bracing requirements, not loading the trusses before bracing is complete), and the stability/bracing controls.
What fall hazards apply?
Truss erection is at height (roof and floor trusses). Controls are fall protection for the truss work (fall protection, safe access while erecting and working on the trusses), and the fall controls.
What sharp-edge and handling hazards apply?
The light-gauge steel truss members have the same extremely sharp edges as cold-formed framing (causing lacerations), and handling and rigging the truss units brings the handling hazard. Controls are cut-resistant protection against the sharp light-gauge steel edges (cut-resistant gloves/sleeves), safe handling/rigging of the trusses (handling, rigging, sharp edges), and the sharp-edge/handling controls.
What are cold-formed metal trusses?
Cold-formed metal trusses are trusses fabricated from cold-formed (light-gauge) steel — used for roofs and floors, erected as pre-fabricated truss units and braced together into the roof/floor structure. Because unbraced trusses can tip, collapse, or domino, the erection is at height, and the light-gauge steel has sharp edges, those hazards apply.
Related AHAs and JHAs
- Cold-Formed Metal Framing AHA — the cold-formed framing fundamentals
- Longspan Steel Joist Framing AHA — the related joist stability/bracing
- Miscellaneous Steel Installation JHA — related steel-installation work
- Steel Erection JHA — the steel-erection 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.