Crusher Run vs. Screened Aggregate: Key Differences
1. Composition
– Crusher Run: A blend of coarse and fine aggregates (from crushed stone/gravel) mixed with stone dust or fines. It typically includes particles ranging from fines up to 1–2 inches in size.
– Screened Aggregate: Uniformly sized material (e.g., ¾” gravel, 2″ stone) that has been mechanically screened to remove fines and smaller particles.
2. Fines Content
– Crusher Run: Contains stone dust or fines, which help compact tightly and bind the material together.
– Screened Aggregate: Lacks fines, resulting in better drainage but less compaction stability.
3. Compaction & Stability
– Crusher Run: Compacts well due to fines, making it ideal for base layers (e.g., driveways, roads).
– Screened Aggregate: Less compact but offers better drainage; used for surface layers or drainage applications (e.g., French drains).
4. Drainage
– Crusher Run: Poor drainage due to fines; water may pool.
– Screened Aggregate: Excellent drainage because of open gaps between stones.
5. Common Uses
– Crusher Run: Sub-base for pavers, driveways, and foundations where stability is key.
– Screened Aggregate: Decorative landscaping, drainage systems, or as a top layer for walkways.
Summary:
– Choose crusher run for structural support and compaction.
– Choose screened aggregate for drainage or aesthetic purposes where uniformity is desired.
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