Urethane and Epoxy Crack Injection AHA (Activity Hazard Analysis / Job Hazard Analysis)
Updated 2026-06-23
An Urethane and Epoxy Crack Injection AHA (Activity Hazard Analysis / Job Hazard Analysis) is the plan that keeps the crew performing urethane and epoxy crack injection safe from the high-pressure injection, from the urethane and epoxy chemical exposure, and around the confined and structural location. Urethane and epoxy crack injection injects resin to seal/repair cracks — combining the high-pressure-injection hazard, the urethane and epoxy-chemical- exposure hazard, and the confined and structural-location hazard. This guide walks through building an Urethane and Epoxy Crack Injection AHA that names the high-pressure-injection, urethane/epoxy-chemical-exposure, and confined/ structural-location hazards and assigns the pressure, chemical, and location controls that hold up in the field.
Why urethane and epoxy crack injection needs its own AHA
Urethane and epoxy crack injection is the injection of resin to seal or repair cracks — the crack injection (injecting urethane (polyurethane) resin to seal/waterproof cracks, or epoxy resin to structurally bond/repair cracks, in concrete and masonry, using injection ports and a pressurized injection pump/gun). This closes the joint-protection group and the batch. The defining feature is the pressurized injection: the resin is forced into the crack under pressure through injection ports (using an injection pump or gun — a high-pressure hazard, including high-pressure injection injury to the skin if the injection stream contacts a hand), combined with the urethane and epoxy chemistry (isocyanate-containing urethanes and epoxy sensitizers/hardeners — serious chemical exposures, and the exothermic reaction), at cracks that are often in structural elements and confined locations. The hazards combine the high-pressure-injection (the pressurized injection — the high-pressure hazard, including injection injury), the urethane and epoxy-chemical-exposure (the urethane and epoxy resins — the chemical exposure), the confined and structural-location (the crack locations — the confined and access hazards), and the eye. The high- pressure-injection and the urethane/epoxy-chemical-exposure justify a dedicated AHA.
Breaking urethane and epoxy crack injection into steps
The steps for an Urethane and Epoxy Crack Injection AHA follow the work:
- Review the resin system and safety data (urethane/epoxy)
- Assess the crack location (structural, confined, access)
- Set up chemical-exposure controls (ventilation, PPE)
- Set up the injection equipment and pressure safety
- Install the injection ports and seal the crack surface
- Inject the resin under pressure (high-pressure)
- Manage the pressure, chemical, and location hazards
- Complete
Each step carries a hazard, and the high-pressure-injection, the urethane/epoxy-chemical-exposure, and the confined/structural-location are where the most significant risks concentrate.
The hazards step by step
High-pressure-injection
The pressurized injection — the high-pressure hazard, including injection injury. The controls are high-pressure- injection controls (the resin is injected into the crack under pressure through injection ports using an injection pump or gun — a high-pressure hazard: the pressurized system (pump, hoses, and ports) can fail or burst (hose whip, port blowout), and the high-pressure injection stream can cause a serious high-pressure injection injury if it contacts the skin/hand (a medical emergency even from a small entry wound), so pump/hose/port pressure ratings and inspection, never placing hands over the injection point or ports under pressure, controlled pressure, safe pressure relief/bleed-down before clearing blockages, and awareness of the injection-injury hazard), and the high- pressure controls. The high-pressure-injection is the primary defining hazard — pressurized crack injection is a high-pressure and injection-injury hazard. (These follow the high-pressure fundamentals.)
Urethane and epoxy-chemical-exposure
The urethane and epoxy resins — the chemical exposure. The controls are urethane and epoxy-chemical controls (urethane (polyurethane) injection resins contain isocyanates (a respiratory sensitizer and skin/eye hazard) and can react with water energetically/foaming, and epoxy injection resins have epoxy resin and hardener/amine components (skin sensitizers/corrosives and an exothermic curing reaction — heat), so respiratory protection where needed, skin/eye protection (chemical-resistant gloves — the epoxy and urethane components are skin sensitizers), ventilation, careful mixing (the exotherm), and following the product safety data for the specific resin), and the chemical-exposure controls. The urethane/epoxy-chemical-exposure is a defining hazard — the injection resins are serious chemical exposures. (These follow the resin-chemical fundamentals.)
