CertainTeed Corporation has achieved GreenCircle certification for its Restoration Millwork Exterior Trim, designed to enhance the sustainable appeal and environmental transparency with its 21 percent recycled content, according to the company. Made from cellular polyvinyl chloride, the full line of Restoration Millwork trim, beadboard and accessories is engineered to look, feel and work like lumber. Unlike wood, however, it is made with a long-lasting, low-maintenance material that is resistant to rotting, warping, moisture and insects, according to the company. It can be cut using ordinary woodworking tools and fastened with nails or screws. The product also withstands yellowing caused by UV rays and resists freezing during winter months. It is backed by CertainTeed’s 25-year limited warranty.