I'm sure the footings have to extend to solid/stable soil
KHONDAHM wrote:One really only need put the foundations into the "old" already compacted soil, build the first floor beams elevated on that, then backfill and compact. Since your floors would be on your beams, you'd be good to go. No need to wait any seasons that way.
Pouring a slab on top of a one or two season compacted fill and building up a house on it is like stepping on a sponge. That dirt is going to shift - especially if water gets under it the first rainy season after it is built. If you are building it on clay, build it to "float" or else when the clay swells, the house could tilt causing walls to crack. Examples can be seen all over...
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