Closed Cell foam is what we Spray for all exterior walls. Not only does it add structural integrity it's an air barrier at 1 inch and a class 2 vapour barrier at 2 inches. Spray foam is a unique product compared to other building products. Spray foam is manufactured on-site at the time of application. Most other building products are manufactured
in a factory and delivered to the job site: sheetrock, fiberglass insulation, OSB, roof shingles,
framing lumber, duct work, etc. It can be sprayed directly to any surface such as wood, brick, concrete, drywall, metals (galvanized steel requires at primer)
The number one thing a building owner wants to accomplish as it relates to the exterior walls is to stop the conditioned air inside your building from leaving through ways you can't control. As the saying goes "I want to keep the inside in and the outside out".
Air leakage accounts for 25-40% of the energy used for heating and cooling in a typical home or building. That's the equivalent of always leaving a window open, allowing conditioned air to leave your home and unconditioned air and moisture to enter it through gaps, cracks and holes in the building envelope. At one inch spray foam insulation is a air barrier, with all air infiltration points completely sealed off a dramatic drop in heat loss can be achieved.
