Roof Deck Repair JHA (Job Hazard Analysis / Activity Hazard Analysis)
Updated 2026-06-23
A Roof Deck Repair JHA (Job Hazard Analysis / Activity Hazard Analysis) is the plan that keeps the crew repairing a roof deck from falling through the compromised deck, causing a fire welding the deck, or being injured handling the deck materials. Roof deck repair replaces or reinforces the damaged structural roof deck exposed during re-roofing — combining the fall-through hazard of working on a compromised deck, the hot-work hazards of welding metal deck, and the deck-material handling. This guide walks through building a Roof Deck Repair JHA that names the fall-through, hot-work, and material-handling hazards and assigns the fall-through, hot-work, and handling controls that hold up in the field.
Why roof deck repair needs its own JHA
Roof deck repair replaces or reinforces the damaged structural roof deck — cutting out and replacing deteriorated metal, wood, concrete, or gypsum decking, welding or fastening new deck, and reinforcing the structure — typically after inspection identifies the damage and before re-roofing. The work is on a compromised deck, often involves hot work, and handles deck materials. The hazards combine the fall-through (working on and around the damaged, compromised deck that is being repaired — the deck may fail under the worker, a fall-through hazard, worsened by removing sections of deck), the hot work (welding new metal deck, or cutting out old deck — fire hazard on a roof, with combustible roofing materials and the fire spreading, and hot work over occupied space below), the material handling (handling and placing the deck materials — handling, and the deck-panel hazards), and the openings created by removing deck. The fall-through and the hot work justify a dedicated JHA.
Breaking roof deck repair into steps
The steps for a Roof Deck Repair JHA follow the repair:
- Establish fall protection and fall-through protection
- Support the work area and the compromised deck
- Remove the damaged deck sections
- Protect the openings created by deck removal
- Install and weld/fasten the new deck (hot work)
- Manage hot-work fire hazards
- Handle the deck materials
- Verify the repair
Each step carries a hazard, and the fall-through, the hot work, and the material handling are where the most serious risks concentrate.
The hazards step by step
Fall-through the compromised deck
Working on and around the damaged, compromised deck being repaired is a fall-through hazard — the deck may fail under the worker, and removing sections of deck creates openings and reduces support. The controls are fall protection with fall-through protection (personal fall arrest tied to independent, sound anchorage, not the compromised deck), not relying on the damaged deck, supporting the work area, protecting openings created by deck removal immediately, distributing weight or using supported work platforms over compromised deck, and the fall-through controls. The fall-through the compromised deck being repaired is the defining hazard. (These follow the roof-deck-inspection and roof-opening-protection fundamentals.)
Hot work
Welding new metal deck or cutting out old deck is hot work on a roof — a fire hazard, with the combustible roofing materials (insulation, membrane, felts) that can ignite and the fire spreading in the roofing, and hot work over occupied or combustible space below (sparks and heat travel through deck openings). The controls are hot-work controls (permit, fire watch, fire extinguishers, clearing combustibles from the work area), protecting against sparks and heat traveling below (through deck openings to the space below — managing the below-deck fire hazard), fire watch during and after the hot work, and the hot-work fire-prevention controls. Hot work on a roof with combustible materials and occupied space below is a serious fire hazard. (These follow the hot-work/welding fundamentals.)
Material handling
Handling and placing the deck materials (metal deck panels, wood, concrete) carries handling, struck-by, cut, and the deck-panel hazards (metal deck panels are sharp and can catch wind). The controls are safe handling of the deck materials, cut-resistant gloves for sharp deck panels, managing panels in wind, team handling, and the material-handling controls. (These follow the material-handling fundamentals.)
Openings from deck removal
Removing deck sections creates openings — fall-through-opening hazards. The controls are protecting the openings created by deck removal immediately (covers, guardrails), and the roof-opening-protection controls. (These follow the roof-opening-protection fundamentals.)
