Building an ICF house with a full basement. Footings are 24″ wide and 12″ deep. Excavator dug down an extra 12″ around the perimeter so we wouldn’t have to dig out the footings.
We are using 6″ Form-a-Drain for the footing forms. What do we do about the 6″ gap under the Form-a-Drain?
Options we’ve thought of:
a) On the exterior, we figure we can shovel in dirt to the bottom of the Form-a-Drain, then pea gravel above that. We’re afraid to do the same thing on the inside because of compaction and subsequent cracking of our basement floor.
b) Could use more pea gravel, but are afraid we’d have trouble keeping the pea gravel where it belongs and the concrete from pushing it out.
c) Considered putting the Form-a-Drain on the bottom and 2x6s on top, then pulling the 2x6s off.
d) Putting 2x6s underneath the Form-a-Drain, then pulling them off after the pour.
Comments on the above? Other suggestions?
Thanks, in advance.