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Old 12-19-2018, 07:07 PM   #1
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Rebar placement in square footing for post


Hey all. I am adding some supports in my basement/crawlspace in preparation for an attic conversion project upstairs. The engineer is having me add four posts (either PT 6x6 or permanent steel columns - my choice) with 24x24x10 footings. This will be inspected, so what does code call for in terms of rebar placement? My plan was just to use 4 18-inch pieces of 1/2-inch rebar per footing, laid out in a tic-tac-toe grid pattern held up by 4 rebar chairs where the pieces cross. That seems like it would be sufficient, but I can't figure out if there's a specific code requirement for this. Most of what I find online is for continuous footings.

I am in North Carolina. The frost depth is 12", so I am just making the footings 24x24x12 so they'll be level with grade.

Thanks for the help.
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Old 12-19-2018, 08:10 PM   #2
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Re: Rebar placement in square footing for post


Lift the forms off the ground a little, up to 2" so the depth will still be deep enough and the bottom of the post is out of the dirt. Engineers tell us the size of the footing and the rebar specks I would do a grid of 3 or 4 each way 20" long would be 2" from the edges and 2" off the ground is right. We just hang them from the top with wires, but chairs will work.
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Old 12-19-2018, 08:22 PM   #3
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Re: Rebar placement in square footing for post


Thanks, Neal. I think I've gotten half my advice from this site from you alone. Much appreciated.
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Old 12-20-2018, 03:13 PM   #4
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Re: Rebar placement in square footing for post


Quote:
Originally Posted by eholmes77 View Post
Thanks, Neal. I think I've gotten half my advice from this site from you alone. Much appreciated.







Yes, Nealtw has an abundance of knowledge. HOG !!!!!!!! lol






just sayin'
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Old 12-25-2018, 09:15 AM   #5
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Re: Rebar placement in square footing for post


here its 2 mats of #4 bar ea 20" long - 3pcs,,, 1st mat 3" off bottom & 2nd mat 3" below top,,, ea mat at 90* to ea other ( btm mat front to back & 2nd side to side ),,, ours are 2.0 x 2.0 x 1.0 high
iirc, steel has to be conc filled per fire code
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