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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
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,
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.
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.
Find the column for your dead load and spacing, and the row for your timber size to find the permissible clear span in metres. Click on a span to generate a full calculation (you can adjust the exact span). This span table is to the format and methodology given in BS 5268-7.2.
decking are assumed. JOIST SIZE The span of a joist, L, is measured from the face of support at one end of the joist to the face of support at the other end of the joist and does not include the length of the overhangs, LO. Use Table 2 to determine allowable joist span, LJ, based on lumber size and joist spacing. Joist span, L, must be less ...
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:
