Certain T eed – A Rich Legacy Our products stand out because of their quality, style, durability and warranties. CertainTeed is a company rich in history and focused on delivering beautiful and smart living spaces across Canada. For over a century, including 80 years right here in Canada, we’ve been North America’s leading brand of building materials including roofing, siding, drywall, ceilings, and insulation. We’re also a subsidiary of Saint-Gobain, a French company and the world’s largest building materials manufacturer. Our longevity comes from a history of innovative products, our contractor and distributor partners, and more importantly, the exceptional people on our teams. In fact, between CertainTeed and Saint-Gobain, we employ 1,300 people in 22 facilities and sales offices across British Columbia, Alberta, Manitoba, Ontario, Quebec and New Brunswick.