2x4 Roof Joist Span

Of bearings and is based on uniformly loaded joists.

2x4 roof joist span. Span calculator for wood joists and rafters also available for the android os. 2 are indicated below. Visit the roof framing page for more information on cutting roof rafters and visit the roof pitch calculator for determining rafter lengths based on rise and run. The minimum bearing length is 1 spans values in bold indicate that web stiffeners are required at the osb end panel.

Although 2 inch by 6 inch lumber is used most often in ceiling construction to support 5 foot by 8 foot sheetrock the material commonly used for ceilings other sizes of lumber may be used such as 2 inch by 4 inch and 2 inch by 8 inch lumber. Live load is weight of furniture wind snow and more. Most roof framing is 24 on center and you can still build sheds up to 14 with 2 4 rafters at 24 on center. Rafter span tables use these tables to determine lengths sizes and spacing of rafters based on a variety of factors such as species load grade spacing and pitch.

1 psf lb f ft 2 47 88 n m 2. Ceiling joists of the first floor of a two story structure often serve as floor joists for the second floor. 1 ft 0 3048 m. The spans are based on simple span joists.

The maximum span is measured o c. The size of the ceiling joist also is accounted for in joist spacing. Douglas fir maximum horizontal roof rafter span for lumber grade selected structural and no. But again if you are going to experience heavy loads it just makes sense to err on the side of caution and use 2 6 rafters.

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. Joist span tables use these tables to determine lengths sizes and spacing of ceiling joists. Also available for the android os. Dead load weight of structure and fixed loads 15 lbs ft 2.

Dead load deflection is limited to l 360 and total load deflection is limited to l 240.