“Is Foam Evil?”—that’s how this session was originally titled. Saner heads prevailed: foam is so highly insulating, so airtight, so slick on the jobsite, how could we ask such a question? Wait—it’s just those wonderful features that suck us in and make us love foam and forget about those toxic chemicals, occupational hazards, climate impacts, and faulty installations. Is that evil? Come discuss design choices, material options, and building science with our panel.