What Is The Difference Between Grade 1 And Grade 2 Lumber

Species grade spacing and loads make a big difference when building with 2x8s or other dimensional lumber as does the use planned for the timber. Grade rules are intended to be the worst case allowable on a board - but NOT the entire order.


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Table R5075 of the 2018 IRC identifies beam spans for different joist lengths and Tables R6027 123 header spans.

What is the difference between grade 1 and grade 2 lumber. The result was 1 to 2 knots on every board and we had no recourse with a grade dispute. When interpreting grade rules this is where the integrity of the mill really comes into.


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