3426Structural Wood

3426.1SCOPE

Provide structural wood for dimensional lumber, joists and planks, beams and stringers, and posts and timbers. A Definitions of Terms ....................................................................................................... ASTM D9 B Nomenclature .......................................................................................................... ASTM D1165

3426.2REQUIREMENTS

A Species of Wood Use West Coast Douglas Fir or Southern (Yellow) Pine unless otherwise shown on the P lans, specified in the Special Provisions, or specified in the purchase order. B Standard Sizes Provide structural wood meeting the dimensions specified for either rough or surfaced stock. C Preservative Treatment Provide wood treated in accordance with 3491, “Preservatives and Preservative Treatment of Wood Products,” if specified. D Grading Provide commercial stress grades of lumber and timber with grade descriptions meeting the stress requirements. The numerical stress values for structural wood required by the C ontract are the minimum requirements. The Contractor may provide stress graded Material meeting grading rules developed from ASTM D45, Methods for Establishing Structural Grades of Lumber, as tabulated by the National Design Specification for Wood Construction (NDS). The Standard Grading and Dressing Rules of the West Coast Lumber Inspection Bureau, the Standard Grading Rules for Western Lumber of the Western Wood Products Association, and the Standard Grading Rules for Southern Pine of the Southern Pine Inspection Bureau each meet the requirements of ASTM D245, Standard Practice for Establishing Structural Grades and Related Allowable Properties for Visually Graded Lumber.

3426.3SAMPLING AND TESTING

Sample and test for preservative treatment in accordance with 3491, “Preservatives and Preservative Treatment of Wood Products.” The Department will make final inspection and acceptance in accordance with the following:

Lumber, Timber, Piling and Wood Treatment