Key takeaways
- Clay holds water and swells and shrinks.
- Freeze-thaw cycles push on weak bases.
- Compacted stone and drainage let hardscape ride it out.
- Frost depth rules affect footings and walls.
What the ground does
Clay soils soak up water, swell when wet and shrink when dry. Add winter freezes and thaws, and the ground moves more than it seems. Surfaces on thin or poorly drained bases rise, sink and shift.
How construction handles it
A compacted stone base drains and does not swell like clay. Geotextile fabric keeps clay from migrating into the base. Edge restraint holds the surface together. Good drainage keeps water from pooling in the base layers.
Footings and frost
Frost depth in Middle Tennessee is commonly about twelve inches, though local codes decide. Pillars, steps and structures that must not move need footings below that depth.
Related services
Quick answers
Do I need geotextile fabric?
In clay-heavy or soft soils it is a good idea, separating soil from base stone. We decide on site after checking the ground.
Why does my patio heave in winter?
Water in the base freezing and thawing is a common cause. Better drainage and a compacted stone base help.
Ready to talk it through? Get a free estimate or call 615-431-3789.