When the builders began to dig for the foundation, they discovered that it was backfilled with unsuitable material — old trees, bricks, pieces of the old foundation. They removed it all and replaced with recycled crushed concrete, a suitable sub-foundation for the house’s foundation. All that other material is prone to decay and rot, which leads to an unstable sub-foundation.
The builders saved a few artifacts for me — two vintage glass cups, original bricks stamped with the brick factory’s name, and pics of a hand dug well they uncovered under the ground.
After a week of excavation, preparation of the sub-foundation (which is 14′ of compacted crushed concrete!), and installation of the water/sewer lines, the actual foundation for the house arrived. It is pre-cast and installed on-site in one day. After watching how quickly and easily it goes up, I can’t fathom why most builders don’t use this type of foundation. Plus, it’s a great foundation system (see details in my post The Basement Foundation).
The pre-cast panels arrive on a trailer. They’re hoisted and placed in position by a crane. The crew is on-ground to receive the panel and lift into place. Once in place, they adjoin it to the adjacent panel and seal all seams so it’s airtight.