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tothebrit 05-07-2010 03:56 PM

floor joists
i am putting in a 2nd story room above the garage, what size should the joist be & what centers should they be at, the total span is 30ft with a header across at 13 ft from one side so the span is 13.2ft & 16.8ft that meet at the header. thanks for any help, the brit

Yoyizit 05-07-2010 06:32 PM

How bouncy do you want this floor at what live & dead load?
L/180, L/360?

Gary in WA 05-07-2010 08:13 PM

Be safe, Gary

tothebrit 05-07-2010 10:00 PM

Thanks for the reply, i put in the floor above the house living space, 7 that was 2x8's. not sure of the support under (supporting walls etc.). floor i put in 3/4 ply, seems to be firm with no bounce. but this has 2x6 with 3ft spacing. i Put in the header, 8X12x22 with 4x4 supports 5ft apart.

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