SECTION 915 – TIMBER AND TIMBER TREATMENT
915.01 Sawn Timber Posts, Timber Spacers, and Routed Timber Spacers
Manufacture sawn timber posts, timber spacers, and routed timber spacers from Southern pine or Douglas fir with extreme fiber stress in bending in excess of 1,200 pounds per square inch, as assigned according to Southern Pine Inspection Bureau or West Coast Lumber Inspection Bureau grading rules. The manufacturer may rough saw or dress timber posts, timber spacers, and routed timber. Treat timber as specified in 915.05. Submit certification of compliance as specified in 106.07.
915.02 Round Timber Piling
In the manufacture of round timber piling, use Southern pine or Douglas fir conf orming to AASHTO M 168 and ASTM D 25, except that untreated piles having smooth, tight bark need not be peeled. Treat piling as specified in 915.05. Submit certification of compliance as specified in 106.07.
915.03 Dimension Lumber for Sheet Piling
Manufacture sheet piling using Southern pine or Douglas fir No. 2 or better, dressed on 4 sides. Manufacture sheet piling to be tongue and grooved or grooved for splines. Treat sheet piling as specified in 915.05. Submit certification of compliance as specified in 106.07.
915.04 Dimension Lumber, Timber, and Decking for Structures
Use dimension lumber, timber, glued-laminated timber, and decking for structures that conform to AASHTO M 168 with the following modifications:
1.Manufacture dimension lumber and timber from Southern pine or Douglas fir of structural grade that conforms to the grading rules of the Southern Pine Inspection Bureau or the Western Lumber Inspection Bureau. Ensure that the grading is performed by an agency approved by the Board of Review of the American Lumber Standards Committee. Use Southern pine that is designated and graded as No. 2 if 1 1/2 to 3 1/2 inches thick and as No. 1 if 4 1/2 inches or thicker. Use Douglas fir that is designated and graded as Dense No. 1.
2.For decking subjected to vehicular traffic, use timber that is graded as Dense Commercial if Southern pine and Commercial DEX if Douglas fir. Dress timber for bridge decking square edged S4S.
3.For decking used exclusively by pedestrians, use Commercial grade timber that is dressed square edged S4S.
4.Treat timber as specified in 915.05, except do not preserve timber railing systems and decking used by pedestrians with creosote. In addition, do not preserve timber decking to be covered with an HMA overlay with creosote. Submit certification of compliance as specified in 106.07.
Referenced in this section
Timber and Timber Treatment in other states
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Source: Standard Specifications for Road and Bridge Construction, 2019 (rev. 2022-12-21) Edition. Pages 530–530 of 651. View official source ↗