Highest quality lumber available, specially selected for strength, straightness, and appearance
from spruce, pine, and fir. Commonly used for platform-frame construction, or sold in large DIY stores in Japan.
High quality lumber, prioritizing strength and appearance. Minimal splitting, no knots larger than
2.75”. Generally used for structural framing, and framing where appearance is a factor.
High quality lumber, 2” or wider, selected for strength. Low level of splitting, larger knots, and
some warping of materiel. Used for light structural framing, such as trusses, lintels, and rafters..
Average quality lumber, used for general framing and construction purposes. Some splitting,
and high level of knots. Commonly seen in residential framing.
Low quality lumber, generally used for non-permanent applications, such as temporary bracing,
or dunnage. High levels of splitting, warping, and knots.
Fully dimensional, ungraded rough lumber, generally from fir or spruce. Most often used for
pipeline skids and timber-framing..