817Structural Timber and Lumber

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);

1 , Comodity Specification:

2.1Sawn Products

2.2Posts (including Guardrail)

2.3Poles

2.4Round 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

Structural Timber and Lumber SECTION 817

surface areas the same way. Ensure that treatment reports, boring reports, and assay reports submitted to the department are representative of each shipment.

6 Ensure the provision and use of timber and lumber that has been inspected by an American Lumber Standard Committee (ALSC) accredited third party agency before shipment, that a certificate of inspection is given to the engineer, and that each piece inspected and certified is marked accordingly; wood to be treated may be unmarked. Ensure that untreated lumber has been seasoned to a moisture content of 20 percent or less before shipment.

7 Certification or grade marking does not constitute acceptance; the engineer will reject material not meeting specifications upon delivery.

8 Stack wood stored at the job site to ensure proper ventilation and elevated off the ground; the engineer may reject wood damaged because of improper storage.

9 Provide rough-sawn timber or lumber in accordance with Table 817.1-1, Dimensional Requirements: Rough-Sawn Timber or Lumber.

10 Provide posts in accordance with Subsection 816.10, Treated-Timber Sign Posts.

Table 817.1-1 Dimensional Requirements: Rough-Sawn Timber or Lumber Nominal Thickness/Width in [mm] Allowable Thickness/Width Minimum(1) in [mm] Maximum in [mm] 1 [25] ⅞ [22] 1⅛ [29] 2 [50] 1⅝ [41] 2¼ [57] 3 [75] 2⅝ [68] 3⅜ [86] 4 [100] 3⅝ [92] 4⅜ [111] 5 [125] 4⅝ [117] 5⅜ [137] 6 [150] 5⅝ [143] 6⅜ [162] 7 [175] 6⅝ [168] 7⅜ [187] 8 [200] 7⅜ [187] 8½ [216]

mm] smaller than the indicated minimum tolerance for rough sawn lumber; ensure that the remaining 80 percent of the item length meets specified minimum thickness.