Materials › 1 ½" Crushed Stone Image 1 of 1 1 ½" Crushed Stone from $15.75 A clean, angular stone commonly used for drainage, foundation backfill, septic systems, and erosion control applications. Rate: Select Rate Retail Contractor Call for a Quote Added! A clean, angular stone commonly used for drainage, foundation backfill, septic systems, and erosion control applications.