Spray Foam and Isocyanate Exposure
29 CFR 1910.1200 · 29 CFR 1910.134 · This talk in Spanish
Why it matters
Spray polyurethane foam is made when isocyanates, the A-side, react with the B-side in front of the gun. OSHA says the main effects of too much isocyanate exposure are occupational asthma and other lung problems, plus eye, nose, throat, and skin irritation. Today: who needs to be in the spray zone, and what everyone in it wears.
Hazards
- ⚠ Isocyanate mist inhaled during spraying
- ⚠ Occupational asthma and other lung problems
- ⚠ Skin and eye contact with A-side chemical and fresh foam
- ⚠ Other trades wandering into the spray zone unprotected
- ⚠ Off-gassing in poorly ventilated spaces after application
- ⚠ Heat from thick foam passes and trimming fresh foam
Controls and safe practices
- ✓ Only essential, protected workers in the spray zone; post it and keep other trades out during and after spraying per the product re-entry time.
- ✓ Sprayers wear the respirator the SDS and our respirator program require, fit tested if it is tight-fitting.
- ✓ Full skin coverage for spray crews: coveralls, gloves, eye protection against mist.
- ✓ Ventilate during and after: exhaust fans running through the re-occupancy period.
- ✓ Read the SDS before the first lift; know the symptoms: chest tightness, trouble breathing, and eye, nose, throat, or skin irritation.
- ✓ Report breathing symptoms immediately; early sensitization signs decide whether you keep this trade.
- ✓ No hot work near spray foam; check the SDS for fire hazards.
What OSHA says
Exact words from the official text, with a link to each paragraph.
“A respirator shall be provided to each employee when such equipment is necessary to protect the health of such employee. The employer shall provide the respirators which are applicable and suitable for the purpose intended.”
“The employer shall ensure that employees using a tight-fitting facepiece respirator pass an appropriate qualitative fit test (QLFT) or quantitative fit test (QNFT) as stated in this paragraph.”
“The employer shall maintain in the workplace copies of the required safety data sheets for each hazardous chemical, and shall ensure that they are readily accessible during each work shift to employees when they are in their work area(s).”
“Employers shall provide employees with effective information and training on hazardous chemicals in their work area at the time of their initial assignment, and whenever a new chemical hazard the employees have not previously been trained about is introduced into their work area.”
“The main effects of hazardous exposures are occupational asthma and other lung problems, as well as irritation of the eyes, nose, throat, and skin.”
Site check before the talk
Walk the site and tick each line. Each line comes from the text quoted above.
- ☐Sprayers get a respirator from the company that is right for isocyanate spray. (29 CFR 1910.134(a)(2))
- ☐Anyone in a tight-fitting respirator has passed a fit test for that make, model, and size. (29 CFR 1910.134(f)(1))
- ☐The SDS for both the A-side and B-side are on site and easy to reach every shift. (29 CFR 1910.1200(g)(8))
- ☐Every worker near spray foam has been trained on its chemical hazards before starting. (29 CFR 1910.1200(h)(1))
- ☐Know the warning signs: chest tightness, trouble breathing, and eye, nose, throat, or skin irritation. (OSHA Safety and Health Topics: Isocyanates)
Quotes checked word for word against the official OSHA text on October 5, 2026. This is a summary for a crew talk, not legal advice; the full official text governs. How we check
Crew discussion questions
- When is spraying scheduled, and how are other trades kept out?
- What is the re-entry time for the product we use?
- What respiratory protection do our sprayers actually wear?
- Has anyone felt chest tightness after foam days? Say it now, not after it is permanent.
Applicable OSHA standards
29 CFR 1910.1200, 29 CFR 1910.134
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