Drainage and Grading Correction in Gregg County

Water is the mechanism here

Foundation movement in Gregg County is fundamentally a moisture story. Roughly 48 to 50 inches of rain fall on Longview in an average year, distributed across all twelve months with the heaviest concentration in spring. Then the region turns hot and comparatively dry through August and September.

Under a typical house, the top layer is sand — the Darco and Lilbert soils are deep sandy units — and beneath it is a firm clay subsoil in the Sacul, Kirvin, Cuthbert or Bowie series. The Sacul series in particular is described as slowly permeable with a very firm red clay beginning near the surface.

So rainfall passes quickly through the sand, meets the clay and stops. From there it travels sideways along the top of the clay layer. If it collects under one side of the house, that side's subgrade swells. When the dry season arrives, that side gives up more volume than the other side. Differential movement follows, and differential movement is what cracks a foundation.

Control where the water goes and you control most of the movement.

What goes wrong on typical lots

Downspouts discharging at the foundation

A single downspout can concentrate a very large volume of roof water into a few square feet of soil. Dumped at a corner, it saturates precisely the spot that most needs to stay stable. This is the most common defect found, and among the cheapest to correct.

Negative or flat grade

Soil should fall away from the house for the first several feet. Over years, settling, mulch buildup and landscaping reverse it. Once the grade tips toward the house, every rain delivers water to the slab edge.

Flower beds acting as reservoirs

A bed edged with timbers or stone against the house, filled with loose amended soil, holds water against the foundation long after the surrounding yard has drained. Attractive and quietly destructive.

Sheet flow off a slope

Much of Gregg County rolls. On a sloped lot, water arriving from uphill has to go somewhere, and without a diversion it goes against the uphill wall of the house.

Perched water with no outlet

Because the clay layer blocks downward drainage, some lots hold shallow subsurface water with nowhere to go. The surface looks dry while the soil eight inches down is saturated.

The correction work

• Regrading the perimeter. Re-establish positive fall away from the structure across the first several feet using soil that will hold that shape rather than loose organic fill.
• Downspout extensions. Carry roof water well away from the foundation, either above ground or buried to a pop-up emitter at a lower point on the lot.
• Swales. A shallow shaped channel that intercepts uphill sheet flow and routes it around the house. Once grassed it is nearly invisible.
• Bed reconstruction. Rebuilding planting beds so they drain rather than pond, with the soil surface below the slab line.
• Catch basins and surface inlets. For persistent low spots that will not regrade out.
• Root barriers. Where a large pine or hardwood close to the slab is drawing moisture out of the subgrade during dry stretches.

A simple check you can do yourself

Go outside during the next real rain and walk the perimeter with an umbrella. Watch where roof water lands. Watch which direction the yard sheds. Then come back two days after the rain stops and find the places that are still soft. Those spots are where the perched water is sitting, and they will correlate with where the house is moving more often than not.

How much fall, and what to build it out of

The working guideline used across the industry is that soil should drop roughly six inches over the first ten feet out from the foundation. That is a target rather than a rule, and on a tight lot it is not always achievable, in which case a surface drain or a swale substitutes for the fall you cannot get.

What the grade is built from matters as much as its shape, and this is where a lot of well-intentioned regrading fails in East Texas. Loose sandy topsoil or bagged garden mix placed against a foundation looks correct on the day it is finished and then behaves like a funnel. Water enters it readily, travels down through it, reaches the less permeable material below and pools right at the foundation — the same perched-water mechanism that operates on the larger scale across the whole lot, reproduced in miniature against your slab.

The material against the house should be a heavier, tighter soil that sheds water rather than absorbing it, shaped and compacted to hold the slope. Decorative material and planting mix go outside that band, not against the wall.

Gutters: capacity, not just presence

Most houses here have gutters. Far fewer have gutters that keep up with an East Texas downpour.

A roof with a large tributary area draining into a single downspout will overflow during a heavy spring storm regardless of how clean the gutter is, and the overflow lands in exactly one spot along the foundation. The symptom is a gutter that appears fine most of the year and sheets over the front edge during the storms that actually matter.

Worth checking: whether the number of downspouts is proportional to the roof area feeding them, whether the gutter is pitched consistently toward them, whether debris from surrounding pines is blocking the outlets, and where each downspout actually terminates. Pine needles are a specific local nuisance and they mat into a dense layer that water will not pass through.

