Dimensional Timber Post Grades Grade
4 in × 4 in [100 mm × 10 mm]
No. 1 Structural Light Framing
4 in × 6 in [100 mm × 10 mm]
No. 1 Structural Joists and Planks
6 in × 6 in [150 mm × 150 mm] and larger (1)
Select Structural Posts and Timbers
(1)
Rough cut Southern Yellow Pine and Douglas Fir drilled for breakaway are unacceptable. Nominal surfaced Southern Yellow Pine and Douglas Fir drilled for breakaway are acceptable. All other rough cut or surface pine species are acceptable.
746
Structural Timber and Lumber
817.1Structural Timber and Lumber
1 Ensure the provision and use of structural timber and lumber as specified, including
species and grade. When specifying surfaced lumber, the department uses nominal sizes in accordance with American Lumber Standards. 2 Ensure the provision and use of timber and lumber that has been graded before shipment
and in accordance with the current standard grading and dressing rules of the West Coast Lumber Inspection Bureau (WCLIB), WWPA, or other agencies approved by the Board of Review of the American Lumber Standards Committee in accordance with US Department of Commerce product standard PS-20. Provide redwood in accordance with grading requirements of the California Redwood Association for “Construction Heart.” 3 For treated timber and lumber, in addition to certification, provide assay reports and
boring reports for each charge of material supplied. The department does not require treatment of redwood. 4 Ensure that:
Category 4B (UC4B);
2.1 2.2 2.3 2.4
Sawn Products Posts (including Guardrail) Poles Round Timber Piling
wood guardrail posts, wood fence posts, wood sign posts, etc.): and
5 Ensure that millwork, adzing, framing, cutting, and boring has been completed before
pressure treatment. If field cutting and boring is allowed and performed after treatment, ensure that resulting cuts and holes are thoroughly swabbed, sprayed, or brushed with two coats of a preservative approved by the AWPA for field use or repair; treat damaged
747
Structural Timber and Lumber