Built-Up Asphalt Roofing AHA (Activity Hazard Analysis / Job Hazard Analysis)
Updated 2026-06-23
A Built-Up Asphalt Roofing AHA (Activity Hazard Analysis / Job Hazard Analysis) is the plan that keeps the crew installing built-up asphalt roofing safe from the hot asphalt burn and fumes, from the kettle and hot material handling, and around the low-slope roof fall and fire. Built-up asphalt roofing builds up a hot-applied asphalt roof membrane — combining the hot-asphalt-burn and fumes hazard, the kettle and hot-material-handling hazard, and the low-slope-roof-fall and fire hazard. This guide walks through building a Built-Up Asphalt Roofing AHA that names the hot-asphalt-burn/fumes, kettle/hot-material-handling, and low-slope-roof-fall/fire hazards and assigns the burn, hot-material, and fall/fire controls that hold up in the field.
Why built-up asphalt roofing needs its own AHA#
Built-up asphalt roofing is the construction of a built-up asphalt roof membrane — the built-up roof (BUR) membrane built up from multiple plies of roofing felts mopped together with hot asphalt on a low-slope roof (the asphalt- specific version of built-up bituminous roofing). This continues the built-up roofing pair. The defining feature is the same as built-up bituminous roofing — hot asphalt on the roof (the BUR membrane built up by mopping molten hot asphalt between felt plies) — so the primary hazards are the hot-asphalt burns and fumes, the kettle/hot-material handling, and the low-slope roof fall and fire. The hazards combine the hot-asphalt-burn and fumes (mopping the molten hot asphalt — the burn hazard (severe burns) and the fume hazard (asphalt fumes)), the kettle and hot- material-handling (heating, hoisting, and handling the hot asphalt — the kettle-operation and hot-material hazards), the low-slope-roof-fall and fire (working on the roof with hot asphalt — the fall and fire hazards), and the eye/slip. The hot-asphalt-burn/fumes and the kettle/hot-material-handling justify a dedicated AHA.
Breaking built-up asphalt roofing into steps#
The steps for a Built-Up Asphalt Roofing AHA follow the work:
- Set up the kettle and hot-asphalt operation safely
- Set up roof-edge fall protection and fire protection
- Hoist the hot asphalt to the roof (hot-material handling)
- Mop the hot asphalt and lay the felt plies (burn)
- Build up the membrane plies
- Manage the burn, fall, and fire hazards
- Complete the surfacing
- Complete
Each step carries a hazard, and the hot-asphalt-burn/fumes, the kettle/hot-material-handling, and the low-slope- roof-fall/fire are where the most significant risks concentrate.
The hazards step by step#
Hot-asphalt-burn and fumes
Mopping the molten hot asphalt — the burn hazard (severe burns) and the fume hazard (asphalt fumes). The controls are hot-asphalt burn and fume controls (the BUR membrane is built up by mopping molten hot asphalt (heated to high temperature) between the felt plies — a severe burn hazard from hot asphalt splashing, dripping, or contacting skin, so burn-protection PPE (heat-resistant gloves, sleeves, long clothing, boots, face protection), careful mopping to avoid splashing, and asphalt-fume control (ventilation/positioning and respiratory protection where needed)), and the burn/fume controls. The hot-asphalt-burn/fumes is the primary defining hazard — hot asphalt causes severe burns and releases fumes. (These follow the hot-asphalt fundamentals.)
Kettle and hot-material-handling
Heating, hoisting, and handling the hot asphalt — the kettle-operation and hot-material hazards. The controls are kettle and hot-material controls (the asphalt is heated in a kettle — safe kettle operation (not overheating, watching the flash point, fire extinguisher at the kettle), the critical rule of keeping water away from the hot asphalt (water causes violent boilover/splattering), and hoisting/pumping the hot asphalt to and across the roof (controlled to avoid spills and burns)), and the kettle/hot-material controls. The kettle/hot-material-handling is a defining hazard — kettle operation and getting hot asphalt to the roof are burn/fire hazards. (These follow the kettle-operation fundamentals.)
Low-slope-roof-fall and fire
Working on the roof with hot asphalt — the fall and fire hazards. The controls are roof-fall and fire controls (the work is on an open low-slope roof at height — fall protection at the roof edge and opening protection, and doing hot work with hot asphalt on the roof is a fire hazard — fire protection (extinguishers, fire watch, clearing combustibles, keeping hot asphalt away from combustibles)), and the fall/fire controls. The low-slope-roof-fall/ fire is a defining hazard — hot-asphalt roofing is open-roof work with a fire hazard. (These follow the roof-fall and hot-work fundamentals.)
Eye/slip
The eye and slip (hot-asphalt splash, slippery surfaces) carries the eye/slip hazard. The controls are eye/face protection (hot-asphalt splash) and slip awareness, and the eye/slip controls. (These follow the eye-protection fundamentals.)
