Is Sprayed Polyurethane Insulation Safe?
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Image Credit Lloyd Alter It's getting harder and harder to know what to use in green building. Sprayed polyurethane foam is a favourite among green builders because of its high R value and tight seal, but the Environmental Protection Agency is raising some questions about its safety. Tristan Roberts at BuildingGreen explains that the issue is "Isocyanates, such as MDI (methylene diphenyl diisocyanate), that are chemicals that react with polyols to form polyurethane." It is evidently not a problem when it is cured, but more and more do-it-yourself types are using the stuff. ... Read the full story on TreeHugger