FLOWER MOUND

Flower Mound sits on the Eastern Cross Timbers, the north-south band of sandier ground that runs through this part of Denton County, and that makes it behave differently from the Blackland clay east of here. Sand drains, clay swells, and a good many Flower Mound lots have both within the footprint of one house.

A slab bridging that change sits on two soils that respond to the same rainfall in opposite ways. The town also grew across rolling terrain that had to be cut and filled before anyone could build, which puts another seam under some of these houses.

What the ground under Flower Mound is actually doing

Flower Mound has the widest spread of any city we work in. Gasil, the most common soil here, is sandy — 13.7% clay and a linear extensibility of 0.9, which is as close to inert as soil gets. But Heiden sits under another 8.6% of the town at 14.1, the highest reading in our whole service area.

That is a fifteen-fold difference in how much the ground moves, inside one town. It is why the Cross Timbers boundary matters so much here, and why a Flower Mound diagnosis that does not establish which side of it your house is on is not really a diagnosis.