Securing new foundation to old

Looking for professional advice and method of securing a new concrete foundation to an existing brick foundation. The configuration is simply a perpendicular or tee condition. The new concrete wall will probably be 8"-10" and the old brick is just a double brick wall. Also, what extent of rebar is needed for a typical concrete house foundation of approximately 30'x40'?
Any advice is greatly appreciated, thanks in advance, KG
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snipped-for-privacy@hotmail.com wrote:

you really need to provide more information to answer this. typically, you would drill and epoxy rebar dowels into the existing foundation to which you would tie the rebar of the new foundation. the amount of rebar depends on a lot of things like the amount of weight the foundation will support, soil conditions, seismic activity, etc. if you are in an area subject to plan review and inspection, call your building department to find out what their needs are--they may require you to hire an engineer. if you are in a "non-coded" area, i'd call some local builders and find out what standard practices are in your area. If you are using ICF's, they will often have rebar schedules you can use. someone will undoubtably post on this thread that you should hire an engineer. there is some merit in that...if you got to ask how to tie a new foundation into an old on usenet, then you maybe should just hire a mason.
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I assume you mean to say footing. I have not ever seen a brick footing.
If you mean that there is a brick wall/stem/foundation wall sitting on a concrete footing, then I would assume you would be matching the existing footing. Check with your code authority, but 2 #5 bars would be a minimum in the footing here. A concrete stem wall would probably like an additional 2 #4.
Here is some fair information: http://www.mcvicker.com/resguide/page008.htm#FAF
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DanG
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It happened a lot before 1930.
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MichaelB
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