Rebar detail for step footing
Last Post 08 Jul 2014 09:14 AM by ICFHybrid. 4 Replies.
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timberwolf78User is Offline
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07 Jul 2014 08:06 PM
I have a 32"(equals 2 icf blocks) step up from the basement frost wall which happens to be right at a 90 degree corner.(see attached sketch) The footings are 20" wide and the ICF is 11"(6" core). Footings will have 2 #4 horizontal rebar. I am trying to figure out how to do rebar in the stepup area. I have researched but am unable to find any details. Any input will be greatly appreciated.
jonrUser is Offline
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07 Jul 2014 08:39 PM
Only a guess, but perhaps a solid 20x20x32 block of concrete with rebar bent to form continuous pieces from one footing to the other (plus overlap).
ICFHybridUser is Offline
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07 Jul 2014 11:15 PM
I have researched but am unable to find any details. Any input will be greatly appreciated.
Google 'stepped footing rebar detail' and look at the resulting images.
timberwolf78User is Offline
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08 Jul 2014 12:10 AM
Jonr,

That's what I am thinking too if I am not able to find any alternative detail.

ICF,
I posted here after researching for a couple days. I didn't find any details for a situation similar to mine. Once again it's a step up and a 90 degree bend at the same spot.
ICFHybridUser is Offline
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08 Jul 2014 09:14 AM
The biggest mistake you can make is by not having the necessary overlap on the bar. You don't have to go in for any fancy 3-dimensional bends, but you do need to have embedded bar with the necessary overlap in all dimensions. And that will necessitate forming the concrete in such a way as to make sure the bar is completely encased, whatever you do. The only reason I mention that is that I have seen bar leaving concrete and going through dirt before going back into concrete. You don't want that.

Also, in case you are going seismic, stepped footings get a lot of extra strength from having angled bar that completely transitions all levels. Not so much an issue with a 90 degree corner, which has other things going for it.
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