“2.5” minus clean stone” refers to a type of crushed rock where the largest pieces are around 2.5 inches in diameter, making it suitable for base layers in construction projects like driveways or pathways where good compaction is needed; essentially, “minus” indicates the presence of these smaller particles compared to a “clean” stone which would be mostly large pieces with very minimal fines. 

• Application:

  Commonly used for driveways, pathways, and areas where good stability is needed.