Duct board with low weight water repellant mat

摘要

A duct board or duct liner product is provided comprising an insulating layer formed from fibrous material bound with a resin binder; an outer facing layer adhered to an outer surface of the insulating layer; and a water repellant mat facing adhered to an interior surface of the insulating layer opposite the outer surface to form a duct board material, the mat facing having a weight of less than 1.1 lb/100 ft<2 >(53.6 g/m<2>) and having at least an INDA 2 water repellence rating using the IST 80.6-92 water repellency test method.