BORG lumber


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I assume we're talking framing lumber. #2 Prime is the grade. #2 is a specific structural standard:

This is #2
  • Grain slope must meet a minimum 1/8-grain slope (the less deviation from straight grain parallel to the edge, the stronger the piece of lumber).
  • Boards contain splits no larger than 1.5 times width of board
  • Knots may not be larger than 3 1/2"
  • One hole is permitted every 2 feet
  • May have wane (bark edge) on corners
  • More knots and bark edges than #1 grade
The PRIME designation says it's the same strength wise as #2 but has less holes, wane, and skip so it looks nicer.