Floor Load Width Single Span

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.

Floor load width single span. Spans shown are in feet 4. For example a joist made from doubled 2 x 6s can span a distance about 25 percent more than a single 2 x 6 but a 2 x 12 can span about 80 percent more than a 2 x 6 even though it has the same amount of wood as a doubled 2 x 6. Spacing should be interpreted as the centre to centre distance between adjacent parallel members. The width is considerably more important than the thickness of a board.

Next consult a span table to cross reference the spacing and span to find the required fb value for that table s load limits. The span table for a 30 psf live load 10psf dead load floor indicates a required fb value of 1 315 and a minimum e value of 1 800 000. Tcdl 10 psf and bcdl 5 psf 3. Dead load weight of structure and fixed loads 10 lbs ft 2.

Roof load width rlw and floor load width flw can be determined from as1684 or from the images below. Live load floor joist span tables in chapter 7 of the state residential code based on the 2012 international residential code. Live load is weight of furniture wind snow and more. Roof rafter span use this table to determine the maximum lengths of roof rafters based on species and grade of lumber spacing dimensions load and slope.

Top and bottom chords braced by structural sheathing 6. I asked my local building official how he checks a deck plan to make sure the joist size and spacing combination will meet requirements of the building code he goes to the 40 lb. 2 grade of douglas fir are indicated below. In the example the joists have a spacing of 16 inches and a span of 11 feet 2 inches.

This chart is for basic reference only. Live load represents the weight of furniture snow etc. Required size for a given span. So the house dimensions will now be 24 x 13.

Maximum span of 2x6 floor joist. Floor joist span use this table to determine the maximum lengths of floor joists based on species of lumber joist spacing and joist size. Tcll top chord floor live load 2. Maximum floor joist span for no.

Openings are to be located in the center of the span max opening width is 24 inches 7. If you have any questions you should contact an engineer. 1 psf lb f ft 2 47 88 n m 2. Live load l 480 total load l 360 5.