Preparation for Re-Roofing AHA (Activity Hazard Analysis / Job Hazard Analysis)
Updated 2026-06-23
A Preparation for Re-Roofing AHA (Activity Hazard Analysis / Job Hazard Analysis) is the plan that keeps the crew preparing for re-roofing safe from the roof fall and weakened deck, from the tear-off debris and hazardous materials, and around the material handling and weather. Preparation for re-roofing tears off and prepares the existing roof for re-roofing — combining the roof-fall and weakened-deck hazard, the tear-off-debris and hazardous-materials hazard, and the material-handling and weather hazard. This guide walks through building a Preparation for Re-Roofing AHA that names the roof-fall/weakened-deck, tear-off-debris/hazardous-materials, and material-handling/weather hazards and assigns the fall-protection, debris/hazmat, and handling controls that hold up in the field.
Why preparation for re-roofing needs its own AHA
Preparation for re-roofing is the work of preparing an existing roof for re-roofing — tearing off the old roofing, inspecting and preparing the deck, and getting the roof ready for the new roofing system. This opens Division 07 (Thermal and Moisture Protection). The defining feature is the roof-work fall hazard combined with the specific hazards of working on an existing (possibly deteriorated) roof: the fall hazard is severe (roof-edge falls, and the specific danger of a weakened/deteriorated deck that can give way — a fall-through hazard), the tear-off generates debris and may expose hazardous materials (old roofing may contain asbestos, and there is heavy debris), and material handling and weather. The hazards combine the roof-fall and weakened-deck (working on the roof — the fall hazard (roof-edge falls) and the weakened-deck hazard (an existing/deteriorated roof deck can be weakened — a fall-through hazard)), the tear-off-debris and hazardous-materials (tearing off the old roofing — the debris hazard and the hazardous-materials hazard (old roofing may contain asbestos or other hazardous materials)), the material-handling and weather (handling the debris/materials and the weather exposure — the handling and weather hazards), and the trip/housekeeping. The roof-fall/weakened-deck and the tear-off-debris/hazardous-materials justify a dedicated AHA.
Breaking preparation for re-roofing into steps
The steps for a Preparation for Re-Roofing AHA follow the work:
- Assess the roof and any hazardous materials (asbestos survey)
- Set up roof access and fall protection
- Establish debris-handling and drop zones
- Tear off the existing roofing (debris)
- Inspect and prepare the deck (weakened-deck check)
- Manage the fall, debris, and hazmat hazards
- Protect the opened roof from weather
- Complete
Each step carries a hazard, and the roof-fall/weakened-deck, the tear-off-debris/hazardous-materials, and the material-handling/weather are where the most significant risks concentrate.
The hazards step by step
Roof-fall and weakened-deck
Working on the roof — the fall hazard (roof-edge falls) and the weakened-deck hazard (an existing/deteriorated roof deck can be weakened — a fall-through hazard). The controls are roof fall protection (working on the roof — fall protection for roof-edge falls (guardrails, personal fall arrest, warning lines/monitors per the roofing fall-protection provisions), and roof-opening/skylight protection), weakened-deck protection (an existing roof deck, especially a deteriorated one, can be weakened by rot, corrosion, or damage — a fall-through hazard, so assessing the deck condition, watching for soft/weakened areas, and not walking on questionable deck), and the fall/deck controls. The roof-fall/weakened-deck is the primary defining hazard — roof falls and fall-through of a weakened deck. (These follow the roof-work fall-protection fundamentals.)
Tear-off-debris and hazardous-materials
Tearing off the old roofing — the debris hazard and the hazardous-materials hazard (old roofing may contain asbestos or other hazardous materials). The controls are safe tear-off and debris handling (tearing off the old roofing generates heavy debris — controlled removal, debris chutes/containers, drop zones below, and not overloading the roof with debris), hazardous-materials assessment (old roofing materials may contain asbestos (older built-up roofing, flashing, and mastics) or other hazardous materials, so a hazardous-materials/asbestos survey before disturbing the roofing, and if asbestos is present, the abatement is handled by the appropriate qualified/licensed process, not disturbed by the re-roofing crew), and the debris/hazmat controls. The tear-off- debris/hazardous-materials is a defining hazard — tear-off generates debris and may expose asbestos. (These follow the demolition-debris and hazmat fundamentals.)
Material-handling and weather
Handling the debris/materials and the weather exposure — the handling and weather hazards. The controls are safe material handling (handling the tear-off debris and new materials — manual handling, mechanical loading/lowering), weather management (roof work is weather-exposed — heat, wind, wet/slippery surfaces — and the opened roof must be protected from weather), and the handling/weather controls. The material-handling/weather is a defining hazard. (These follow the material-handling and weather fundamentals.)
Trip/housekeeping
The trip and housekeeping (debris and materials on the roof) carries the trip hazard. The controls are roof housekeeping (keeping the work area clear of debris and trip hazards), and the housekeeping controls. (These follow the housekeeping fundamentals.)
