Rooftop ductwork Post New Topic | Post Reply
Posted: Jun 03, 2017 02:57 PM
Rooftop ductworkI want to sprayfoam ductwork for a rooftop HVAC system. I want to use closed cell spray foam and coat it with Bayseal Bayblock II acrylic coating.
According to the International Mechanical Code, all ductwork must have a flame spread index of <25 and a smoke developed index of <50.
Does anyone have any experience with spray foam insulation on ductwork?
Can a fire lock product be applied in conjunction with the Bayblock II coating to achieve the lower fire protection numbers needed?