Floor System Span Chart

Listed are 46 tables based on common loading conditions for floor joists ceiling joists and rafters.

Floor system span chart.

Live load l 480 total load l 360 5. Spans shown are in feet 4. Looking at this table you will see there is a choice in the size of floor joist 2 x 6 2 x 8 2 x 10 or 2 x 12 and there is a choice in the joist spacing 12 16 or 14. Openings are to be located in the center of the span max opening width is 24 inches 7.

Rafter spans can be extended slightly beyond what the rafter tables suggest when there is a cantelever extending beyond the supporting wall. Top and bottom chords braced by structural sheathing 6. Ceiling joist span use this table to determine the maximum lengths of ceiling joists based on species of lumber joist spacing and joist size. The table excerpt above is simply a sample and may not be valid for your region.

Engineered wood products ewp span and size charts for bci joists. 1 ft 0 3048 m. Basic lumber design values are f 2000 psi f 1100 psi f 2000 psi e 1 800 000 psi duration of load 1 00. Our joist span charts are for wood joists with a maximum dead load of 10 pounds per square foot and a live load of 40 pounds per square foot.

2 grade of douglas fir are indicated below. Floor truss span tables alpine engineered products 17 these allowable spans are based on nds 91. Maximum deflection is limited by l 360 or l 480 under live load. Tcll top chord floor live load 2.

Live load represents the weight of furniture snow etc. Design properties 16 floor span and load tables 17 allowable holes 18 roof span and load tables 19 cantilevers 20 21 framing connectors 22 23. Dead load is the weight of the structure and any fixed items. The widest span in the floor joist span table in part 2 of this tutorial module showed that floor joists can span 17 2 if they are 2 x 12s spaced 12 o c.

Simplified maximum span tables for selected visual and mechanical grades of southern pine lumber in sizes 2 4 thru 2 12. Spacing of trusses are center to center in inches. Live load is weight of furniture wind snow and more. Floor span and load tables 7 8 tips for preventing floor noise 8 allowable holes 9 cantilevers 10 11 roof span and load tables 12 13 framing connectors 14 15 section 2.

Sample floor joist span table. If you have any questions. Let s expand our house beyond that 17 2 span capability to 24 feet wide. This chart is for basic reference only.

Bci joists are specially constructed i joists with flanges made from strong versa lam laminated veneer lumber with oriented stranded board webs and approved waterproof structural adhesives providing outstanding strength and durability. The floor joist spacing is the distance between the centers. 1 psf lb f ft 2 47 88 n m 2. So the house dimensions will now be 24 x 13.