Two story slab on grade foundation footing in California
I just looked all over the internet for a detail for a two-story slab on grade footing. I was wondering if anyone had called out #4 rebar instead of #5.
I am a building designer and always have to listen to my engineer. He calls out 2-#4 rebar top and bottom, 4 rows total, in my 12″ wide x 12″ into grade one story footings. He calls out #5 in my two-story footings.
But I was curious if I could use #4 rebar in a 15″ wide x 18″ into grade two-story footing.
Well, I didn’t find anything. No detail or thread that explicitly discussed this. Then a contractor called and I asked him. He said he has always seen 2-#5 T&B.
I thought I would post this to see if anyone had any comments on the matter. Also, if anyone asks this question in the future, maybe they will find this thread.
Thanks
Replies
The engineer says # 5; the contractor says this is standard practice; you have a contractor so you are probably not doing the work yourself. Why are you even asking?
This is really a question for your engineer.
trade-offs between dimensions of steel and concrete are not a simple matter.
In California, the performance during earthquakes is of concern.
Is there an economic impact you are concerned about?