A simple Preparation for Re-Roofing AHA structure
| Step | Hazard | Control | Standard |
|---|---|---|---|
| Assess | Asbestos | Assess the roof and any hazardous materials (asbestos survey) | OSHA 1926.1101 |
| Access/fall | Fall | Set up roof access and fall protection | OSHA 1926.501 |
| Debris zones | Struck-by | Establish debris-handling and drop zones | project |
| Tear off | Debris / asbestos | Tear off the existing roofing (debris) | OSHA 1926.501 |
| Inspect deck | Fall-through | Inspect and prepare the deck (weakened-deck check) | project |
| Protect | Weather | Protect the opened roof from weather | project |
Roof fall protection and debris/hazmat control
A Preparation for Re-Roofing AHA centers on roof fall protection and debris/hazmat control. The roof fall protection addresses the roof falls and weakened deck — controlled by roof fall protection (roof-edge fall protection, opening/skylight protection) and weakened-deck protection (assessing the deck, avoiding fall-through of deteriorated deck). The debris/hazmat control addresses the tear-off — controlled by safe tear-off and debris handling and hazardous-materials assessment (asbestos survey, qualified abatement if present). And the material handling, weather, and housekeeping get handling and housekeeping controls. An AHA built on roof fall protection and debris/hazmat control, with handling controls, addresses the hazards that define preparation for re-roofing.
From the field: what actually goes wrong
In fourteen years across federal, heavy civil, and industrial projects, preparation for re-roofing tears off the old roofing and prepares the deck for the new roofing system, and it opens Division 07. Its defining hazards are the roof-work fall hazard, intensified by the condition of an existing roof, and the tear-off debris and possible hazardous materials. The roof-fall and weakened-deck hazard is a primary defining concern — working on the roof has the roof-edge fall hazard (fall protection — guardrails, personal fall arrest, warning lines/monitors per the roofing fall-protection provisions, and roof-opening and skylight protection), and re-roofing prep adds a specific danger: the existing roof deck, especially on an older or deteriorated building, can be weakened by rot, corrosion, or damage, creating a fall-through hazard (a worker can step onto a weakened area of deck that gives way), so assessing the deck condition, watching for soft or weakened areas, and not walking on questionable deck matter. The roof-edge fall and the fall-through of a weakened deck are the defining fall concerns.
The tear-off-debris/hazardous-materials and the material-handling/weather are the other defining hazards, and the hazardous materials is a critical re-roofing-specific concern. On the projects I have run, tearing off the old roofing generates heavy debris (controlled removal, debris chutes and containers, drop zones below to protect people, and not overloading the roof with piled debris), and — importantly — old roofing materials may contain asbestos (older built-up roofing, flashing, and mastics were sometimes made with asbestos), so a hazardous- materials/asbestos survey before disturbing the roofing is essential, and if asbestos is present, the abatement must be handled by the appropriate qualified/licensed abatement process, not simply torn off by the re-roofing crew (disturbing asbestos-containing roofing releases asbestos fibers). And the material-handling/weather hazard is handling the debris and materials (manual handling, mechanical loading/lowering) and the weather (roof work is weather-exposed — heat, wind, wet/slippery surfaces — and the opened roof must be protected from weather). The housekeeping rounds it out. The AHA built on roof fall protection and debris/hazmat control is the one that protects the re-roofing-prep crew.
The bottom line
A Preparation for Re-Roofing AHA names the roof-fall/weakened-deck, the tear-off-debris/hazardous-materials, and the material-handling/weather hazards with specific controls — roof fall protection (roof-edge and opening protection) with weakened-deck protection (assessing the deck, avoiding fall-through), safe tear-off and debris handling with hazardous-materials assessment (asbestos survey, qualified abatement if present), and safe material handling with weather management. The roof fall protection and the debris/hazmat control are the defining concerns. The AHA that manages both is the one that protects the crew.
Frequently asked questions
Why is a weakened deck a specific re-roofing hazard?
Working on the roof has the roof-edge fall hazard, and re-roofing prep adds a specific danger: the existing roof deck, especially on an older or deteriorated building, can be weakened by rot, corrosion, or damage, creating a fall-through hazard (a worker can step onto a weakened area of deck that gives way). Controls are roof fall protection (roof-edge fall protection, opening/skylight protection), weakened-deck protection (assessing the deck condition, watching for soft/weakened areas, not walking on questionable deck), and the fall/deck controls.
Why is hazardous-materials assessment critical for re-roofing?
Old roofing materials may contain asbestos (older built-up roofing, flashing, and mastics were sometimes made with asbestos), so disturbing them can release asbestos fibers. Controls are hazardous-materials assessment (a hazardous-materials/asbestos survey before disturbing the roofing, and if asbestos is present, handling the abatement by the appropriate qualified/licensed process rather than tearing it off with the re-roofing crew), safe tear-off and debris handling, and the debris/hazmat controls.
What handling and weather hazards apply?
Tearing off generates heavy debris to handle, and roof work is weather-exposed (heat, wind, wet/slippery surfaces), with the opened roof needing weather protection. Controls are safe material handling (manual handling, mechanical loading/lowering, debris chutes/containers, drop zones), weather management (heat, wind, wet surfaces, protecting the opened roof), and the handling/weather controls.
What is preparation for re-roofing?
Preparation for re-roofing is the work of preparing an existing roof for re-roofing — tearing off the old roofing, inspecting and preparing the deck, and getting the roof ready for the new roofing system. Because roof work has a severe fall hazard (worsened by a weakened deck), tear-off generates debris and may expose asbestos, and there is material handling and weather exposure, those hazards apply.
Related AHAs and JHAs
- Dampproofing and Waterproofing AHA — the related moisture-protection work
- Roof Tear-Off JHA — the roof-tear-off fundamentals
- Roof Work JHA — the roof-work fall fundamentals
- Roof Deck Inspection JHA — the deck-inspection 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.