Preventing Erosion Under a Poolside Deck on a Slope: Stem Walls and Fabric Solutions

Tarp and gravel creates a "failure plane" that slides off. Instead, extend the deck's concrete stem wall 18–24 inches into the slope to prevent undermining. Add erosion-control fabric (Enkamat) or soil-binding polymer (DirtGlue) on the slope face. Best long-term: establish deep-rooted vegetation. The deck itself shields soil from rain; direct pool splash away from the slope.