Floor Joist Span 2x8

If the span is 6 feet or less use 2x6 s if the span is 8 feet or less use 2x8 s less than 10 feet 2x10 s etc.

Floor joist span 2x8.

Of bearings and is based on uniformly loaded joists. 1 ft 0 3048 m. 1 psf lb f ft 2 47 88 n m 2. Spans in this table were derived from the irc table r502 3 1 2 design criteria.

Residential structural design vertical structural forces we were about to start learning about floor joist span tables. In typical deck construction with a ledger on one side of the joist and beam on the other the size of the joists is driven by the size of the deck and based on the general maximum spans mentioned above. The minimum bearing length is 1 spans values in bold indicate that web stiffeners are required at the osb end panel. A 2x8 joist was not used for floor framing during my public experience as a builder 2x10 was the minimum width for floor joist in house construction and the common length was 16ft per 24ft span.

That theory seemed safe enough for me to adopt as a. Continuing on from part 1. Dead load weight of structure and fixed loads 10 lbs ft 2. 2x10 to 15 feet and 2x12 to 18 feet.

If i sister a 2x8 to each 2x6 meaning that the bottoms of the joists line up but the top of the 2x8 is approximately 2 inches above the top of the 2x6 is there a span table for such a situation or any rule of thumb for estimating strength as per code. However it is important to understand that all substantial spans should be properly engineered especially with the. Maximum floor joist span for no. The maximum span is measured o c.

Assume that i have an attic which currently has 2x6 joists on 16 inch centers. A 2x8 up to 12 feet. The larger the deck the larger the joists. Hem fir 2 joists with a live dead load of 40 10 psf.

Dead load deflection is limited to l 360 and total load deflection is limited to l 240. 2 grade of douglas fir are indicated below. 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. The spans are based on simple span joists.

Don t worry you won t need to do a lot of calculations in determining the size and placement of the structural framing within your house design.