Confined and structural-location
The crack locations — the confined and access hazards. The controls are confined and structural-location controls (crack injection is done at cracks in concrete and masonry structural elements, often in confined locations (basements, tanks, tunnels, foundations, and below-grade structures — confined-space procedures where the space qualifies, ventilation in enclosed areas — critical given the resin chemistry, and safe access), and at height on structures where the crack is elevated (fall protection)), and the location controls. The confined/structural- location is a defining hazard — cracks are often in confined and structural locations. (These follow the confined- space fundamentals.)
Eye
The eye (resin, injection, high-pressure) carries the eye hazard. The controls are eye protection (resin splash and the high-pressure injection — full eye/face protection given the pressure and resin chemistry), and the eye controls. (These follow the eye-protection fundamentals.)
A simple Urethane and Epoxy Crack Injection AHA structure
| Step | Hazard | Control | Standard |
|---|---|---|---|
| Review resin | Chemical | Review the resin system and safety data (urethane/epoxy) | OSHA 1926.59 |
| Assess crack | Confined | Assess the crack location (structural, confined, access) | OSHA 1926.1200 |
| Chemical controls | Vapor / skin | Set up chemical-exposure controls (ventilation, PPE) | OSHA 1926.59 |
| Equipment/pressure | High pressure | Set up the injection equipment and pressure safety | OSHA 1926.302 |
| Install ports | Chemical | Install the injection ports and seal the crack surface | project |
| Inject | High pressure | Inject the resin under pressure (high-pressure) | project |
High-pressure-injection control and urethane/epoxy-chemical control
An Urethane and Epoxy Crack Injection AHA centers on high-pressure-injection control and urethane/epoxy-chemical control. The high-pressure-injection control addresses the pressurized injection — controlled by high-pressure- injection controls (pressure-rated equipment, injection-injury awareness, controlled pressure, safe bleed-down). The urethane/epoxy-chemical control addresses the resins — controlled by urethane and epoxy-chemical controls (respiratory protection where needed, chemical-resistant skin/eye protection, ventilation, exotherm awareness). And the confined/structural location and eye get location and eye controls. An AHA built on high-pressure-injection control and urethane/epoxy-chemical control, with location controls, addresses the hazards that define urethane and epoxy crack injection.
From the field: what actually goes wrong
In fourteen years across federal, heavy civil, and industrial projects, urethane and epoxy crack injection injects urethane resin to seal/waterproof cracks or epoxy resin to structurally bond/repair cracks in concrete and masonry, using injection ports and a pressurized pump/gun, and it closes the joint-protection group and this batch with a hazard profile that stands apart because of the pressure. The high-pressure-injection hazard is the primary defining concern — the resin is injected into the crack under pressure through injection ports using an injection pump or gun, a high-pressure hazard: the pressurized system (pump, hoses, and ports) can fail or burst (hose whip, port blowout), and the high-pressure injection stream can cause a serious high-pressure injection injury if it contacts the skin or hand — this is a real and often underestimated hazard, because a high-pressure injection injury can look like a minor puncture but is a surgical emergency that can cost a finger or hand if not treated immediately. So pump, hose, and port pressure ratings and inspection, never placing hands over the injection point or ports under pressure, controlled pressure, safe pressure relief and bleed-down before clearing blockages, and crew awareness of the injection-injury hazard are essential. The high-pressure injection is the defining hazard.
