Weyerhaeuser has added Flak Jacket protection to its Trus Joist TJI joists to meet building code requirements for fire resistance. The specialty coating allows builders to use a single layer of gypsum and no expensive mineral wool to achieve a one-hour fire-rated floor assembly in multifamily buildings (the gypsum layer is unnecessary in unfinished residential basements) and comply with the new 2012 International Residential Code fire protection requirements. 888.453.8358. www.woodbywy.com