We are considering adding on to our present house; 2 story, daylight basement. We would add onto the daylight side, essentially expanding what we have horizontally. The new building will have its own footers and foundation wall. How do I tie it to the old building's footer and foundation wall? I am envisioning drilling holes every X" in the old footer and foundation wall, "gluing" in rebar that sticks out Y", then encasing all of said rebar in concrete when we pour the new building's foundation system. OR, we could just build the new building 4' from the old one, have a walk-way on the second floor that allows travel back and forth, and then tie the roofs together. Surely this has been done 10,006 times and somebody knows what works, what caveats to watch for, etc. Anybody here know this? All the ground that the new building will sit on is undisturbed, pre-historic dirt that has been driven on for 30 yrs. Thanks. john