floor joist spacing
floor joist spacing
(OP)
hello all,
I'm preparing plans for a 2 story + basement house and had a question on the floor joists for the first floor. I have specified 2x12 @ 24" OC SPF #2. the loading is 50psf LL + 10 psf DL. the joists work for l/360 deflection and are close on allowable stress. the house width is 28' with a center beam so the design span is slightly < 14'. the house is in NY. My question is will 24" spacing be ok for hardwood flooring, a local contractor recommended 16" spacing to make sure there is no problems with whatever flooring system the owner decides on using. thanks....
I'm preparing plans for a 2 story + basement house and had a question on the floor joists for the first floor. I have specified 2x12 @ 24" OC SPF #2. the loading is 50psf LL + 10 psf DL. the joists work for l/360 deflection and are close on allowable stress. the house width is 28' with a center beam so the design span is slightly < 14'. the house is in NY. My question is will 24" spacing be ok for hardwood flooring, a local contractor recommended 16" spacing to make sure there is no problems with whatever flooring system the owner decides on using. thanks....






RE: floor joist spacing
RE: floor joist spacing
RE: floor joist spacing
RE: floor joist spacing
I would stick with 16 inch spacing as stated by others.
Also, I would expect for 14 ft spans, 2x10's wouldat 16 would satisfy most performance requirements (especially if #1 S pine of D fir. #2 might also work. L/480 live load requirement is a common standard for good performance. Ther eis much written about this in some of the engineered wood joist producer's sites.
RE: floor joist spacing
RE: floor joist spacing
RE: floor joist spacing
RE: floor joist spacing
If you are supporting a tile or stone finish, agree with above posts that 16" is best, particularly if you don't know exactly what the finish is going to be yet.
RE: floor joist spacing
RE: floor joist spacing
then go to publications, then technical papers. Cheers
RE: floor joist spacing
Another consideration beyond what is structural would be that extra room for ductwork if joists are spaced at 24".
Hope it helps.
Rarebug