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Screened vs Minus vs Washed: What’s the Difference?
If you’ve ever seen “quarter minus,” “quarter screened,” and “quarter washed” on a supplier’s price list and wondered what the difference is — you’re not alone. They all start as the same raw material, but the way they’re processed changes how they look, how they perform, and which jobs they’re best for.
Last updated March 2026
It All Starts at the Crusher
Every aggregate product begins the same way: large boulders are fed through a crushing plant and broken down into smaller pieces. The crusher produces a mix of angular rock fragments in various sizes — from the stated dimension all the way down to fine powder (called “fines”). What happens after the crusher is what separates these three products.
Screened
No fines
Crushed → Screened
Washed
No fines + rinsed
Crushed → Screened → Washed
Minus
e.g. ¼" Minus · ¾" Minus · ABC Road Base
What it is
The raw output from the crusher, unprocessed. It contains everything — rock fragments, smaller chips, sand-sized particles, and fine dust. "Minus" means everything at or below the stated size, including the fines.
Why contractors use it
The fines act as a natural binder. When you wet it down and compact it, minus material locks together into a firm, stable surface. It's the go-to for base layers, utility trenches, and anywhere you need solid compaction.
✕Don’t use for: Drainage — water won't move through a fines-packed material. Don't use for French drains or anywhere water needs to flow.
Common applications
Compacted base under paversUnder concrete slabsDriveways & parking padsArtificial turf baseBackfill for retaining wallsUtility trenchesLeveling & grading
Screened
e.g. ¼" Screened · ¾" Screened · Drainage Rock
What it is
Crushed rock that's been run through a vibrating screen to remove the fine particles. You're left with clean, angular pieces in a relatively uniform size range, with most of the dust and sand-sized fines shaken out.
Why contractors use it
Screening gives you a more uniform, cleaner-looking product. It drains well because water flows through the gaps between particles instead of being trapped by fines. It still has some residual dust on the rock surfaces, but significantly less than minus.
✕Don’t use for: Base work — no fines means nothing to lock the surface together. It'll stay loose under pavers or slabs.
Common applications
French drainsDry creek bedsDecorative ground coverWalkways & pathwaysDog runs & play areasAround plants for drainagePipe bedding
Washed
e.g. ¼" Washed · Washed Sand · Washed Gravel
What it is
Screened rock that's also been run through a water wash. This removes the remaining dust, clay film, and ultra-fine particles that cling to rock surfaces even after screening. The result is the cleanest version — individual stones are visibly sharper in color and free of the chalky coating you see on dry-processed rock.
Why contractors use it
Washing brings out the natural color of the stone. If you've ever noticed that rock looks better wet than dry, that's because water removes the dust layer. Washed rock looks "wet" all the time. It's also the preferred spec for concrete aggregate and pipe bedding where fines can cause problems.
✕Don’t use for: Compacted base — you need fines to bind. Washed material stays loose. For a buried base layer, the extra cost isn't justified.
Common applications
Exposed aggregate concreteHigh-visibility landscapingPipe bedding (ASTM/MAG spec)Pool decks & outdoor livingPlaster sandHigh-flow French drainsAnywhere color matters
Side-by-Side Comparison
| Minus | Screened | Washed |
|---|
| Processing | Crushed only | Crushed + screened | Crushed + screened + washed |
| Fines content | High (dust, sand, powder) | Low (some residual dust) | Minimal (clean surfaces) |
| Compaction | Excellent — locks together | Moderate — stays looser | Low — individual particles |
| Drainage | Poor — fines block water | Good | Excellent |
| Typical cost | Lowest | Mid | Highest |
How to Choose
The decision usually comes down to one question: does this material need to compact, or does it need to drain?
MinusBuilding a base under pavers, a slab, or artificial turf? Go with minus. The fines are what make it pack down solid.
ScreenedCovering a landscape bed, filling a drainage trench, or creating a walkway? Screened gives you a cleaner look at a reasonable price.
WashedThe job is visible, color matters, or the spec calls for washed aggregate? Worth the premium.
When in doubt, tell us what the project is. Dispatch will flag any spec mismatch before the truck is loaded.
Still not sure which spec to order?
Drop your material and application in the notes field. Dispatch will confirm the right product before any truck is loaded.