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What are the design values for CCA-treated wood?

April 26, 2017cca-treated design values wood

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What are the design values for CCA-treated wood?

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Since pressure treatment with Wolman® CCA preservative does not alter the natural characteristics of wood, the design values for untreated lumber and plywood should be used in accordance with the National Design Specification for Wood Construction (2001 edition), issued by the American Forest and Paper Association. Wood products which have been preservative-treated are referenced in Section 4.3.14 and 6.1.4. If lumber is not dried after treatment, or if the end use will result in a moisture content exceeding 19%, wet service factors shall be applied (see 4.1.4 and 4.3.3). In addition, load duration factors greater that 1.6 shall not apply to structural members. The design values for all acceptable species and grades of lumber are given in the Supplement to the National Design Specification.