National Gypsum has announced that effective with shipments on and after Monday, May 2, 2011, National Gypsum will be increasing their wallboard and specialty product prices by 15%. Other price increases are mentioned in the letter, as well (link below). In addition, they say to expect additional price increases to take place in the 3rd and 4th quarters. They state that these increases are necessary due to rising costs associated with raw materials and energy.
National Lumber Drywall Division