We often see a lumber grade stamp with an "S- P- F" mark, implying that the lumber species may be Spruce, Pine, or Fir. "Hem- Fir" mark is another example of combining two or more species-Hemlock and Fir. What is the reason for combining different species into one group?

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The Answer of We often see a lumber grade stamp with an "S- P- F" mark, implying that the lumber species may be Spruce, Pine, or Fir. "Hem- Fir" mark is another example of combining two or more species-Hemlock and Fir. What is the reason for combining different species into one group?

We Often See a Lumber Grade Stamp with an "S-