Please Stop by Our Show Room to See Our Numerous Door and Window Options. Truss / Slater - a division of Garretson Lumber - is opening a new window and door showroom in Springfield, IL. The new showroom is located at 4117 West Wabash - next to the Tilted Kilt Pub and Eatery. As Energy Code requirements continue to require more energy-efficient windows and doors, contractors and home owners need to be aware of the many options for both new construction and replacement windows. When replacing or building a new home, it is important to balance energy-efficiencies with total costs. Our window lines offer high value at multiple price levels.