Therma-Tru® is the leading entry door brand most preferred by builders and remodelers. Founded in 1962, Therma-Tru pioneered the fiberglass entry door industry. Today Therma-Tru offers a complete portfolio of entry and patio door system solutions, including decorative glass doorlites, sidelites and transoms, and door components. JB Sash is Therma-Tru’s key retailer in the Boston market. See Therma-Tru, Classic-Craft, FiberClassic and Smooth-Star doors on display in our state-of-the-art showroom. Let our well-trained sales staff assist you with all your Therma-Tru needs. Make a statement with your home by replacing your drafty old door with an energy efficient, maintenance-free Therma-Tru Door System from JB Sash.