Ceiling Joist Span Tables
Listed are 46 tables based on common loading conditions for floor joists ceiling joists and rafters.
Ceiling joist span tables. The range of values in the tables provides allowable spans for all species and grades of nominal 2 inch framing lumber customarily used in construction. These span tables are for 16 oc. Although 2 x 4s are included in the official table they are not listed because it is never advised to use them. This ceiling joist span table is based on the 2012 irc for uninhabitable attics with limited storage.
Joist span tables use these tables to determine lengths sizes and spacing of ceiling joists. Tables such as those for rafters floor joists and ceiling joists require the spacing of members to be known. Simplified maximum span tables for selected visual and mechanical grades of southern pine lumber in sizes 24 thru 212. Plain ceilings are sized at 10 lb loads while the ceilings with storage are sized for 20 lb loads.
Or selected in order to obtain the required size for a given span. These span tables assume installation of at least three joists or rafters that are spaced not more than 24 on center. View joist rafter tables. The calculated spans assume fully supported.
Use the span tables below to determine allowable lengths of joists and rafters based on size and standard design loads. Spacing should be interpreted as the centre to centre distance between adjacent parallel members. If this is the case with your structure use the floor joist table to determine maximum joist lengthload. Find the maximum spans for ceiling joists according to the 2018 international residential code using the most common types of lumber with these simplified span tables.
Ceiling joists of the first floor of a two story structure often serve as floor joists for the second floor. Table r80241 ceiling joist spans for common lumber species uninhabitable attics without storage live load 10 psf ld 240. Roof load width. Building control guidance note subject ceilings and flat roofs timber sizes and construction details 09 issued 010413 rev page 1 of 2 the following tables give details of the allowable spans and spacing for some of the more common timber.
You can also use the wood beam calculator from the american wood council website to determine maximum rafter and joist lengths. It covers 2 common lumber species and sizes at 20 pounds per square foot load. Also available for the android os. Spans for ceiling joists shall be in accordance with tables r80241 and r80242.
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.
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