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In this post we will learn to correctly size a ceiling joist based on its span, spacing and type of lumber used. Ceiling Joist Loads. Ceiling joists are sized based on one of two tables found in the code. These span tables list allowable ceiling joist spans for common lumber sizes based on what design load scenario is applied.
joists are spaced at a uniform 8 feet o.c. across the building, bearing on the 56 ft long open web steel joist girders. The roof height ranges from 32 ft to 36 ft with a 37 ft parapet height.
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, properly sheathed and nailed on the top edge of the joist or rafter. Straight-line interpolation shall be permitted for intermediate spans and design values. 2.UMBER DESIGN VALUES L
Ceiling Span Table Notes. 1. For unbraced sections, allowable moment is based on AISI S100-07 with S2-10 Supplement, section C3.1.2 with weak axis and torsional unbraced length assumed to be the listed span (completely unbraced).
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:
Standard spacing between floors joist is 16 inches. A #2-SPF 2×6 ceiling joist can allow to span 15 feet and 2 inches at 12″ oc, 13 feet and 9 inches at 16″ oc and 12 feet and 0 inches at 24″ oc. A #2-SPF 2×8 ceiling joist can allow to span 19 feet and 1 inch at 12″ oc, 18 feet and 2 inches at 16″ oc and 15 feet and 10 inches at 24″ oc.
The tables provide ceiling joist spans for live loads of 10 and 20 pounds per square foot (psf) (479 Pa and 958 Pa) and dead loads of 5 and 10 psf (239 and 479 Pa). The weight of the ceiling joist is included in the 5 or 10 psf (239 or 479 Pa) dead load.
