Wednesday afternoon and Thursday Davido and his his Ian started backfilling and compacting the inside of the foundations by hand and on Friday the excavator showed up to help us back-fill with the machines. Usually the dirt just gets pushed back in without compacting, which can lead to settling later. Since our concrete slab is also the finished floor, settling would be unacceptable. Therefore, we have been compacting the soil as we go. The dirt is pushed back in in 12 to 18 inch lifts and then we compact it before more dirt is pushed in. The compactors are essentially jack-hammers with a large plate on the bottom to tamp the soil. This is very jarring work and after a couple of days of this everything shakes when I close my eyes.
The level of dirt is still a little high on the inside, so on Monday the excavator will take that out, put in the 4 inches of gravel that goes under the slab and finish filling and grading outside the foundation. We are scheduled to pour the slab on Friday. Before that the rough plumbing will need to be done and the tubing for the radiant flooring will need to go in. This should all get under way on Monday as well.