There are plenty of different types of spray foams on the market, Icynene is bad but Lapolla is excellent, open cell and breathable. Dont get delay by just the phrases "spray foam" This graphic shows Icynene foam sprayed amongst a number of attic trusses. Correctly, icynene foam and polyurethane foam https://dantebzsj432210.anchor-blog.com/13164777/little-known-facts-about-icynene