WAL-MAT is a cardboard based Cellulose Insulation product specifically intended for wall-spray applications. Because of its high density fibers, WAL-MAT has superior sound control properties. It may be used to block outside noise as well as sound transmission through interior walls. WAL-MAT is treated with a 100% sodium polyborate flame retardant and is non-corrosive to metal. WAL-MAT provides seamless thermal protection, resulting in significant savings on heating and cooling costs.