EPA's spray foam safety guidance: moved, not gone

Last reviewed: August 4, 2026

If you’ve followed a link to “EPA’s spray polyurethane foam guidance” and hit a page not found, you’re not alone — extension offices, weatherization programs, and contractor sites all over the web still point at EPA pages that no longer answer. Here’s what happened, what the guidance actually said, and the links that still work — so a dead reference doesn’t cost you the information.

What happened to the EPA pages

EPA reorganized its website in 2017. Its Safer Choice program — the one that had published spray polyurethane foam (SPF) safety guidance, under the earlier name Design for the Environment (DfE) — had that SPF section moved off the live site. Today the old addresses (epa.gov/saferchoice/spray-polyurethane-foam… and epa.gov/dfe/…/spray_polyurethane_foam.html) return “page not found.”

The content wasn’t deleted. EPA preserved it on its archive subdomain, archive.epa.gov, and in the January 2017 snapshot of the site. This is housekeeping, not a reversal: the concerns the pages raised still stand, EPA’s separate action plan on the key chemical is still published (below), and regulators — California in particular — have moved forward on the issue since. The links just changed, and most sites never updated them.

What EPA’s guidance said

EPA’s guidance — now archived — framed spray foam’s risk around the chemicals that make it, before they finish reacting:

• Isocyanates (the “A” side). EPA described isocyanates as a leading chemical cause of work-related asthma, capable of “sensitizing” a person so that later exposure to even very low levels can trigger a severe reaction — with no recognized safe exposure level once someone is sensitized.
• The other chemicals (the “B” side). Amine catalysts (eye and vision irritation), halogenated flame retardants, and blowing agents each carried their own cautions.
• The practical thrust. Control skin, eye, and inhalation exposure with proper protective equipment and ventilation during spraying; keep other trades and building occupants out during application and for a period after; and don’t re-enter until the manufacturer’s stated re-occupancy time has passed. That last point — re-occupancy — is the one homeowners most often never hear from a rushed crew.

The through-line: the hazard lives in the wet chemistry and the hours around it, which is exactly why who’s in the building, and when they come back, is the whole safety question.

The links that still work

If you maintain a page that linked the old EPA guidance — or you just want to read it — these archived copies are live as of August 2026:

• Health Concerns about Spray Polyurethane Foam — archive.epa.gov
• Safer Workplace Practices for SPF Installation — archive.epa.gov
• Quick Safety Tips for SPF Users — archive.epa.gov
• Programs Related to Spray Polyurethane Foam — archive.epa.gov
• Best Practices and Safety Tips for Weatherizing with SPF — archive.epa.gov
• Self-Evaluation Checklist for Professional SPF Contractors (PDF) — archive.epa.gov

What’s actually current

The subject is not dormant — if anything it’s more active now than when EPA wrote those pages:

• EPA’s MDI action plan is still published. The 2011 Methylene Diphenyl Diisocyanate (MDI) and Related Compounds Action Plan (PDF, live on epa.gov) laid out isocyanate health risks and the actions EPA was weighing under the Toxic Substances Control Act. MDI is the “A”-side isocyanate in most closed-cell foam.
• California went furthest. The state’s Department of Toxic Substances Control (DTSC) listed Spray Polyurethane Foam Systems with Unreacted MDI as a Priority Product on July 1, 2018, and on February 12, 2026 issued a Revised Notice of Final Determination requiring SPF-systems manufacturers selling in California to give applicators hazard and protective-equipment information, ensure applicators are trained before use, and — unless they adopt a safer alternative — pay into a green-chemistry innovation fund by the pound. It’s aimed squarely at protecting workers and do-it-yourself installers, the exact group EPA’s guidance worried about.
• Consumer guidance that never moved. The U.S. Consumer Product Safety Commission’s health and safety recommendations for consumers (PDF) remain live, as does the industry’s own potential health hazards material from the American Chemistry Council’s Spray Foam Coalition.

What this means if it’s your building

Read the exposure warnings for what they are: a story about the installation — protective gear, ventilation, and the re-occupancy clock — that mostly lands on the crew and on anyone spraying a DIY kit without the right protection. It is not, by itself, a verdict on living with insulation that was sprayed and cured correctly years ago.

Where to go from here depends on your actual question:

• A foam job that already smells or seems wrong — that’s a diagnosis, not a chemistry lecture: what each symptom means.
• Deciding whether to disturb existing foam — inspect before anyone demolishes: why inspection comes first.
• A DIY kit that got foam on skin or where it shouldn’t be — the first-aid steps are here.
• The trade’s chemistry vocabulary — isocyanates, off-ratio, the A and B sides — is defined plainly in the glossary.

We sell no foam and no board products, and we take no manufacturer money — so we can say the boring true thing: the safety question that matters most is who is in the building during and right after the spray, and when they come back. If a quote or a crew won’t answer that clearly, that’s exactly what the form below is for.