Stabilizing a Dry-Stack Rock Stairway Against Erosion

Debbie's husband built a rock stairway down a hillside without mortar. She wants to seal the compressed soil between rocks to prevent washout.

Use Sharp Sand, Not Soil

Builder's (sharp) sand packs tightly and resists erosion. Mix in a little native soil to match the color if needed. Sweep the blend into the joints.

If Soil Is Already in Place

Wait for the first rain to wash out loose material, then refill with the sand-soil mix. The angular sand particles lock together, creating a stable, permeable joint that won't easily wash away.

Simple, effective, and low-maintenance.