Spray-foam insulation installs quickly and offers superior protection against air and ... It's lighter and more than three times as compact as stone or rock wool. ... Additionally, loose insulation laid in an open space like an attic is subject to wind ... wall and ceiling cavities as a liquid that quickly expands and hardens in place.. It provides a hard, durable finish that resists chipping and cracking, yet can be sanded ... Application: Apply by brush, roller, or hopper spray gun depending