Workplace Medical Mystery Solved: What Is Making This Roofer Sick?

Ray worked as a roofer and started feeling sick during work. His symptoms started halfway through the first day and, by the end of the second day, he felt even worse with a headache, cough, shortness of breath, and chest tightness. At the doctor’s office, his tests came back normal. Read more about his case  here. When Ray and his coworkers got sick, the roofing company ordered an investigation. On the days crew members got sick, they were placing a rubber membrane on the roof using a spray gun to apply a polyurethane foam. Investigators determined that exposure to 4,4’-Methylene-bisphenyl