What a Lot Needs Before Construction
Before any concrete is poured, a lot needs all topsoil and organic material removed from under the building, a firm subgrade and properly compacted fill. Miss one of those and the building sits on ground that keeps moving for years.
Topsoil and buried roots decompose and compress over time. A slab or footing poured on top can drop 25 to 50 mm (1 to 2 in) unevenly, which shows up as cracked floors, sticking doors and gaps along the trim.
Poor compaction causes the same damage more slowly. Loose fill dumped in one thick layer settles every time rain soaks it, dragging the ground beside the foundation down until it tilts toward the house.
That reverse slope is how many wet basements begin. We rough grade every pad to shed water from day one, which gives the finished lot grading a sound starting point.
Soft spots get fixed, not buried. We proof-roll the stripped subgrade with a loaded machine, and any wet clay pocket that pumps or ruts is dug out and replaced with compacted Granular B, sometimes over a geotextile separator.