Microllam LVL Beams WeyerhaeuserTechnical Bulletins Resource Sheets tb 500 Design Guide for 20 22 and 24 Microllam LVL tb 305 Resawing Microllam LVL Parallam PSL and TimberStrand LSL Products tb 501 Performance of Microllam LVL with Watershed Stability Overlay tb 112 Moisture Effects on Weyerhaeuser Engineered Wood Products