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  Southern Pine: Grade Marks  

Southern Pine Inspection BureauWhen you buy wood from Spartanburg Forest Products you can be sure you’re getting a great quality product. All of our lumber is graded according to SPIB (Southern Pine Inspection Bureau) grading rules. Once the wood is graded, it is stamped with the SPIB or TPI mark, an industry symbol of quality that you can trust.

For Southern Yellow Pine grades, you will see this mark as an ink stamp somewhere on the piece of lumber. This mark indicates a third party inspection has been completed, adhering to the TPI or SPIB’s standards of quality. Spartanburg Forest Products believes they are just another way we can ensure our customers that they’re getting the best product available.

Understanding the SPIB or TPI grade mark found on Southern Yellow Pine lumber can be a bit challenging. However, every grade mark must contain the items listed and pictured below. This mark assures compliance with standards established by the Southern Pine Grading rules.

Typical Southern Pine Lumber Grademarks

  • 1 The identifying symbol, logo or name of the accredited inspection agency, such as Southern Pine Inspection Bureau (SPIB)
  • 2 Inspection Service:Timber Products Inspection, Inc (TP)
  • 3 Inspection Service: Renewable Resource Associates, Inc (RRA)
  • 4 The grade of lumber
  • 5 The mill identification number
  • 6 Species of lumber, such as Southern Yellow Pine (SYP) or Southern Pine (SP)
  • 7 Optional logo showing that the mill is a member of the Southern Forest Products Association
  • 8 Moisture content is Kiln-dried (KD) to a maximum of 19%
  • 9 Heat treated (HT)