Boerne, Texas: what the ground under the city is like
Boerne sits in Kendall County, on edwards plateau and balcones. The soil mapped here is predominantly classified well drained — and that classification, not the rainfall total, is what decides how a slab foundation behaves.
Linear extensibility 4.5% — moderate.
11% of the mapped soil area around Boerne is wet enough that the USDA describes it as needing artificial drainage.
Shallowest annual water table around 155 cm (5.1 ft).
Values are for Kendall County, which is what the soil survey resolves to. Full county report · soil map for a specific address.
The ground under Boerne
Edwards Plateau and Balcones. Thin stony residuum over Cretaceous limestone, karst, caves and springs
Rock close to the surface, so footings often bear directly on limestone — which does not move. The problem here is the opposite one: karst. Water moves through fissures in concentrated routes, and slabs poured over infilled solution features settle unevenly.
When it shows up here
| Slab moisture | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Ground movement | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
The mechanism here is the wet–dry cycle, and it peaks in the summer drought: clay shrinks hard from June to September, then the first heavy rain swells it back. Foundation cracks tend to appear at the ends of that swing, not during it.
Climate pattern for this physiographic region, not a forecast for your house and not from the soil survey. It answers a question homeowners actually ask: when does this show up.
What repairs cost in Texas
| Reference job | Modelled range |
|---|---|
| Slab foundation lifted and stabilised on 12 piers | $16,900–$36,100 |
| Two slab cracks injected + regrading around the perimeter | $1,900–$6,300 |
| Engineer's report plus buried downspout discharge | $1,200–$4,150 |
Regional factor for TX: ×0.94. Full cost breakdown for Texas · run your own dimensions.
ZIP codes in Boerne
78006, 78015
Soil does not stop at a city boundary, and neither does this data — every ZIP code above resolves to the same county soil survey. For the individual survey polygons around one address, use the soil map.
Questions about Boerne
Is the soil the same everywhere in Boerne?
No. These values describe Kendall County as a whole, which is the unit the soil survey publishes. Within a city, map units change over a few hundred metres — the soil map draws the actual polygons around a point and is the honest answer for one address.
Which contractor should I call in Boerne?
We do not rank or recommend individual firms and we are not one. What this page is for is knowing which kind of work the ground here points to before anyone quotes you, and which claim to check. If you want quotes, the form below passes your request to the named networks.
Does this replace an inspection?
No. It tells you what the ground is; an inspection tells you what your building is doing on it. The useful order is: read this, print the brief for your county, then have someone look.
Get quotes in Boerne
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