Can I do this with old footings/piers?

[sloph]

Have an old house with corbelled brick footings and piers. We are adding a camelback/addition which about 10ft of the camelback will sit on top of old existing structure with rest to be on new construction and foundation. Was told I could add additional single footings under existing structure to accept the weight of the new camelback.
I had some ideas.
1) Can I excavate around the existing corbelled single footings and jacket them with concrete? The new jacket dimensions would be 30"x30"x16" depth with proper amount of rebar. OR
2) Can I excavate and form a continuous 10ft footing and incorporate the existing brick footings?

The existing footings are 8" wide and reach a max length of 20" at about 16" depth. The new continuous footing would be 30" wide and 16" deep by 10-12FT.

Thanks,
Jeff

 

[phamENG]

I wouldn't want to jacket them in concrete. Shoring up the building, removing the existing piers, and installing a new foundation is going to be challenging and more expensive but will likely give you a better end product.

 

[sloph]

Way more expensive. Since this section is carrying about 12 feet or 10% of the new camelback I'm not looking to do the entire house. The front section has 10x10 sills that are still in good shape as well as the piers so do not want to disturb that.

 

[chicopee]

If you live near the Amherst- Hatfield area of Massachusetts, I could check my archive for the name of a contractor that has experience with the type of work you described. It is always best to solicit ideas from people of similar mindset when you are in doubt.