Spray Foam as Exterior Insulation has many benefits:
Spray Foam applied continuously on the exterior of a wall provides a continuous “blanket” of air impermeable insulation helping keep the wall cavities and structure warm.
Spray Foam requires no nails or fasteners to hold it in place so its application truly is continuous and less impacted by heat loss through fasteners when compared with other products.
There is less need for tapes and sealants at fasteners and joints the way there is with insulation board products.
Using transition membranes at windows and doors, a continuous layer of air impermeable spray foam over the rest of the wall allows you to obtain high levels of thermal performance and airtightness in one easy step.
The continuous insulation provided by spray foam helps control thermal bridging though framing, especially through steel beams and studs.
The fact that spray foam adheres to the walls helps eliminate air movement around the insulation that could compromise its performance.
A layer of spray foam on the exterior can not only provide Continuous Insulation, but also Air Barrier, Vapor Retarder and a Water Resistive Barrier to protect inner wall elements from moisture.
Spray foam even conforms to complex shapes and curved surfaces making it the product of choice for difficult insulating situations.