Can You Mix Round Stones and Screenings for a Paver Base?

When preparing a base for pavers, proper material selection and compaction are critical for long-term stability. A common question arises: can you mix round landscaping stones (3/4 to 1-1/4 inch) with screenings (1/8 to 1/4 inch) instead of using traditional crushed stone?

Understanding the Materials

Round stones, often called pea gravel, have smooth edges that create significant air gaps when compacted. Screenings are fine particles that can fill voids, but they behave differently than angular crushed stone. Crushed limestone or screenings placed directly on undisturbed soil form a stable, uniform base with minimal settling.

The Problem with Mixing Round Stone and Screenings

Mixing round stones with screenings introduces excessive airspace. The screenings will slowly "work in" between the stones over time, leading to uneven settling. This creates an unstable foundation that may cause pavers to shift or crack.

When It Might Work

If you mechanically compact the screenings into the round stone using a plate compactor, you can reduce voids. However, this requires thorough vibration to force fines into every gap. Even then, the base may not achieve the same stability as a properly graded crushed stone base.

Best Practice Recommendation

For a reliable paver base, use crushed stone (like 3/4-inch minus limestone) compacted in lifts. Top with a 1-inch layer of concrete sand or stone dust for bedding. This ensures uniform support, proper drainage, and long-term performance.

If you already have the materials, consider using the round stone for drainage applications (like behind retaining walls) and purchase proper base material for your patio or walkway.