Page 543950 WOOD PRESERVATIVES AND PRESERVATIVE TREATMENTS 950.1 REQUIREMENTS A.General The preservative treatment will comply with the EPA, AASHTO M 133, and the AWPA Standard U1 referenced in AASHTO M 133 and described below. Commodity Specification A – Sawn Products*1 Commodity Specification B – Post Commodity Specification D – Poles Commodity Specification E – Round Timber Piling *1Guardrail posts and blocks will be treated with retention specifications from commodity specification B, use category 4B. B.Preservative Selection 1.Sawn posts, round posts, poles, and lumber in contact with the ground will be treated with preservatives meeting the requirements of ASSHTO M133 or AWPA Standard U1. Commodity Specification A: Sawn Products – use category UC4A Commodity Specification B: Posts – use category UC4A Commodity Specification D: Poles – use category UC4A, UC4B, or UC4C 2.Lumber not in contact with the ground will be treated with preservatives meeting the requirements of AWPA Standard U1 Commodity Specification A: Sawn Products – use category UC3B at a minimum. 3.Round timber piling will be treated with preservatives meeting the requirements of AWPA Standard U1 Commodity Specification E: Round Timber Piling – use category UC4C. C.Western Red Cedar Wood preservative treatment for Western Red Cedar is not required and will be exempt from the above requirements. Page 544960 TIMBER PILING 960.1 REQUIREMENTS Timber piling will conform to ASTM D25 except as follows: The circumferences of piles measured under the bark will have minimum and maximum values as shown in Table below. Circumferences and Diameters of Timber Piles 3 Feet from Butt Tip Minimum Maximum Minimum Length in Feet Circumference (Inches)Diameter (approximate) (Inches)Circumference (Inches)Diameter (approximate) (Inches)Circumference (Inches)Diameter (approximate) (Inches) Douglas Fir, Hemlock, Pine, Spruce or Tamarack Under 40
40-50 incl.
51-70 incl.
71-90 incl.35
Oak and Other Hardwoods, Cypress Under 30
30-40 incl.
Over 4035 Cedar Under 30
30-40 incl.
Over 4035 Piles will be furnished cut to any of the following lengths as specified by the Engineer: 10 feet, 12½ feet, 16 feet, 20 feet, and in multiples of 5 feet for piles longer than 20 feet. Order lengths of 10 feet and 12½ feet may be obtained by cutting 20 foot and 25 foot piles. Piling so obtained will be driven full length and cut off after bearing for the first pile is obtained. The remaining cutoff will be used as the second pile. The requirements of the preceding paragraph will apply to the original full length pile only. Piling will be treated in accordance with Section 950.