02190.30 1077 Section 02190 - Preservative Treatment of Timber Description
02190.00 Scope - This Section includes the requirements for preservative treatment of lum ber,
timber, round timber piling, guardrail posts and blocks, sign posts, fence posts, and other items as specified. Materials
02190.10 General - All preservative treatment shall be according to AASHTO M 133 and its
referenced AWPA Standards, except us e the following according to the AWPA Standard: • Category UC4C, Commodity Specification Section E for round timber piling in fresh water and on land. • Category UC5A, Commodity Specification Section G for round timber piling exposed to salt or brackish water . • Category UC4B, Commodity Specification Section A for fence and sign posts. • Category UC4B, Commodity Specification Section A for guardrail posts and blocks.
02190.20 Drying After Treatment - When using waterborne preservatives, dry items according to
AWPA T1, Section 7. During the drying period and until the treated items are installed on the Project, separate each layer of treated items using spacers that are at least 1/2 inch thick. The maximum moisture content shall be 19 percent prior to installation. Collect all spacers and other treated wood waste from the construction site and dispose of them according to 00290.20.
02190.30 Field Treatment - Field -treat cuts, abrasions, bolt holes, drilled surfaces or any other
damaged wood sur faces according to AWPA M4, Section 6 with a preservative from the QPL.
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