Abrasive Blasting of Masonry AHA (Activity Hazard Analysis / Job Hazard Analysis)
Updated 2026-06-23
A Abrasive Blasting of Masonry AHA (Activity Hazard Analysis / Job Hazard Analysis) is the plan that keeps the crew abrasive blasting masonry safe from the respirable silica of blasting, from the blast media and high-pressure stream, and around the containment, ventilation, and access. Abrasive blasting of masonry cleans or removes coatings from masonry with an abrasive stream — combining the respirable-silica from-blasting hazard, the blast- media and high-pressure-stream hazard, and the containment, ventilation, and access hazard. This guide walks through building a Abrasive Blasting of Masonry AHA that names the respirable-silica, blast-media/high-pressure- stream, and containment-ventilation/access hazards and assigns the silica, blast, and containment controls that hold up in the field.
Why abrasive blasting of masonry needs its own AHA
Abrasive blasting of masonry is the cleaning, restoration, or coating removal of masonry surfaces using a high-pressure abrasive stream — propelling abrasive media (sand historically, or other media) at the masonry to strip paint, coatings, dirt, or deteriorated surface. The defining feature is the extreme dust and silica hazard: abrasive blasting of masonry generates enormous quantities of respirable dust and silica (from both the masonry being blasted and, if silica sand is used, the blast media itself), making it one of the highest-silica activities of all, along with the high-pressure abrasive stream (a severe injury hazard) and the need for containment and ventilation. The hazards combine the respirable-silica from-blasting (blasting masonry generates enormous respirable dust and silica — the silica hazard (blasting pulverizes the masonry surface and, if silica sand media is used, the media too — extreme respirable silica, one of the very highest-silica activities; silica sand blasting media is essentially prohibited/to be substituted for this reason)), the blast-media and high- pressure-stream (the high-pressure abrasive stream — the stream-injury hazard (the abrasive stream can severely injure — never at a person) and the equipment (the pressurized blast pot, hoses))), the containment, ventilation, and access (the containment (to control the dust/debris), ventilation, and the access (blasting facades at height)), and the noise/media-debris. The respirable-silica and the blast-media/high-pressure-stream justify a dedicated AHA.
Breaking abrasive blasting of masonry into steps
The steps for a Abrasive Blasting of Masonry AHA follow the blasting:
- Select non-silica blast media (substitute for silica sand)
- Set up containment and ventilation
- Set up the blast equipment (pot, hoses, nozzle)
- Set up respiratory protection (supplied-air/blasting hood)
- Blast the masonry (never at a person, controlled stream)
- Manage the silica/dust, stream, and containment hazards
- Clean up the media/debris
- Complete
Each step carries a hazard, and the respirable-silica, the blast-media/high-pressure-stream, and the containment- ventilation/access are where the most significant risks concentrate.
The hazards step by step
Respirable-silica from-blasting
Blasting masonry generates enormous respirable dust and silica — the silica hazard (blasting pulverizes the masonry surface and, if silica sand media is used, the media too — extreme respirable silica, one of the very highest-silica activities; silica sand blasting media is essentially prohibited/to be substituted for this reason). The controls are substituting non-silica blast media for silica sand (silica sand as blasting media creates extreme respirable silica and is essentially prohibited/to be substituted — use non-silica media), and comprehensive respiratory protection (abrasive blasting requires the highest level of respiratory protection — a supplied-air (type CE) blasting respirator/hood, because even with non-silica media the blasted masonry generates extreme respirable dust/silica), per the silica standard, which classifies abrasive blasting at the highest protection level, and the silica controls. The respirable-silica is the primary defining hazard — abrasive blasting is one of the very highest-silica activities. (These follow the silica and abrasive-blasting fundamentals.)
Blast-media and high-pressure-stream
The high-pressure abrasive stream — the stream-injury hazard (the abrasive stream can severely injure — never at a person) and the equipment (the pressurized blast pot, hoses). The controls are never directing the blast stream at any person (the high-pressure abrasive stream causes severe injury), safe blast-equipment operation (the pressurized blast pot and hoses — dead-man control on the nozzle so the blast stops if released, secured hose connections, relieving pressure), exclusion zones, and the stream/equipment controls. The blast-media/high- pressure-stream is a defining hazard — the high-pressure abrasive stream causes severe injury. (These follow the high-pressure-blasting fundamentals.)
Containment, ventilation, and access
The containment (to control the dust/debris), ventilation, and the access (blasting facades at height). The controls are containment of the blasting (containing the dust and debris — protecting others and the environment, per the dust-containment requirements), ventilation (managing the dust within containment), safe access for blasting at height (scaffolds/lifts, fall protection), and the containment/access controls. The containment- ventilation/access is a defining hazard — the blasting dust must be contained and the work is often at height. (These follow the dust-containment fundamentals.)
Noise/media-debris
The noise and media-debris (the loud blasting, the spent media and debris) carries the noise/debris hazard. The controls are hearing protection, managing the spent media/debris, and the noise/debris controls. (These follow the noise fundamentals.)
