GacoOnePass is the first 2 Lbs. density Closed Cell foam in the industry which can be installed in up to 4" passes which reduces labor costs by 50 percent or more and offers 20-30 percent higher yields than standard 2 Lbs. foams when sprayed in one pass at 3-4" thickness. GacoOnePass is ideal for use in a variety of residential and commercial applications and it can be used in deep fill applications with up to 18" in depth per pass for applications like trench fill, pipe erosion control, container filling, etc. It is Appendix x approved for use without an additional ignition barrier and meets the requirement for a Class II vapor retarder at just 0.44".