Open-cell spray foam is an air barrier, but is vapor permeable. The figure above shows the XPS insulation detail required at the above grade portion of the foundation wall for cold climate construction to minimize moisture condensation at the cold concrete in the winter months, and minimize inward driven vapor in the summer months.
RADIANT XPS Insulation Board 30mm - 2400 x 600mm - 1.44sqm per board - Box of 6 XPS Blue Board is a rigid, thermal insulation board made from extruded polystyrene XPS foam. Widely used to insulate under concrete slabs, for insulation over concrete roof tops, and for both internal and external wall insulation. | eBay!