French Drain at Patio Low Spot: Better to Use an Area Drain

A wisteria root has lifted one corner of a brick patio, creating a bowl that puddles. A French drain at the low spot will clog with wisteria roots. Instead, install a small area drain (6×6″ or 12×12″ box with flat grate) at the low point, piped around the house to a lower outlet.

Installation

1. Set drain box ¼″ below finished brick surface (allows for settling).
2. Use solid PVC pipe (not perforated) to convey water away.
3. Backfill with gravel around the box; compact.
4. Re-lay bricks around the grate.

NDS drain products offer suitable boxes and grates.