3 Ply 2x8 Beam Span Floors

When supporting joists that span 12 feet with no overhang beyond the beam a double ply beam can span in feet a value equal to its depth in inches.

3 ply 2x8 beam span floors.

Lumber species southern pine douglas fir douglas fir larch hemlock fir spruce pine fir redwood western cedar ponderosa pine red pine. While every effort has been made to insure the accuracy of the information presented and special effort has been made to assure that the information reflects the state of the art neither the west coast lumber inspection bureau the american wood council nor its members assume any responsibility for any particular design prepared from this online span calculator. Connecting the posts are beams made of a 2x8 a 1 2 inch by 7 inch strip of plywood and another 2x8 all vertical. 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.

Sizing deck beams got a lot easier with the publication of the 2015 international residential code. For example a 3 ply 2x8 beam would use three 2x8s nailed together side by side. Deck builders can now refer to section r507 6 deck beams and table r507 6 deck beam span lengths to determine the size of 2 ply and 3 ply built up beams made from 2 6 through 2 12 lumber. In the example the joists have a spacing of 16 inches and a span of 11 feet 2 inches.

Use two nails on each end and at splices. Both headers and girders are beams that are oriented horizontally and transfer load down to walls piers or posts. The bearing is one half of the 6x6 or 2 75 inches. A 2 2x10 can span 10 feet and so on.

Dimensional lumber deck beam span chart. Then a 2x4 on top now that the beam is 3 5 inches wide lying down and another 2x4 on the bottom. Beam and joist span tables built up wood floor beams supporting one floor in a house maximum spans for uniformly distributed loads species and grade supported built up beam size joist length 3 2x8 4 2x8 3 2x10 4 2x10 3 2x12 4 2x12 8 9 8 11 2 11 10 13 8 13 8 15 10 10 8 8 10 0 10 7 12 2 12 3 14 2. The values displayed in the resulting table will show nine possible maximum beam spans for the supported length selected.

Although single plies are permitted they are not recommended. Span calculator for wood joists and rafters also available for the android os. Roof ceiling 2 clear span floors 3 0 3 3 8 3 4. Also available for the android os.

Next consult a span table to cross reference the spacing and span to find the required fb value for that table s load limits. I now have a box beam which is 3 5 inch wide and 10 25 inches high. These nine beam spans are for built up beams made up of either 2x8 2x10 or 2x12 dimensional lumber nailed together as either 3 4 or 5 ply beams. The numbers in gray indicate the distance between the support posts.