"K+" Grade

• 1/4" maximum opening
• Any size, number sound knots
• Up to four splits per panel 1/4" x 12"
• Generally used as crossbands under    face and back of an "A" or "B" panel
   (oak and ash use K+ under the face and
   back on all grades
• Smooth peel

"L" Grade

• Any number open defects to maximum 1"
• Any number of solid knots
• End splits up to 1/4"
• Used as center core line in "A" or "B" grade   panel or as crossband under face and back
  of "C" grade or lower birch or maple panel
• Some rough peel

"M" Grade

• Any number open defects up to 2½"
• Any number or size of solid knots
• Rough peel