Foundation Perimeter Drainage in Longview, Texas

Why slab edge moisture matters

Most Longview homes sit on slab on grade foundations. Slabs are sensitive to uneven moisture around the perimeter: one side saturated while another dries out produces differential movement, and that shows up as sticking doors, cracks in brick and drywall, and separations at joints. Repeated wet and dry cycling at one corner is harder on a foundation than uniformly damp soil all the way around.

Perimeter drainage is not a foundation repair, and no drainage system should be sold as one. It is a way to make soil moisture around the house more consistent and stop water from pooling against the slab. If a foundation has already moved, a structural engineer or foundation contractor is the right professional to evaluate it.

Where the water is usually coming from

Roof runoff

A roof concentrates an enormous volume of water into a handful of downspouts. When those discharge at the slab, the soil in that spot never gets a chance to equalize. Extending or piping downspouts is the first and cheapest step, and on many Longview houses it removes most of the problem.

Negative grade

Backfill settles over the years and beds get built up, both of which tilt the ground back toward the house. Water then follows the slab edge looking for a low point. Correcting the grade often has to happen before or alongside any piped system.

Water arriving from uphill

On the sloping upland parts of Longview, Judson and Kilgore, a house partway down a slope receives everything the ground above it sheds. That is the classic case for an interceptor line placed uphill of the structure rather than a drain hugging the slab.

Shallow subsurface flow

In some yards water moves laterally through the upper soil layer above a tighter layer below and surfaces near the foundation. It looks like a spring and behaves like one. A properly placed interceptor drain, set at the right depth, is the standard response.

How perimeter systems are built

A perimeter or interceptor drain is a gravel and perforated pipe line, typically placed on the uphill side of the house or wrapping the wet portion of the perimeter, set back from the slab far enough to avoid undermining it. Filter fabric wraps the stone, cleanouts are placed at ends and corners, and the discharge run uses solid pipe so nothing re enters the soil next to the house.

Depth is limited by two things around Longview: the bottom of the footing or beam, which nobody should trench below without engineering input, and the water table on lower lots. A shallow line set correctly and running to a real outfall beats a deep line that fills with groundwater.

The outfall constraint applies here too

A perimeter system moves a lot of concentrated water, so it needs a genuine place to put it. Discharging near a corner of the same lot at almost the same elevation just moves the problem twenty feet. On flat lots near the Sabine bottom, foundation perimeter water is a common reason a basin and pump system ends up being the practical answer, because the house sits at or near the lowest usable elevation on the property.

Sequence that usually makes sense

1. Fix downspout discharge and get roof water away from the slab.
2. Correct negative grade in the first several feet around the house.
3. Add an interceptor line uphill of the structure if water still arrives from above.
4. Add area drains or catch basins where surface water still ponds at the perimeter.
5. Add a basin and pump only if no gravity outfall exists for the collected water.

What to ask a contractor

• Where exactly will this water discharge, and how much fall is there to that point?
• How far from the slab will the trench sit, and how deep relative to the footing?
• Is the discharge leg solid pipe, and where are the cleanouts?
• Does the plan include downspout tie ins and grade correction, or pipe only?
• What is the plan for restoring beds, sod and any irrigation lines that get cut?

Get connected with Longview contractors

Send a short description of where the water stands, which side of the house it affects, and whether you are seeing movement indoors. Requests go to independent local contractors who handle perimeter drainage in Longview and the surrounding Gregg County towns.