A simple Roof Deck Repair JHA structure
| Step | Hazard | Control | Standard |
|---|---|---|---|
| Establish protection | Fall-through | Fall arrest to sound anchorage (not deck), fall-through protection | OSHA 1926.501(b)(4) |
| Remove damaged deck | Fall-through / opening | Support work area, protect openings created immediately | OSHA 1926.502 |
| Weld/install deck | Hot-work fire | Hot-work permit, fire watch, clear combustibles, manage below-deck | OSHA 1926.352 |
| Manage below-deck fire | Fire spread below | Protect against sparks/heat traveling below through openings | OSHA 1926.352 |
| Handle deck materials | Cut / struck-by / wind | Safe handling, cut-resistant gloves, manage panels in wind | OSHA 1926.250 |
| Protect openings | Fall through opening | Cover/guard openings from deck removal | OSHA 1926.502 |
Fall-through protection and hot-work fire control
A Roof Deck Repair JHA centers on fall-through protection and hot-work fire control. The fall-through protection addresses working on the compromised deck being repaired — the deck may fail, and removing sections creates openings — controlled by fall protection tied to independent sound anchorage (not the compromised deck), supporting the work area, and protecting openings immediately. The hot-work fire control addresses welding and cutting deck on a roof — with combustible roofing materials and occupied space below — controlled by hot-work permits, fire watch, clearing combustibles, and managing the below-deck fire hazard (sparks and heat traveling through openings). A JHA built on fall-through protection and hot-work fire control, with material-handling and opening-protection controls, addresses the hazards that define roof deck repair.
From the field: what actually goes wrong
In fourteen years across federal, heavy civil, and industrial projects, roof deck repair combines the fall-through hazard of working on compromised deck with the fire hazard of hot work on a roof. The fall-through is the first: the whole point of the repair is that the deck is damaged, so the crew is working on and around a compromised deck that may fail under them, and removing damaged deck sections creates openings and reduces support. The controls are fall protection with fall-through protection — personal fall arrest tied to independent, sound anchorage, not the compromised deck — not relying on the damaged deck, supporting the work area, and immediately protecting the openings created by deck removal.
The hot work is the other defining hazard, and the roof setting makes it particularly serious. Welding new metal deck or cutting out old deck is hot work surrounded by combustible roofing materials — insulation, membrane, felts — that can ignite and spread fire in the roofing, and, critically, the hot work is often over occupied or combustible space below, with sparks and heat able to travel through deck openings to that space. On the projects I have run, the controls are hot-work permits, fire watch during and after the work, fire extinguishers, clearing combustibles from the work area, and specifically managing the below-deck fire hazard by protecting against sparks and heat traveling below through openings. The deck-material handling (sharp metal panels that catch wind) and the openings from deck removal round out the hazards. The JHA built on fall-through protection and hot-work fire control is the one that protects the deck-repair crew.
The bottom line
A Roof Deck Repair JHA names the fall-through, the hot-work, and the material-handling hazards with specific controls — fall protection tied to independent sound anchorage on the compromised deck with immediate opening protection, hot-work permits and fire watch with management of the below-deck fire hazard, and safe handling of the sharp deck materials. The fall-through and the hot-work fire are the defining hazards. The JHA that manages both is the one that protects the crew.
Frequently asked questions
Why is fall-through a hazard in deck repair?
The repair is on a compromised deck (that is why it is being repaired), so the crew works on and around a damaged deck that may fail under them, and removing damaged deck sections creates openings and reduces support. Controls are fall protection with fall-through protection tied to independent sound anchorage (not the compromised deck), not relying on the damaged deck, supporting the work area, protecting openings created by deck removal immediately, and distributing weight or using supported platforms.
Why is hot work on a roof deck a serious fire hazard?
Welding new metal deck or cutting old deck is hot work surrounded by combustible roofing materials (insulation, membrane, felts) that can ignite and spread fire, and the hot work is often over occupied or combustible space below, with sparks and heat able to travel through deck openings. Controls are hot-work permits, fire watch during and after, fire extinguishers, clearing combustibles, and managing the below-deck fire hazard by protecting against sparks and heat traveling below.
What is the below-deck fire hazard?
When hot work is done on a roof deck, sparks, slag, and heat can travel through deck openings, gaps, or the deck itself to the space below — which may be occupied or contain combustibles — starting a fire below that the roof crew cannot see. Controls are protecting against sparks and heat traveling below (covering openings, a fire watch below where needed), and managing the below-deck fire hazard as part of the hot-work controls.
What are the deck-material handling hazards?
Handling and placing the deck materials (metal deck panels, wood, concrete) carries handling, struck-by, cut, and wind hazards — metal deck panels are sharp and can catch wind. Controls are safe handling of the deck materials, cut-resistant gloves for sharp panels, managing panels in wind, team handling, and the material-handling controls.
Related JHAs
- Roof Deck Inspection JHA — the inspection identifying the repair
- Roof Opening Protection JHA — protecting openings from deck removal
- Roof Tear-Off JHA — the tear-off exposing the deck
- Roof Work JHA — the general 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.