What is Spray Foam Insulation?

Spray Foam Insulation (also referred to as Spray Polyurethane Foam) is a method of sealing and insulating that is spray applied like paint.  It is a 2 component system typically consisting of petroleum oils, plastics, and resins.  The 2 liquids are heated at high pressure and mix at the spray gun.  When the 2 liquids hit the target substrate they react with each other and rapidly expand curing as a foam.  Spray Foam Insulations fall under 2 categories Open Cell (also referred to as ½ lb. or low density foam) and Closed Cell (also referred to as 2 lb. or medium density foam).