A simple Built-Up Asphalt Roofing AHA structure#
| Step | Hazard | Control | Standard |
|---|---|---|---|
| Kettle setup | Burn / fire | Set up the kettle and hot-asphalt operation safely | project |
| Fall/fire | Fall / fire | Set up roof-edge fall protection and fire protection | OSHA 1926.501 |
| Hoist asphalt | Burn | Hoist the hot asphalt to the roof (hot-material handling) | project |
| Mop | Burn / fume | Mop the hot asphalt and lay the felt plies (burn) | project |
| Build up | Burn | Build up the membrane plies | project |
| Surface | Burn | Complete the surfacing | project |
Hot-asphalt burn/fume control and roof-fall/fire safety#
A Built-Up Asphalt Roofing AHA centers on hot-asphalt burn/fume control and roof-fall/fire safety. The hot-asphalt burn/fume control addresses the molten asphalt — controlled by hot-asphalt burn and fume controls (burn-protection PPE, careful mopping, fume control) and kettle/hot-material controls (safe kettle operation, keeping water away from hot asphalt, controlled hoisting). The roof-fall/fire safety addresses the open-roof work and fire hazard — controlled by roof-fall and fire controls (roof-edge protection, fire protection). And the eye and slip get eye/ slip controls. An AHA built on hot-asphalt burn/fume control and roof-fall/fire safety, with eye/slip controls, addresses the hazards that define built-up asphalt roofing.
From the field: what actually goes wrong#
In fourteen years across federal, heavy civil, and industrial projects, built-up asphalt roofing builds up a multi-ply BUR membrane by mopping hot asphalt between roofing felts on a low-slope roof, and its hazards are essentially identical to built-up bituminous roofing, centered on the hot asphalt. The hot-asphalt-burn and fumes hazard is the primary defining concern — the BUR membrane is built up by mopping molten hot asphalt (heated to high temperature in a kettle) between the felt plies, and the hot asphalt is a severe burn hazard (splashing, dripping, or contacting skin causes serious burns), so burn-protection PPE (heat-resistant gloves, sleeves, long clothing, boots, face protection), careful mopping to avoid splashing, and asphalt-fume control (ventilation/positioning and respiratory protection where needed) are the central controls. The hot asphalt's burns and fumes are the defining hazard.
The kettle/hot-material-handling and the low-slope-roof-fall/fire are the other defining hazards. On the projects I have run, the asphalt is heated in a kettle, and safe kettle operation is essential — not overheating (watching the flash point, fire extinguisher at the kettle) and the critical rule of keeping water away from hot asphalt (water causes a violent boilover) — plus hoisting or pumping the hot asphalt up to and across the roof (a burn hazard the whole way). And the low-slope-roof-fall/fire hazard is that the work is on an open low-slope roof at height (fall protection at the roof edge and opening protection) and doing hot work with hot asphalt on the roof is a fire hazard (fire protection — extinguishers, fire watch, clearing combustibles). The eye and slip round it out. The AHA built on hot-asphalt burn/fume control and roof-fall/fire safety is the one that protects the built-up- asphalt-roofing crew.
The bottom line#
A Built-Up Asphalt Roofing AHA names the hot-asphalt-burn/fumes, the kettle/hot-material-handling, and the low- slope-roof-fall/fire hazards with specific controls — hot-asphalt burn and fume controls (burn PPE, careful mopping, fume control), kettle and hot-material controls (safe kettle operation, keeping water away from hot asphalt, controlled hoisting to the roof), and roof-fall and fire controls (roof-edge protection, fire protection). The hot-asphalt burn/fume control and the roof-fall/fire safety are the defining concerns. The AHA that manages both is the one that protects the crew.
Frequently asked questions#
Why is hot asphalt the defining hazard?
The BUR membrane is built up by mopping molten hot asphalt (heated to high temperature in a kettle) between the felt plies, and the hot asphalt is a severe burn hazard (splashing, dripping, or contacting skin causes serious burns) and releases fumes. Controls are hot-asphalt burn and fume controls (burn-protection PPE — heat-resistant gloves, sleeves, long clothing, boots, face protection; careful mopping to avoid splashing; asphalt-fume control with ventilation/positioning and respiratory protection where needed), and the burn/fume controls.
What kettle and hot-material hazards apply?
The asphalt is heated in a kettle, with the hazards of overheating (watching the flash point) and, critically, keeping water away from hot asphalt (water causes violent boilover), plus hoisting/pumping the hot asphalt up to and across the roof. Controls are kettle and hot-material controls (safe kettle operation, fire extinguisher at the kettle, keeping water away, controlled hoisting/pumping to the roof), and the kettle/hot-material controls.
What fall and fire hazards apply?
The work is on an open low-slope roof at height (fall at the roof edge and openings), and doing hot work with hot asphalt on the roof is a fire hazard. Controls are roof-fall and fire controls (fall protection at the roof edge and opening protection; fire protection — extinguishers, fire watch, clearing combustibles), and the fall/fire controls.
What is built-up asphalt roofing?
Built-up asphalt roofing is the construction of a built-up asphalt roof membrane — the built-up roof (BUR) membrane built up from multiple plies of roofing felts mopped together with hot asphalt on a low-slope roof. Because the hot asphalt causes severe burns and fumes, the kettle operation and getting hot asphalt to the roof are burn/fire hazards, and the open-roof hot work is a fall and fire hazard, those hazards apply.
Related AHAs and JHAs#
- Built-Up Bituminous Roofing AHA — the built-up bituminous version
- Modified Bituminous Roofing AHA — the related modified-bitumen roofing
- Membrane Roofing AHA — the membrane-roofing fundamentals
- Hot Work JHA — the hot-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.