The Nashville Dome is in your backyard.
Most of Middle Tennessee sits on an ancient uplift of limestone geologists call the Nashville Dome. Over it lies red clay, sometimes deep, often thin. It explains most of what happens in your yard.
Shallow rock
In parts of Davidson, Williamson and Rutherford counties the limestone is close enough to the surface that it outcrops in yards and road cuts. Some areas have very shallow, flaggy soils over the rock; the cedar glades east of Nashville are the extreme version of it. Elsewhere there’s several feet of clay first. We find out with a probe before designing anything.
Clay that moves
Clay holds water, which is why yards stay soggy after spring storms. When it dries, it shrinks and cracks. That swing is what heaves patios, tilts walls and drowns plants in March that were fine in October.
Sinkholes
Limestone dissolves slowly, and in some parts of Middle Tennessee that leaves sinkholes, open or hidden under soil. A low spot that holds water or keeps settling deserves a careful look before anything heavy goes on it.
What we do about it
- Probe the soil and note rock depth before design.
- Build patio and wall bases deep, compacted and drained.
- Grade the yard to move water away from the house and the hardscape.
- Amend planting beds and choose plants that tolerate wet springs and dry summers.
Curious what’s under yours?
The design-build landscape site, built in seven days.
Seventeen pages: a cross-section of what’s under a Nashville yard, a design-build process with the fees stated, an investment guide with real ranges, and both Tennessee licenses shown.