Spray foam insulation is commonly used for energy efficiency, but it poses specific risks when installed in unventilated or improperly sealed spaces. Chemical off-gassing can occur for an extended period if curing was incomplete or if the mixture was not properly applied.

Additionally, spray foam can trap moisture inside walls or attics, creating hidden mold risks. If a home includes spray foam insulation, verify that it was installed by a certified professional, that ventilation was adequate during application, and that the space is now properly ventilated. For sensitive individuals, this may be a reason to choose an alternative home.