March 30, 2008

Yes, cured spray polyurethane foam is relatively inert and studies indicate that SPF does not release toxic gases or leach harmful chemicals into the soil.

However, during application, fumes and mists from the spraying process are created that can be harmful. The two basic chemical ingredients or compounds in all spray foam systems are diisocyanates (monomeric MDI and polymeric MDI) and polyol resins. Contact with these ingredients in vapor, liquid, or particle form can pose a number of health effects to your skin, eyes, and respiratory system. An overexposure to diisocyanates can also cause skin and respiratory sensitization.

Applicators and other persons within a close proximity to the spray operation could be exposed to fumes beyond OSHA and NIOSH requirements and spills. Precautions should be made for applicators, helpers and building occupants to be protected from these fumes, mists and spills. Typically for the applicator this would include respirator, solvent resistant gloves and protective clothing. The zone where protective equipment is required can vary depending on the amount of open space and free ventilation. For example on a roof top, outside of a few feet the fumes dissipate rapidly, while in an enclosed room, fumes and mists can build. Each job should be assessed and a safety plan developed specific to the application.