let we recall at the background to understand how and when it was introduced. Polyurethane got its start from the U.S armed forces in the 1940 they usually implemented it on the airplanes...
Spray foam insulation is utilized for an alternative of fiberglass insulation. A developed combination of Isocyanate and resin is sprayed around the walls or ceilings where ever one desires to insulate it. Even you can drill divots and spray it...
Closed cell insulation will be the kind of insulation that is denser than open cell. It offers a