2304.11 Heavy timber construction.
BC § 2304.11
Where a structure, portion thereof or individual structural elements are required by other provisions of this code to be of heavy timber, the building elements therein shall comply with the applicable provisions of Sections 2304.11.1 through 2304.11.4. Minimum dimensions of heavy timber shall comply with the applicable requirements in Table 2304.11 based on roofs or floors supported and the configuration of each structural element, or the applicable requirements in Sections 2304.11.2 through 2304.11.4. Lumber decking shall be in accordance with Section 2304.9. Table 2304.11Minimum Dimensions of Heavy Timber Structural Members SupportingHeavy Timber Structural ElementsMinimum Nominal Solid Sawn SizeMinimum Glued Laminated Net SizeMinimum Structural Composite Lumber Net SizeWidth,InchDepth,InchWidth,InchDepth,InchWidth,InchDepth,InchFloor loads only or combined floor and roof loadsColumns; Framed sawn or glued-laminated timber arches that spring from the floor line; Framed timber trusses886 3/48 1/477 1/2Roof loads onlyWood beams and girders610510 1/25 1/49 1/2Columns (roof and ceiling loads); Lower half of: wood-frame or glued-laminated arches that spring from the floor line or from grade6858 1/45 1/47 1/2Upper half of: wood-frame or glued-laminated arches that spring from the floor line or from grade66565 1/45 1/2Framed timber trusses and other roof framing a ; Framed or glued-laminated arches that spring from the top of walls or wall abutments4 b63 b3 1/2 b5 1/2 For SI: 1 inch = 25.4 mm. a. Spaced members shall be permitted to be composed of two or more pieces not less than 3 inches nominal in thickness where blocked solidly throughout their intervening spaces or where spaces are tightly closed by a continuous wood cover plate of note less than 2 inches nominal in thickness secured to the underside of the members. Splice plates shall be not less than 3 inches nominal in thickness. b. Where protected by approved automatic sprinklers under the roof deck, framing members shall be not less than 3 inches nominal in width.
