Foundation Drain Installation in Lancaster, PA

A foundation drain is a perforated pipe set in washed stone beside the footing, carrying groundwater away from the wall. It is for Lancaster homeowners with a damp or leaking basement, and for anyone whose old drain tile has silted up or collapsed. We install new systems and replace failed ones.

What a foundation drain is and what installing one involves

A foundation drain, also called a footing drain or perimeter drain, is a perforated pipe that runs around the base of the foundation, beside the footing, in a bed of washed stone. Water that collects in the soil against the wall enters the pipe and runs to a place where it can leave the property. Without it, that water has only three ways in: through the wall, through the joint where the wall meets the floor slab, or through the cores of a block wall.

This is the deepest drainage work at a house. Compared with the wider French drain installation approach, the difference is depth and purpose. A foundation drain sits at footing level and keeps the lower wall dry, instead of moving surface water across a lawn.

We install drains on houses that never had one, and we replace old ones that have silted up, crushed or been buried under additions.

The parts of a foundation drain system

A drain that lasts depends on a few details that are easy to get wrong.

Perforated pipe

Most modern drains use 4 inch perforated pipe, either rigid PVC or flexible corrugated HDPE. Rigid pipe holds its slope better. Corrugated pipe bends around corners more easily. Either way, the pipe is laid on a steady fall toward the outlet so water never sits in the line.

Washed stone and filter fabric

The pipe is surrounded by clean, washed stone, usually three quarter inch crushed rock with no fines mixed in. Fines wash into the pipe and clog it. The stone is wrapped in non-woven filter fabric so the surrounding clay and silt cannot work into the gravel over the years. Leaving out the fabric is the most common reason older drains fail.

Cleanouts and the discharge line

A good installation adds cleanout risers at the corners so the line can be flushed or scoped later. The perforated run then connects to a solid, non-perforated discharge pipe that carries the water away from the house.

Signs you need a foundation drain installed or replaced

Most people find out when water shows up inside. These are the usual signs:

• Dampness or standing water along the base of the basement wall, where the wall meets the floor
• White mineral deposits (efflorescence) on block or poured walls
• A musty smell or mould low on finished basement walls
• Water rising through the slab after heavy rain or snowmelt
• Peeling paint or bubbling sealer on the lower wall
• Soil beside the foundation that stays soft for days after rain

Exterior footing drain or interior drain: which fits your house

Both routes collect water at the foundation. They work in different places, and the right one depends on access.

Exterior footing drain

An exterior drain means digging down the outside of the wall to the footing. That lets us clean and inspect the wall, apply damp-proofing or drainage board, and set the pipe at the correct level. It is the better choice when the house is open on all sides. The trade-off is excavation: the trench goes as deep as the footing, often several feet below grade, and the lawn and plantings along it are disturbed.

When the inside is the better route

Where a walkout, attached garage, concrete patio or neighbouring structure blocks access, the drain can go inside, cut into the slab along the wall. We cover that on our page about interior French drains. It handles water that reaches the floor, but it does not relieve pressure on the outside of the wall, so we will tell you honestly which route fits once we see the house.

How a foundation drain installation goes, step by step

The order matters more than the speed. A typical exterior job runs like this:

• Have underground utilities marked and set aside the plants, steps and hardscape that must survive.
• Excavate along the wall to the bottom of the footing, working in short sections.
• Clean the wall, patch visible cracks, and apply damp-proofing or drainage board where needed.
• Lay a base of washed stone and set the perforated pipe on a continuous fall, with cleanouts at corners.
• Cover the pipe with stone, fold the filter fabric over the top, and backfill in layers.
• Connect the discharge line and run water through it before the trench is closed.
• Regrade so the surface slopes away from the house, and restore the disturbed ground.

Where the water goes: daylight, sump pit or dry well

A footing drain is only as good as its outlet. We settle the discharge before any digging starts.

Gravity discharge to daylight

On a sloped lot the best option is a solid pipe that runs downhill and emerges at the surface, where water simply flows out onto the ground. It has no moving parts and nothing to service.

Sump pit and pump

On a flat lot, or one where the drain sits below any place it could exit, the line empties into a sump pit and a pump lifts the water out. It works, but it needs power and eventually service, so it is the second choice.

Dry well

Water can also go to a buried chamber that lets it soak slowly into the ground. That only works where the soil drains. Our page on dry well installation explains how size and location are chosen.

Foundation drainage in Lancaster homes

Lancaster sits in the Piedmont region, just north of the Conestoga River, and averages 42 inches of precipitation a year. September is the wettest month, and the winter of 2009-10 brought 72 inches of snow. A wet autumn and a heavy snowmelt both saturate the soil around a foundation, and a drain that coped in a dry year can fall behind in a wet one.

Lancaster was settled in the 1720s, and older houses in a city that age often have stone or block foundations built before footing drains were standard. Those walls may have no drain at all, or an old clay tile line that has been silting up for decades. Stone needs a gentler dig and more careful repointing than poured concrete, so we check the wall type first.

[Lancaster French Drain](/) also looks at roof water before quoting any drain work. A downspout emptying at a corner can overload a footing drain, so those get piped away separately.