Grading Foundation Soil to Prevent Basement Moisture

Foundation backfill must match the existing subsoil texture to prevent water trapping.

Correct Material

• Use the same soil type as your subsoil (likely clay).
• Called "local topsoil" or "fill dirt" – cheapest, unamended option.
• Do NOT use blended garden soil, compost, or sand – they hold water against the foundation.

Grading Standard

• Slope 6″ drop in first 10 ft from foundation.
• Compact in 6″ lifts; avoid settling pockets.
• Extend downspouts 6+ ft away.

Matching soil texture ensures uniform drainage away from the structure.