1 1/2″ Clean Rock: Uses, Coverage & Calculator
Large, washed rock with big gaps between stones, built to move a lot of water fast.
What is 1 1/2″ Clean Rock?
1 1/2″ clean rock is crushed stone screened to roughly 1″–2″ and washed clean. With almost no small particles, the spaces between stones stay open and water drains straight through.
That makes it a strong choice for dry wells, large French drains and erosion control on slopes and ditches, where finer stone would clog.
| Specification | Details |
|---|---|
| Size | About 1″ to 2″ |
| Shape | Angular, crushed |
| Fines | Washed, none |
| Color | Varies by quarry |
| Approx. weight | 1.35 tons (~2,700 lbs) per cubic yard |
Best uses
- Dry wells and large French drains
- Erosion control in ditches and on slopes
- Backfill behind retaining walls
- Driveway sub-base over soft ground
Not ideal for
- Walking or driving surfaces
- Bedding under pavers
- Small decorative beds
How much 1 1/2″ Clean Rock do I need?
Enter your area and depth to get cubic yards and tons. Results update as you type.
You'll need about
Based on about 1.35 tons (~2,700 lbs) per cubic yard. Actual weight varies with moisture and source, so treat results as an estimate.
Recommended depth by project
Typical installed depths for 1 1/2″ Clean Rock. Check local codes or your contractor for structural work.
| Project | Depth | Notes |
|---|---|---|
| Dry well | 24″ | Line the pit with filter fabric |
| French drain | 12″ | Fabric-wrapped trench with perforated pipe |
| Erosion control | 6″ | Thicker on steep slopes |
How to install 1 1/2″ Clean Rock
A few steps make a big difference to how long it lasts.
- Dig the trench or pitSlope trenches so water flows to an outlet.
- Line with fabricFilter fabric keeps soil from clogging the rock.
- Fill and coverFill with rock, fold fabric over, and top with soil or decorative stone.
1 1/2″ Clean Rock questions
Quick answers to what customers ask most.
Is bigger rock better for drainage?
For moving large volumes of water, yes. Bigger, clean rock leaves more open space. For pipe bedding, a smaller stone like #57 is easier to work with.
How much area does a ton cover?
At 4″ deep, about 60 sq ft per ton.
Do I need fabric under clean rock?
In most drainage work, yes. Fabric stops soil from washing into the gaps over time.
Related materials
Not sure this is the right one? Compare similar options.
Gravel & Crushed Stone3/4″ Clean Gravel (#57 Stone)Washed 3/4″ stone for drainage, driveway top layers and concrete.
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Gravel & Crushed Stone#4 Crushed StoneLarge stone for heavy bases, construction entrances and drainage.
Read guide & calculator →
Driveway & LandscapingRiver RockSmooth, rounded stone for decorative beds and dry creek beds.
Read guide & calculator →Ready to order 1 1/2″ Clean Rock?
Delivered by the ton or cubic yard to your driveway or job site.