Dimensional Lumber Chart

Dimensional Lumber Chart. Dimension up to 4 inches wide is classified as structural light framing and light framing. If your project calls for precise measurements, be sure to check your lumber before purchasing.

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Dimension 5 inches and wider is classified as structural joists and planks. The grading rules are published in the western lumber grading rules book. Dimension lumber is lumber which has been cut and planed to a standardized width and height.