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Common  WoodsContinued - 14069_196
LAMINATED LUMBER

Engineering Aid 3 - Beginning Structural engineering guide book
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Table 6-2.-Nominal and Dressed Sizes of Lumber significant   defects   but   no   knotholes   or   other serious  defects.  It  must  be  suitable  for  use  as grain-tight lumber. No. 3 common contains a few defects,  larger  and  coarser  than  those  in  No.  2; for  example,  occasional  knotholes.  No.  4  is  low- quality  material,  contains  serious  defects  like knotholes, checks, shakes, and decay. No. 5 com- mon  holds  together  only  under  ordinary  handling. STRUCTURAL  LUMBER  is  graded  accord- ing to allowable stresses that determine its safe No.   2   common   contains   a   limited   number   of load-carrying capacity. This capacity is based on various  factors,  such  as  species  of  the  wood, density,  moisture  content,  and  other  character- istics  that  affect  the  strength  of  the  lumber. Factory and shop lumber is generally graded by its  intended  use;  the  grades  vary  greatly  from  use to  use. Board Measure The basic unit of quantity for lumber is called a BOARD FOOT. It is defined as the volume of 6-7







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