An extension carrying water six to ten feet from the wall is the baseline. On a lot that falls toward the house, buried piping to a pop-up emitter at a lower point is the better answer.

Irrigation is a foundation system whether you meant it to be or not

A sprinkler system puts water into the soil around your foundation on a schedule you control, which makes it either the most useful tool you have or a significant liability.

The liability version is a head spraying directly against the slab, or a zone that runs long enough to saturate one bed while the opposite side of the house stays dry. That produces the same differential moisture condition that rainfall produces, except year round and on a timer.

The useful version is deliberate. During an extended dry stretch — and late summer here is reliably dry relative to spring — the soil around a foundation shrinks. Applying a modest, even amount of water around the entire perimeter slows that shrinkage and reduces the seasonal swing. The principles are consistency and evenness: light and frequent beats heavy and occasional, all sides get the same treatment, and water goes into the soil a foot or two out rather than directly against the concrete.

Check your heads and your zone times before assuming the system is neutral. A misaligned head running three times a week for years is a real cause of localized movement.

Trees: barriers before removal

Loblolly and shortleaf pine dominate this region and they grow close to houses. A mature tree draws a substantial volume of water from the soil through the growing season, and during a dry spell it will draw from wherever the moisture remains — which can be the subgrade under your slab.

Removal is the blunt instrument and it is not always right. Taking out a large tree that has been drying the soil for thirty years allows that soil to rehydrate and swell, which can cause its own movement. It also removes shade, which changes evaporation across the whole lot.

A root barrier — a vertical impermeable panel installed in a trench between the tree and the foundation, deep enough to intercept the root zone — addresses the moisture competition while leaving the tree. Combined with supplemental watering on that side during dry stretches, it is usually the better first move. Removal is worth considering when the tree is already in poor condition or genuinely too close to be managed.

Verifying the work

Drainage is unusual among foundation services in that you can check it yourself, for free, without any specialist knowledge.

Wait for the next real rain and go outside during it. Water should be visibly leaving the area around the house, downspout extensions should be discharging where they were meant to, and no part of the perimeter should be ponding. Then come back forty-eight hours after it stops and walk the same line. Anywhere still soft is where the perched water is sitting.

Do this once in spring and once after a summer storm. If the corrected areas pass both times and the problem areas from before are dry, the work did what it was supposed to do. If they do not, you have specific evidence to bring back to whoever did it.

Reading the contour of your own lot

You do not need survey equipment to work out what your land is doing, and an hour spent on it makes every subsequent conversation with a contractor more productive.

Start at the highest point of the property and walk downhill, noting where the fall changes and where it flattens out. Flat areas are where water slows and infiltrates, and on a sand-over-clay profile that is where it enters the subsurface layer that carries it sideways. Note where the house sits relative to that pattern, and specifically whether any part of the structure is downhill of a flat collecting area.

Then look at the boundaries. Where does water enter the property and where does it leave? Most lots have one or two natural entry points and one exit, and if the exit is obstructed by a fence base, a raised bed, a shed or a neighbour's landscaping, water backs up behind it.

Then look at what has been added. Driveways, patios, sheds, pools and paths are impervious, and each one takes rainfall that used to soak in across an area and concentrates it at that area's edge instead. A lot that drained perfectly well when it was mostly lawn can behave completely differently after twenty years of improvements, without anybody having done anything wrong.

Sketch it. A rough drawing showing the high point, the low point, the impervious areas and the places that stay wet is genuinely useful, and it is information no contractor can gather in a single visit at one moment in the year.

When the water is coming from next door

On sloping ground, some properties receive water from uphill neighbours, and this is common enough in Gregg County to be worth addressing directly.

The first thing to establish is whether the flow is natural or created. Water that has always crossed the property along a natural course is a different matter from water newly concentrated by a neighbour's regrading, new paving, or a downspout piped to the property line. The legal position on surface water between neighbouring properties in Texas is genuinely complex and beyond what a foundation contractor can advise on, so if the situation is contentious the right professional is an attorney rather than a drainage crew.

The practical position is usually simpler. A curtain drain installed along the upper boundary intercepts incoming subsurface and surface flow and routes it around the house to a discharge point, and it works regardless of where the water originated. It is more trench than a drain tight against the foundation, and on most lots it is the more effective placement anyway.

What is worth avoiding is a solution that discharges collected water onto an adjoining property. That converts a drainage problem into a dispute, and it will cost more than the trench did.

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