Ceiling Joist Sizes
These tables can help calculate whether floor joists are strong enough to support themselves and the load they carry without the help of any walls underneath.
Ceiling joist sizes. From the table the minimum is 50x97mm which is approximately 2x4 in but it doesnt give any indication of the load that that will bear. This ceiling joist span table is based on the 2012 irc for uninhabitable attics with limited storage. Surveyors and structural engineers use data from tables below to help calculate the size of timbers necessary to give adequate support to timber floors. Spans for ceiling joists shall be in accordance with tables r80241 and r80242.
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. A 2 by 4 inch joist for instance hangs into the room by 4 inches which may leave the ceiling high while a 2 by 12 inch joist in the same position hangs 12 inches into the room which decreases the ceiling height by 8 inches. For other grades and species and for other loading conditions refer to the awc stjr. Ceiling joists of the first floor of a two story structure often serve as floor joists for the second floor.
Although 2 x 4s are included in the official table they are not listed because it is never advised to use them. 2 x 12s are not listed because you can span pretty much whatever you want. Ive found this page of common domestic floor joists sizes. Table r80241 ceiling joist spans for common lumber species uninhabitable attics without storage live load 10 psf ld 240.
Building control may ask for. The size of the ceiling joist also is accounted for in joist spacing. Lawriter oac 4101 8 01 effective until 7 1 2019 roof ceiling credit to. The dimensions of the joist depend on the span as well as the load its intended to bear.
Ceiling joist spans for southern yellow pine douglas fir and eastern spruce joist span tables use these tables to determine lengths sizes and spacing of ceiling joists.
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