How do clean rock and minus differ?
Clean rock is stone screened to a specified grading, with the fines removed. Minus, such as crusher run, is stone mixed with smaller particles down to fines. That difference affects how a material packs and how water moves through it, so compare the specification, not just the color or the name.
Which one does my job need?
| Question | Clean rock | Minus / crusher run |
|---|---|---|
| What is in the load? | Stone screened to a specified grading, with fines removed | Stone and smaller particles, including fines |
| What is it for? | Drainage, or a surface where water must pass through | A compacted base |
| What to match when ordering | The specified size and use | The required base material and compaction spec |
| What still needs checking | Acceptable fines, placement, and where water can leave | Subgrade, moisture, layer thickness, and compaction method |
Write down the job first: a compacted base, stone around a drain pipe, or a top-up on an existing surface. A material that packs into a dense base can be the wrong choice where a drain needs open spaces. For a designed project, the installer's or engineer's specification settles it.
J1S stocks crusher run, a blend of angular stone and fines, and #57 limestone, a clean stone. These photos are references only. Ask for the material specification when size, fines, or cleanliness matters.
Is minus the same as screenings?
No. A minus base has a range of particle sizes. Limestone screenings are the finer material separated out during processing. Both contain fines, but they do different jobs in a base, a bedding layer, or a drain. See stone dust versus limestone screenings.
Names are not universal either. "#57," "clean," "crusher run," and "three-quarter minus" mean different things at different yards. One quarry's explanation, from Washington Rock, shows the same split, but its products are its own. Send the actual specification if you have one.
For a driveway, check the base first
A firm drive that has lost some surface stone needs a different fix from one with wet ruts. Clean stone does not drain wet ground on its own, and minus does not compact itself. If water collects or mud works through the stone, review driveway grading and repair before ordering a top-up. To compare layers, see the driveway gravel guide.
What to send with your order
The material name or specification, what it is for, the quantity, and the delivery address. Ask which unit the quote uses: cubic yards measure volume, tons measure weight. Say whether you need only a delivered pile, or spreading, grading, or compaction too.
The gravel calculator estimates driveway quantities. Confirm the final order and unloading access with dispatch.
Sources
- Washington Rock, on clean versus minus rock: a quarry's explanation of the difference between clean and minus rock. Its product names and rock source are specific to that supplier.