We spent the second half of the week backfilling. We have to do this incrementally to avoid overstressing the concrete stem walls. It is a long and difficult process - fill, compact, repeat.
The massive amount of fill in the foundation acts as a thermal mass; if done right, it will give sustained heat to the house in cold weather (and vice versa). It's the same principle as a rammed earth wall, only in the vertical direction.
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