The urethane/epoxy-chemical-exposure and the confined/structural-location are the other defining hazards. On the projects I have run, urethane (polyurethane) injection resins contain isocyanates (a respiratory sensitizer and skin/eye hazard) and can react with water energetically or foaming, and epoxy injection resins have epoxy resin and hardener/amine components (skin sensitizers/corrosives, with an exothermic curing reaction that gives off heat), so respiratory protection where needed, skin/eye protection (chemical-resistant gloves — the components are skin sensitizers), ventilation, careful mixing, and following the product safety data matter. And the confined/ structural-location hazard is that crack injection is done at cracks in concrete and masonry structural elements, often in confined locations (basements, tanks, tunnels, foundations, and below-grade structures — confined-space procedures where the space qualifies, ventilation in enclosed areas critical given the resin chemistry, and safe access) and at height where the crack is elevated (fall protection). The eye hazard rounds it out. This closes the joint-protection group and the batch. The AHA built on high-pressure-injection control and urethane/epoxy-chemical control is the one that protects the crack-injection crew.
The bottom line
An Urethane and Epoxy Crack Injection AHA names the high-pressure-injection, the urethane/epoxy-chemical-exposure, and the confined/structural-location hazards with specific controls — high-pressure-injection controls (pressure- rated and inspected equipment, injection-injury awareness — never a hand over the injection point under pressure, controlled pressure, safe bleed-down), urethane and epoxy-chemical controls (respiratory protection where needed, chemical-resistant skin/eye protection, ventilation, exotherm awareness, following the product safety data), and confined and structural-location controls (confined-space procedures, ventilation, safe access, fall protection where elevated). The high-pressure-injection control and the urethane/epoxy-chemical control are the defining concerns. The AHA that manages both is the one that protects the crew.
Frequently asked questions
Why is the high-pressure injection the defining hazard?
The resin is injected into the crack under pressure through injection ports using an injection pump/gun — the pressurized system can fail or burst (hose whip, port blowout), and the high-pressure injection stream can cause a serious high-pressure injection injury if it contacts the skin/hand (which can look like a minor puncture but is a surgical emergency). Controls are high-pressure-injection controls (pump/hose/port pressure ratings and inspection, never placing hands over the injection point or ports under pressure, controlled pressure, safe pressure relief/bleed-down before clearing blockages, crew awareness of the injection-injury hazard), and the high-pressure controls.
What urethane and epoxy chemical hazards apply?
Urethane (polyurethane) injection resins contain isocyanates (a respiratory sensitizer and skin/eye hazard) and can react with water energetically/foaming, and epoxy injection resins have epoxy resin and hardener/amine components (skin sensitizers/corrosives, with an exothermic curing reaction — heat). Controls are urethane and epoxy-chemical controls (respiratory protection where needed, chemical-resistant skin/eye protection, ventilation, careful mixing for the exotherm, following the product safety data for the specific resin), and the chemical-exposure controls.
What confined and structural-location hazards apply?
Crack injection is done at cracks in concrete/masonry structural elements, often in confined locations (basements, tanks, tunnels, foundations, below-grade structures) and at height where the crack is elevated. Controls are confined and structural-location controls (confined-space procedures where the space qualifies, ventilation in enclosed areas — critical given the resin chemistry; safe access; fall protection where elevated), and the location controls.
What is urethane and epoxy crack injection?
Urethane and epoxy crack injection is the injection of resin to seal or repair cracks — the crack injection (injecting urethane resin to seal/waterproof cracks, or epoxy resin to structurally bond/repair cracks, in concrete and masonry, using injection ports and a pressurized injection pump/gun). Because the resin is injected under high pressure (with an injection-injury hazard), the urethane and epoxy resins are serious chemical exposures, and the cracks are often in confined and structural locations, those hazards apply.
Related AHAs and JHAs
- Joint Protection AHA — the joint-protection fundamentals
- Joint Sealants AHA — the related joint sealants
- Elastomeric Joint Sealants AHA — the related elastomeric joint sealants
- Epoxy Crack Injection JHA — the crack-injection 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.