Correcting Foundation Drainage Errors That Cause Basement Odors

Basement smell from water seepage. Advised to redo/elevate "rock beds" against house.

"Rock Bed" Confusion

If above-grade rock mulch: worsens seepage by holding water against wall. Drainage structures are below grade.

Correct Components

• Footing drain (perforated pipe + gravel) at foundation base.
• Gravel backfill (not soil) against wall.
• Clay cap (6 in) or concrete/paver apron at grade to shed water.
• FIN drain (dimpled membrane) on wall → footing drain.
• All pipes sloped 1–3% (⅛–⅜ in/ft).

Retention Areas

Keep ≥10–15 ft from house.

Waterproof Basement

Damp-proof or waterproof exterior walls. Consider removing soil, replacing with gravel.