Drainage Correction & French Drains in New Braunfels, TX

New Braunfels Foundation Repair HQ has been correcting drainage around New Braunfels, Texas homes for over 18 years, because on our clay, managing water is half of foundation repair. Drainage correction is the set of fixes that keep rainwater and roof runoff out of the soil that carries your house: French drains that intercept water below the surface, regraded soil that sends runoff away from the slab, gutter and downspout extensions that discharge well clear of the perimeter, and root barriers that stop thirsty trees from drying the clay on one side of the home. Hold the moisture in that soil steady and the expansive clay under the foundation stops swinging between swollen and shrunken, which is what moves foundations here in the first place.

The trouble under New Braunfels homes is the expansive clay that runs along the Balcones Fault at the edge of the Hill Country. That clay behaves like a sponge. In a wet spell it takes on water and swells, lifting whatever sits on it; in a Central Texas drought it bakes, shrinks, and lets the foundation drop. A slab does not crack because the concrete failed, it cracks because the soil under one part of it changed volume while the soil under another part did not. Your foundation is only as steady as the moisture in the first several feet of ground around it, and drainage correction is how we hold that moisture steady.

A French drain is the workhorse of the system. Our crew trenches along the wet side of the home, lines the trench with filter fabric, sets perforated pipe on a gravel bed with continuous fall, and backfills with washed gravel. Water moving through the soil drops into the gravel, enters the pipe, and is carried to a discharge point downslope, so the clay beside the footing never saturates. The drain works silently, below grade, every time it rains.

Surface water needs the same discipline. We regrade so the ground falls away from the slab for the first several feet, cut swales where a neighbouring lot sheds onto yours, and bury downspout extensions so roof runoff releases 5 to 10 feet from the wall instead of at it. Where a mature live oak or elm sits close to a settling corner, a root barrier trench keeps the roots from mining moisture out of the clay under the footing, because a big tree in August can dry one side of a foundation as effectively as any drought.

This is also what protects a structural repair after we finish it. Piers carry the house down past the active clay, but the flatwork, the beds, and any unpiered sections of slab still ride on surface soil. If the lot keeps soaking one side, that soil keeps moving, which is why we design drainage alongside pier work under a settling slab rather than after it. The same water is usually behind a bowed or leaning retaining wall and behind the standing moisture that leaves a crawl space damp and musty. Drainage is often the least expensive line on a foundation scope, and it is the line that protects every other one.