Double 2x8 Floor Joist Span

Joist span and spacing is set by your local building code.

Double 2x8 floor joist span.

Floor joist span tables for various sizes and species of wood. The current floor joists are 2x8 and span the 24 feet but there is a wall mid way. Maximum floor joist span for no. Also available for the android os.

A 2 2x10 can span 10 feet and so on. 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 numbers in gray indicate the distance between the support posts. 1 psf lb f ft 2 47 88 n m 2.

Live load is weight of furniture wind snow and more. A double 2x12 beam can span 12 feet. So can it span twice the distance. Spans in this table were derived from the irc table r502 3 1 2 design criteria.

We have steel columns in the basement supporting the house. When building a house or even a deck it is important to confirm you have the correct joist sizes spans and spacing before you get started. While most residential construction uses 2x8 joists with 16 inch spacing there are many other factors you need to consider when determining the proper joist span length. Or do we need to do a header to support the second level.

2 grade of douglas fir are indicated below. Joist span table use these tables to determine floor joist spans based on grade of lumber size of joist floor joist spacing and a live load of 30 lbs ft 2 or 40 lbs ft 2 these tables can also be used to determine deck joist span. Span calculator for wood joists and rafters also available for the android os. If we were to double up the joists to add additional support would that work.

Dimensional lumber deck beam span chart. 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. Nope if you put 2x4 and 2x8 in a span calculator it is not 4 times the distance. Hem fir 2 joists with a live dead load of 40 10 psf.

If you instead make them one on top of the other so 2x4 becomes 2x8 it is 4 times as strong. Dead load weight of structure and fixed loads 10 lbs ft 2.