Adding footings to an existing slab

You could certainly dowel in a pedestal on top of a 6in slab for light columns etc…depending on what kind of loads you have it’s difficult to assume that they 6in slab would actually take the load.

Is it a red iron style or the carolina carport style.

I did carolina carport and ran into something similar. I had to get the drawings from carolina carport showing that footings arent required to support their buildings the way the load is distributed.

The red iron style i believe need footings.

Not sure about the code and what not but look into drilling piers underneath existing slab.

This one is tricky, could a cable lock help? Do you need a permit? Too many questions.

That requirement doesn't necessarily have to do with supporting the building. Up north the purpose is to get deep enough for the freeze/thaw line and down here it is about preventing washout. Is the slab on an elevated pad?

Eta
Is the building installed yet?

A 12" square shovel beam around the perimeter only weighs about 100 pounds per linear foot. You need more meat than that if you're trying to resist uplift. We sometimes use them to support light loads but completely ignore that weight when considering uplift.

Speaking of metal buildings, did you hear about that collapse on Burbank?

eta: Just remembered he said a 6" slab so the beam would be more like 85 plf.

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24x24 is standard

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I assumed we weren't talking about grade beans since the slab is already in place. You can undermine and install a shovel without demoing the existing. I'm really curious about the other poster who got a letter from Carolina stating a mat is sufficient.