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range of values in the tables provides allowable spans for all species and grades of nominal 2-inch framing lumber customarily used in construction. These span tables assume installation of at least three joists or rafters that are spaced not more than 24" on center. The calculated spans assume fully supported members,
All members are manufactured from H3 LOSP Radiata to either an F7 or GL8 structural grade and are to be used in accordance with the relevant span table. Product grading of all members is compliant with AS1720 : Timber Structures.
Steel roof deck and open web steel joist is the predominate roof system in the United States for large flat roof structures. This system is the preferred choice of developers for its simplicity, strength, fire resistance, and economy. Large distribution warehouses, big-box retail, industrial and single-story commercial buildings all
TABLE W-2 DESIGN VALUES FOR jOISTS AND RAFTERS - MECHANICALLY GRADED LUMBER1,2. These Fb values are for use where repetitive members are spaced not more than 24 inches. For wider spacing, Fb values shall be reduced 13%. Values for surfaced dry or surfaced green lumber apply at 19% maximum moisture content in use.
Span tables can be used to determine the size of a timber member of a particular strength class required for a given span. They also tell you what the maximum spacing should be between each section or timber member.
This guide features TJI® joists in the following sizes: Depths: 91⁄2", 117⁄8", 14", 16", 18", 20", 22", and 24" Flange Widths: 13⁄4", 21⁄16", 25⁄16", and 31⁄2" Flange height and thickness vary by series; see the appropriate sections of this guide for specific sizes and relevant technical information:
A JJI-Joist is a composite engineered timber joist combining 45mm deep high-grade finger jointed softwood flanges with a 9mm thick oriented strand board web. Four flange widths are available at 47, 63, 72 and 97mm wide.
