What Is French Drain Installation?
A French drain is a trench filled with clean gravel around a perforated pipe that collects groundwater and carries it away from the foundation by gravity. It is a proven way to lower the water table next to a basement or foundation wall so hydrostatic pressure never gets the chance to force water inside. APS installs French drains along the exterior perimeter, across problem areas of the yard, or as part of an interior footing system, depending on where the water collects. In Alabama's clay soils, which hold water against the foundation after every heavy rain, a properly bedded and sloped French drain is one of the most effective ways to keep that water moving past the house.
How French Drain Installation Works
The drain works on gravity and the path of least resistance. A trench is dug to the right depth and sloped continuously toward a discharge point. A perforated pipe sits in a bed of clean, washed gravel and is wrapped in filter fabric so soil does not clog it. Groundwater in the surrounding soil seeps into the gravel, enters the pipe through its perforations, and flows downhill to daylight, a dry well, or a drainage outlet, away from the foundation. Because the drain always offers water an easier path than the basement wall, it keeps the water table down where it matters.
“Water always takes the easy path. A French drain makes sure the easy path runs away from your foundation, not into it.”
How APS Installs French Drain Installation
- 1
Locate the Water and Set the Route
APS identifies where groundwater collects and plans the trench route and discharge point so the drain runs from the wettest zone to a safe outlet.
- 2
Trench to Depth and Slope
The trench is excavated to the depth needed to intercept the water and given a continuous downhill slope toward the outlet.
- 3
Filter Fabric and Gravel Bed
The trench is lined with filter fabric and a bed of clean washed gravel is placed to surround the pipe and keep soil out.
- 4
Perforated Pipe and Backfill
Perforated pipe is set in the gravel, wrapped, and covered with more gravel, then the fabric is folded over and the trench backfilled.
- 5
Discharge and Restoration
The outlet is finished at daylight, a dry well, or a drainage system, and the surface is restored. APS confirms flow before completing.
What French Drain Installation Costs and What Is Covered
Cost Range
Cost depends on the linear footage, access, and system specified. APS provides a free written estimate after the assessment.
Warranty
APS in-house workmanship warranty plus manufacturer warranties on system components, both fully transferable to future owners
Frequently Asked Questions
What is the difference between a French drain and interior drainage?
Both collect and move water, but a French drain is a gravel-and-pipe trench that lowers the groundwater around the foundation, often outside or in the yard, while interior drainage runs inside at the footing and ties to a sump. Many homes benefit from both, and APS recommends the mix that fits your water problem.
Do French drains clog over time?
A drain built with clean washed gravel and wrapped in quality filter fabric resists clogging because soil fines are kept out of the pipe. Poorly built drains that skip the fabric or use dirty fill are the ones that silt up. APS builds to keep them flowing.
Where does the water go?
To a safe outlet away from the foundation, either daylight on a downslope, a dry well, or a larger drainage system. APS plans the discharge so the water does not simply reappear at another part of the house.
Will a French drain fix my wet basement by itself?
It depends on the source. If the problem is groundwater and surface water loading the foundation, a French drain can be the primary fix. If water is already entering at the cove or through the wall, APS may pair it with interior drainage and waterproofing for a complete result.