The Restoration Millwork PVC beadboard trim profiles fit together seamlessly with a notched shiplap design that leaves a large concealed nailing area. The low-maintenance 3TL profile is 8 1/2 inches wide and installs 30 percent faster than standard-width beadboard, the maker says. The boards resist rotting, warping, moisture, and insects. CertainTeed. 800.233.8990.