footing detail gone wrong ??
footing detail gone wrong ??
(OP)
Am inspector on this job that has a number of 8'x'8 isolated column footings with 9#5 T&B EW. In the detail the top mat of column footing rebar is at the same elevation as the rebar in the SOG. The weather proved to be too difficult for the monolithic placement so the bottom half of the footings were placed and then the SOG was placed. The slab-on-grade rebar is specified as #4 at 16" EW so the contractor switched to #5 @ 16" EW and didn't place anything extra at the columns.
problems:
1. I say he's short 2#5 EW at each column. Is my math incorrect?
2. He placed the SOG construction joint 1-foot from a column line and placed 2' long x 1" dia. smooth dowels through the CJ. So the top mat of rebar specified for the columns along this grid line is discontinuous at this CJ. He says it's OK because the smooth dowels lap it out???
Now I have not asked the EOR about that yet yet, but is there any way that could be right?
Thanks.
problems:
1. I say he's short 2#5 EW at each column. Is my math incorrect?
2. He placed the SOG construction joint 1-foot from a column line and placed 2' long x 1" dia. smooth dowels through the CJ. So the top mat of rebar specified for the columns along this grid line is discontinuous at this CJ. He says it's OK because the smooth dowels lap it out???
Now I have not asked the EOR about that yet yet, but is there any way that could be right?
Thanks.






RE: footing detail gone wrong ??
RE: footing detail gone wrong ??
I would be concerned about a cold joint between the bottom of footing and the slab even without the construction joint in the slab. I would certainly be concerned about a construction joint placed in the slab above the lower portion of the footing if they were intended to act as a monolithic unit. It would have been much better to pour the footing full depth below the slab with the specified reinforcement, then to pour the slab over it.
Two foot long smooth dowels don't "lap it out". They are intended to slip so that the control joint can function properly.
By all means, express your concerns to the EOR. He will likely reject the work.
BA
RE: footing detail gone wrong ??
RE: footing detail gone wrong ??
1: the footing was detailed as a thickened section of the slab
2: apparently he got permission for the non-monolithic placement
3: my bad on the rebar: 9#6 bot & 9#5 top
I'll call the EOR tomorrow. Those steel guys are fast; they have red iron at every one of those footing locations.
RE: footing detail gone wrong ??
RE: footing detail gone wrong ??
RE: footing detail gone wrong ??
RE: footing detail gone wrong ??