There are different types of ground movement. The most common type is in
areas with expansive clay soils and those are relatively straightforward
to deal with since it doesn't generally involve sideways shifting or
undermining. The issue is uneven expansion and contraction of the soil
due to uneven moisture content, i.e. the perimeter near where the ground
is exposed to the air dries faster and thus shrinks faster leaving the
perimeter of the house to drop relative to the interior. The deeper you
install the piers the more stable the soil moisture and therefore the
more stable the soil the pier rests on.
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