I am pouring a garage foundation 8" thick, 7' deep. Building is 28'X13'?
2 The footer is 3' deep. Do I need a perimeter drain, or will positive grading be sufficient?
Answer:
First, let me say you are taking on a huge project from the perspective of pouring a concrete wall that tall. I would recommend that you use steel wire as a tie-off inserting it through the forms, and then clamping it on either side with a substantial clamp (nuts and bolts preferred). Use many of them in this case and densify them. I understand that you know what you are doing, I agree with you there. Make sure you have rebar in the forms if you are pouring in lifts (at least some rebar going all the way up the form).
I would make the forms super heavy and over-reinforced. To answer your primary question, I would pour about half-way up, then wait about an hour, or one hour and a half, then pour the rest. This insures that you have adequate bonding between the lifts. This insures stability, and prevents water/moisture leaking from the seam between the lifts.
Also, get some more advice to make sure there is a consensus on this subject.
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