The X-Wall System is a Huntsman Building Solutions wall assembly design concept solution for architects and builders. With X-Wall, closed cell spray foam insulation is installed completely from the exterior and will cut the thermal bridge of the structure. The advantage of the assembly design is that you get all of the required properties of a high-performance building envelope using a single product (closed cell spray foam), which functions as an all-in-one insulation, air barrier, vapor retarder, and water resistive barrier. X-Wall System is an answer to the ever-increasing requirements for continuous insulation (CI), which have led to many buildings now having all the insulation on the exterior. The continuous insulation application of X-Wall System enables much better performance in the areas of R-value and U-factor, as the thermal bridges are reduced. Steel studs can then be thinner and empty, leaving room for electrical systems.