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FP-96 English Version - Eastern Federal Lands Highway Division

FP-96 English Version - Eastern Federal Lands Highway Division

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Section 716.) MATERIAL FOR TIMBER STRUCTURES716.01 Untreated Structural Timber and Lumber. Conform toAASHTO M 168 and the applicable standards of the West Coast Lumber InspectionBureau, Southern Pine Inspection Bureau, or other nationally recognizedtimber associations. Mark all pieces with the inspection service, gradedesignation, species, and inspector identity.Do not use boxed-heart pieces of Douglas fir or redwood in outside stringers,floor beams, caps, posts, sills, or rail posts. Boxed-heart pieces are defined astimber so sawed that at any point in the length of a sawed piece the pith liesentirely inside the four faces.716.02 Hardware. Machine bolts, drift bolts and dowels may be mediumsteel. Fabricate washers from gray iron or malleable iron castings unless structuralwashers are specified.Use square headed bolts and nuts. Use a standard commercial type of cut orround nail. Use cut, round or boat spikes, as specified.Galvanize all hardware according to AASHTO M 232 or cadmium plate allhardware according to ASTM B 766 class 12, type III.Use ring or shear plate timber connectors conforming to AASHTO StandardSpecifications for <strong>Highway</strong> Bridges <strong>Division</strong> II, article 16.2.6, TimberConnectors.716.03 Treated Structural Timber and Lumber. Conform to Subsection716.01. Make all dimensional cuts and incisions in the wood before pressuretreatment. Treat the wood according to AASHTO M 133. When wood is tobe painted, use water borne ammoniacal copper arsenate or chromated copperarsenate preservative.Mark all treated wood with an ALSC (American Lumber StandardsCommittee) quality mark certifying conformance with appropriate AWPAstandards.742

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