Re: Underpinning Foundation
Your best bet is to continue talking to your contractor. Generally, it seems to me that you'd want to carefully remove sections of the rubble foundation, and replace them with poured concrete, but the people onsite who can actually see the condition of your foundation are going to be able to comment on the proper way to replace it or shore it up. Even pictures of your foundation aren't really going to help, it takes a hands-on physical look at it to see what can be done to replace it without risking damage to the house. They may recommend replacing the entire rubble foundation, or they may note that they can patch in properly supported concrete in specific areas (with clay soil, this may take some really deep digging to get a good base for the concrete).