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I have another related question regarding callouts. If a mat footing leader says 24 #4 bars EW, T&B, does that typically mean there are 24 total bars (6 bars bottom, 6 bars top, each way), or does that typically mean 24 bars bottom, 24 bars top, each way totaling 96 bars? I understand this may...

Thanks everyone. That was very helpful. The link was helpful too.

Thanks. I typically will specify the number or bars (i.e. 4#4) since I am unsure how the OC spacing will be interpreted, and our pads are typically small. However, with something larger, say 10', I was advised by a structural engineer that contractors like OC spacing specified so they can...

I have elementary questions about rebar on center spacing specified on drawings. If I have a new 10' x 2.5' x 1' height slab and have determined I need a 13#4 longitudinal bars and 4#4 transverse bars per temperature and shrinkage, how do I specify this on drawings? Would I specify #4 at 9" on...

Very helpful information. Thanks.

Thanks for your input about it being a net bearing capacity. That helps a lot. I haven't had a geotechnical engineer's input, but will use the worst soil of 1,500psf. If it passes the bearing check at this pressure, should it be ok to use 1,500 without input from a geotechnical engineer?

Is it typically needed for something like a shallow foundation? That is the closest thing I can compare it to.

We want to design an underground support similar to a combined footing for a heavy underground asset. It will all be underground and filled and compacted at the end. We would not be using geotech reports and will be using the presumptive values given by IBC 1806.2 (1500psf). When performing a...