3 Ply 2x8 Beam Span Floors

Use two nails on each end and at splices.

3 ply 2x8 beam span floors.

Roof ceiling 2 clear span floors 3 0 3 3 8 3 4. 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. Although single plies are permitted they are not recommended. A double 2x12 beam can span 12 feet.

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. Both headers and girders are beams that are oriented horizontally and transfer load down to walls piers or posts. The values displayed in the resulting table will show nine possible maximum beam spans for the supported length selected. Also available for the android os.

Lumber species southern pine douglas fir douglas fir larch hemlock fir spruce pine fir redwood western cedar ponderosa pine red pine. Span calculator for wood joists and rafters also available for the android os. 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.

Nail each ply of a beam with a minimum of 10d nails. 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. I now have a box beam which is 3 5 inch wide and 10 25 inches high. 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.

In the example the joists have a spacing of 16 inches and a span of 11 feet 2 inches. The bearing is one half of the 6x6 or 2 75 inches. A 2 2x10 can span 10 feet and so on. Next consult a span table to cross reference the spacing and span to find the required fb value for that table s load limits.

Sizing deck beams got a lot easier with the publication of the 2015 international residential code. 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. The numbers in gray indicate the distance between the support posts. 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.