Residential Foundation Repair Burnet, TX.

Burnet sits squarely on the Llano Uplift, where ancient granite and Cambrian limestone push close to the surface. That single geologic fact shapes nearly every foundation problem we see in town. Instead of the deep, uniform clay that swallows slabs east of the Balcones Escarpment, a Burnet home often rests on a thin, rocky overburden whose depth changes by the foot, decomposed granite that drains like coarse sand in one spot, a shallow caliche lens in another, and a solution-widened joint in the limestone right beside it.

The practical result is uneven bearing: one corner of a slab can sit on competent rock while the opposite corner spans several feet of loose granular fill with no solid contact at all. When a foundation starts to crack, drag, or slope here, it is almost never the whole house sinking evenly. It is one zone giving way over a soft pocket. Fixing it well starts with finding exactly where those pockets are.

Why a thin, rocky lot still moves

Plenty of Burnet homeowners assume well-draining granite soils make their foundation bulletproof. It's a reasonable guess, and it's wrong often enough to cost people real money. Even shallow rocky ground hides fine-grained troublemakers: residual clay weathered out of the feldspar in granite, and montmorillonite-bearing seams trapped down in limestone joints. Those pockets shrink in a dry Hill Country summer and swell after a heavy rain, same shrink-swell cycle as the clay belt, just concentrated in small, scattered zones.

Over the years that shows up as differential movement: doors that stick in July and swing free by November, drywall cracks that open and close with the seasons, and permanent elevation loss where bearing material has eroded into subsurface voids. Because the limestone underneath is fractured and solution-weathered, support can change inside a single footprint, so the damage tends to cluster at one corner or along one beam line instead of spreading across the slab.

Two things make it worse, and both are fixable. Water pooling against the perimeter beam saturates those soft pockets and washes them into voids, which is why we so often pair a repair with proper drainage correction. And widening solution channels in the limestone can pull a beam down over time, controlling where surface water goes matters as much in Burnet as the piers themselves.

What we look for on a Burnet inspection

The signs here are a little different from the clay-country playbook, so we check for the patterns rocky ground actually produces:

• Diagonal and stair-step cracks running from window corners or through brick mortar, the signature of localized differential settlement, not uniform sinking.
• Grout cracking and tile lippage on interior floors, which over a rocky subgrade often shows up before any exterior crack does.
• Perimeter grade, we want it falling at least six inches over the first ten feet so water leaves the beam instead of soaking the soil pockets beneath it.
• Watering habits, supplemental soaker hoses should sit back at least eighteen inches from the beam so you're not feeding water straight into limestone joints.
• Doors and windows that drag, won't latch, or have been planed down to cope with seasonal movement.
• Slab and garage-floor cracks that line up with the low zones the elevation survey flags.

Questions Burnet homeowners ask us