As leaders in building science and sustainable construction, CertainTeed is transforming how we build through its innovative solutions. Through the acquisition of GCP, CertainTeed’s portfolio now includes GRACE ICE & WATER SHIELD® high performing roofing underlayment and VYCOR® weather resistive barriers and tapes. A subsidiary of Saint-Gobain, CertainTeed has more than 6,900 employees and more than 60 manufacturing facilities in the U.S. and Canada offering support, expertise, and availabi