Logs

Softwood & Hardwood — 

Log Grades

Veneer logs (Highest Quality).

 

Factory Logs (Lumber Quality): The USDA FS usually divide them into 3 grades: F1, F2 and F3.

 

Low quality logs have two classes: construction wood (where appearance is not a concern) and local-use for use in pallets an in products where standards are not required. Straightness (i.e. presence of weeeps) and taper also affect grade.

Grading Factors Tree Grade 1 (F1) Butt 16 16+ Minimum Lenght, feet Maximum number Lenght if grading zone, feet DBH minimum, inches Scaling diameters, inches Clear Cuttings Minimum cumulative lenght of clear cuttings (12-foot section), feet Tree Grade 2 (F2) 13 7 10 2 4 2 3 2 3 3 2 No-limit 11,7 Tree Grade 3 (F3) 16 10 11,7 20+ 10 11,7 Butt 16 13+ 12+ 8 9,3 Butt 16 10+ 8+ 6 7 Minimum cumulative lenght of clear cuttings (14-foot section), feet Minimum cumulative lenght of clear cuttings (16-foot section), feet 13,3 15% 11,7 11,7 10,7 30% 8 50% Maximum sweep and crook allowance

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