How long has spray foam been around?
Polyurethane foam was first invented in the 1940s during WWII by the Bayer Corp. to strengthen aircraft wings. From there building began to have foam sprayed into them as early as 1969. In Canada the National Building Code of Canada first recognized sprayed polyurethane foam as an insulation material in 1985. Each successive code update has had more reference to foam plastics in it 1990, 1995, 2005 NBC respectively. Polyurethane foam has been in consumer products for decades. Seat cushions, doors, mattresses, fridges, coolers etc. It is all around you and most people take it for granted.
