Interior Drainage Systems

An interior drainage system does not try to make a foundation wall watertight. It accepts that water reaches the foundation — in Connecticut, with clay soil and a high water table, it will — and gives that water a controlled path out before it crosses your basement floor. That is why it works on poured, block, and stone foundations alike, and why it is the default recommendation for most Hartford County homes.

How it is installed

1. A trench is cut into the basement floor around the inside perimeter, usually 12–18 inches wide, down to the footing.
2. Perforated pipe goes in gravel in the trench, pitched so water flows to the sump basin. This is the drain tile itself, priced at roughly $60–$120 per linear foot installed.
3. Wall membrane is fastened to the inside walls, channeling wall seepage down into the trench instead of across the floor.
4. The trench is concreted over, restoring the floor, and the system is tied into a sealed sump basin with a primary pump, a battery backup, and an alarm.

What it costs

A full-perimeter system for a typical basement runs $6,000–$12,000, driven mainly by linear feet of wall. A small ranch perimeter costs less; a large colonial costs more. Finished basements add labor for wall and floor restoration. The pump and backup are usually itemized separately — make sure both are in the quote, not just the primary pump.

When interior is the right answer — and when it is not

Interior drainage is right for seepage at the wall-floor joint, chronic dampness, high water tables, and stone foundations where exterior excavation is risky or impractical. It is the wrong answer when the wall itself is structurally failing — bowing, severely cracked, or moving — because drainage manages water, it does not hold up a wall. It is also not the answer when the real problem is surface water: gutters dumping at the foundation and grading that slopes toward the house should be fixed first, and a good contractor says so.

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