Ceiling Joist Span Calculator
Joist span tables use these tables to determine lengths sizes and spacing of ceiling joists.
Ceiling joist span calculator. The beam span length is fixed for this demo version. Also available for the android os. Span calculator for wood joists and rafters also available for the android os. View joist rafter tables.
Also available for the android os. Calculate the span for floor and ceiling joist with this free and simple online calculator. This ceiling joist span table is based on the 2012 irc for uninhabitable attics with limited storage. The full version allows you to design beams of any size.
Listed are 46 tables based on common loading conditions for floor joists ceiling joists and rafters. The resulting spans are less than the 2012 irc codes but they are to our standards at scotts framing. Use the span tables below to determine allowable lengths of joists and rafters based on size and standard design loads. 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.
Ceiling joists of the first floor of a two story structure often serve as floor joists for the second floor. For other grades and species and for other loading conditions refer to the awc stjr. 2 x 12s are not listed because you can span pretty much whatever you want. The spans for joists according to the code is far more than we find acceptable.
Spans for ceiling joists shall be in accordance with tables r80241 and r80242. It covers 2 common lumber species and sizes at 20 pounds per square foot load. Table r80241 ceiling joist spans for common lumber species uninhabitable attics without storage live load 10 psf ld 240. You can also use the wood beam calculator from the american wood council website to determine maximum rafter and joist lengths.
Although 2 x 4s are included in the official table they are not listed because it is never advised to use them.
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