Wilsonart International Inc. Tuesday announced a plan to add about 80,000 square feet onto the largest facility it owns.The Temple north plant, located in the 10500 block of H.K. Dodgen Loop, will be expanded in two areas.Leon Wieland, Wilsonart International senior vice president for manufacturing and operations, said 40,000 square feet will be added to the south side of the plant to consolidate distribution of laminate products.He said the north side of the building would get another 40,000 square feet to create space for automation along with melamine equipment.The project