Where To Lay Down Exterior French Drain?


Dig a trench along the outside of your footing. The trench should be at least 2 feet wide, and can be as deep as 6 feet for a basement or as shallow as two feet for a slab-on-grade home. Lay the pipe on the virgin soil.


Place the drain with the drainage holes face down in the trench. Lay the pipe in the trench so the slotted holes face downward, as this allows the water to flow through the pipe into the draining site. Make sure you have enough pipe to fill the length of the trench. The pipe should sit snugly in the gravel.

DIY French Drain for Under $250

High capacity french drain Installed and shown in action

How To Install Perforated Pipe, French Drain for Do It Yourself Job

Frequently Asked Questions

How do you install an outside French drain?

How to Install a French Drain

  1. Call the 811 hotline to have underground utilities marked.
  2. Dig the trench system.
  3. Line the trench with landscape fabric. ...
  4. Add 2 to 3 inches of gravel to the bottom of the trench.
  5. Lay the drain pipe in the trench, with the drain holes facing down.

Why do you need a French drain in your yard?

Drainage problems in your yard can lead to pooling, mold or water damage in or around your home. Luckily, you can avoid these problems by installing a French drain. A French drain is a trench filled with a perforated pipe and gravel that allows water to drain naturally from your yard.

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