A simple Abrasive Blasting of Masonry AHA structure
| Step | Hazard | Control | Standard |
|---|---|---|---|
| Select media | Silica | Select non-silica blast media (substitute for sand) | OSHA 1926.1153 |
| Containment | Dust release | Set up containment and ventilation | project |
| Set up equipment | Stream | Set up the blast equipment (pot, hoses, nozzle) | project |
| Respiratory | Silica | Set up supplied-air blasting respirator/hood | OSHA 1926.1153 |
| Blast | Stream injury | Blast the masonry (never at a person, controlled) | project |
| Clean up | Debris | Clean up the media/debris | project |
Silica/respiratory control and blast-stream/containment safety
A Abrasive Blasting of Masonry AHA centers on silica/respiratory control and blast-stream/containment safety. The silica/respiratory control addresses the extreme respirable silica — controlled by substituting non-silica blast media for silica sand and comprehensive respiratory protection (a supplied-air blasting respirator/hood, the highest protection level, since abrasive blasting generates extreme respirable dust/silica). The blast-stream/ containment safety addresses the high-pressure stream and the dust — controlled by never directing the blast stream at any person, safe blast-equipment operation (dead-man control, secured hoses), and containment of the blasting dust/debris. And the ventilation, access, and noise get ventilation, access, and noise controls. An AHA built on silica/respiratory control and blast-stream/containment safety, with access controls, addresses the hazards that define abrasive blasting of masonry.
From the field: what actually goes wrong
In fourteen years across federal, heavy civil, and industrial projects, abrasive blasting of masonry cleans or strips masonry with a high-pressure abrasive stream, and it is, by a wide margin, one of the very highest-silica and highest-dust activities in all of construction — its defining hazard is respirable silica at extreme levels. The respirable-silica from-blasting hazard is the primary defining concern — abrasive blasting pulverizes the masonry surface into fine dust, generating enormous quantities of respirable dust, and if silica sand is used as the blasting media, the media itself shatters into respirable silica, compounding the exposure to extreme levels; for this reason, silica sand as an abrasive blasting media is essentially prohibited and must be substituted with non-silica media, and even then, blasting masonry generates extreme respirable dust and silica from the masonry itself. So the controls are substituting non-silica blast media for silica sand, and — critically — the highest level of respiratory protection: abrasive blasting requires a supplied-air (type CE) blasting respirator or hood, not a filtering respirator, because the dust levels are so extreme, and the OSHA silica standard classifies abrasive blasting at its highest protection tier. Abrasive blasting is the extreme case of the silica hazard, and supplied-air respiratory protection plus non-silica media are non-negotiable.
The blast-media/high-pressure-stream and the containment-ventilation/access are the other defining hazards. On the projects I have run, the high-pressure abrasive stream is itself a severe injury hazard — the stream can cut and severely injure flesh, so it must never be directed at any person, and safe blast-equipment operation (a dead-man control on the nozzle so the blast stops if the operator releases it, secured hose connections, and relieving the pressurized blast pot) plus exclusion zones are the controls. And the containment-ventilation/access hazard is that the enormous dust and debris must be contained (to protect other workers and the environment, per the dust-containment requirements), managed with ventilation, and the work is often on facades at height (safe scaffold/lift access and fall protection). The containment keeps the extreme dust from spreading. The noise and spent-media debris round it out. The AHA built on silica/respiratory control and blast-stream/containment safety is the one that protects the blasting crew.
The bottom line
A Abrasive Blasting of Masonry AHA names the respirable-silica, the blast-media/high-pressure-stream, and the containment-ventilation/access hazards with specific controls — substituting non-silica blast media for silica sand and using supplied-air blasting respiratory protection (abrasive blasting is one of the very highest-silica activities), never directing the high-pressure stream at people with a dead-man control, and containing the extreme blasting dust. The silica/respiratory control and the blast-stream/containment safety are the defining concerns. The AHA that manages both is the one that protects the crew.
Frequently asked questions
Why is abrasive blasting such an extreme silica hazard?
Abrasive blasting pulverizes the masonry surface into fine dust, generating enormous quantities of respirable dust, and if silica sand is used as the blasting media, the media itself shatters into respirable silica, compounding the exposure to extreme levels — making it one of the very highest-silica activities. Controls are substituting non-silica blast media for silica sand (silica sand media is essentially prohibited/to be substituted), comprehensive respiratory protection (a supplied-air/type CE blasting respirator/hood, the highest protection level, since even non-silica media generates extreme dust from the masonry), per the silica standard's highest tier, and the silica controls.
Why is the blast stream a severe hazard?
The high-pressure abrasive stream can cut and severely injure flesh. Controls are never directing the blast stream at any person, safe blast-equipment operation (dead-man control on the nozzle so the blast stops if released, secured hose connections, relieving the pressurized blast pot), exclusion zones, and the stream/equipment controls.
What containment and access hazards apply?
The enormous dust and debris must be contained (to protect other workers and the environment), managed with ventilation, and the work is often on facades at height. Controls are containment of the blasting (containing the dust and debris per the dust-containment requirements), ventilation (managing the dust within containment), safe access for blasting at height (scaffolds/lifts, fall protection), and the containment/access controls.
What is abrasive blasting of masonry?
Abrasive blasting of masonry is the cleaning, restoration, or coating removal of masonry surfaces using a high-pressure abrasive stream — propelling abrasive media at the masonry to strip paint, coatings, dirt, or deteriorated surface. Because it generates extreme respirable silica (one of the highest-silica activities), the high-pressure stream causes severe injury, and the dust must be contained (often at height), those hazards apply.
Related AHAs and JHAs
- Maintenance of Unit Masonry AHA — the related masonry maintenance
- Common Work Results for Masonry AHA — the masonry work fundamentals
- Sandblasting Operations JHA — the abrasive-blasting fundamentals
- Temporary Dust Containment Installation JHA — the dust-containment 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.