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#1 Grade

Use #1 grade lumber when both strength & appearance are important:

  • Boards contain few, small knots
  • Knots may be no larger than 2 ¾"
  • One hole is permitted every 3 feet
  • No splits larger than the width of the board
  • Stronger than #2 grade because it has fewer and smaller knots
Vertical wooden plank with visible grain and a slightly beveled top edge.
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#2 Prime Grade

Use when appearance is important:

  • Prime grade lumber provides the same structural properties as #1 grade lumber, but has fewer knots and better appearance
  • #2 Prime grade has the strength of #2 grade lumber, but will look better, with fewer knots
Studio image of a 2x4 of #2 prime grade lumber.
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#2 Grade

Use #2 grade lumber when appearance is not important:

  • 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
Studio image of a 2x4 of #2 grade lumber.
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Premium Decking

Use when small knots are desired and appearance is very important:

  • Best appearance (compared to Standard)
  • High-quality lumber
  • Smaller and fewer knots
A studio shot of a premium decking treated lumber board on a white background.
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Standard Decking

Use when a rustic appearance is desired:

  • More knots than Premium grade
  • Knots may be larger
A studio shot of a standard decking treated lumber board on a white background

Lumber Grades

Choose the right lumber grade for your project.

Different projects require different types of pressure-treated lumber. Lumber mills ink-stamp each board with a lumber grade. Grades refer to the quality, strength and appearance of the wood.

Vertical wooden plank with visible grain and a slightly beveled top edge.

#1 Grade

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Studio image of a 2x4 of #2 prime grade lumber.

#2 Prime Grade

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Studio image of a 2x4 of #2 grade lumber.

#2 Grade

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A studio shot of a premium decking treated lumber board on a white background.

Premium Decking

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A studio shot of a standard decking treated lumber board on a white background

Standard Decking

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Where to find ProWood

ProWood® products can be purchased through independent lumberyards and home centers online and across the country.

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