Crushed Drain Rock 1½"
Best for: Heavy water flow and deep drainage where you need big voids.
Type
Crushed drain rock
Size
1½" — largest
Shape
Angular, washed
Drainage
Excellent — high volume
Overview
About Crushed Drain Rock 1½"
Crushed drain rock one-and-a-half inch is the heavy-duty end of the drainage family, where capacity and stabilization are the goal. The larger stone creates larger voids and far greater water-carrying capacity, and it bridges and locks over soft, saturated ground to form a firm working platform where smaller rock — and equipment — would sink. Crews specify it for high-volume and deep-trench drainage, drywells and infiltration pits, erosion and scour control, and construction-entrance and mud-control pads. Too coarse for fine pipe bedding but unmatched where you need to move serious water or stabilize wet subgrade, it is the largest of our three drain-rock sizes.
- ✓Large angular 1½" crushed rock.
- ✓Big voids for high-volume drainage.
- ✓Deep trenches, drywells & stabilization.
- ✓Handles heavy water flow and soft ground.
Crushed drain rock 1½" is the heavy-duty, large end of the drain-rock family. The bigger stone creates bigger voids, which means far greater water-carrying capacity — the right choice when you are moving serious volume or working deep. It also bridges and stabilizes soft, wet ground better than smaller rock, knitting into a firm working platform where equipment would otherwise sink.
Use it for high-volume and deep-trench drainage, drywells and infiltration pits, erosion and scour control, construction-entrance and mud-control pads, and stabilizing saturated subgrade. It is too coarse for fine pipe bedding — drop to 3/8" or 3/4" for that — but unmatched where capacity and stabilization are the goal. Sold by the ton at roughly 1.4 tons per cubic yard. (Size guide: 3/8" smallest, 3/4" standard, 1½" largest.)
Specifications
The details
- Type
- Crushed drain rock
- Size
- 1½" — largest
- Shape
- Angular, washed
- Drainage
- Excellent — high volume
- Unit weight
- ≈ 1.4 tons / cu yd
- Sold by
- Ton
Applications
Common uses
- ✓ High-volume drainage
- ✓ Deep trench drains
- ✓ Drywells & infiltration pits
- ✓ Ground & subgrade stabilization
- ✓ Erosion & scour control
- ✓ Construction-entrance / mud pads
Need Crushed Drain Rock 1½" on site?
Priority delivery across French Camp & San Joaquin County.
Questions
Crushed Drain Rock 1½" — FAQ
- When should I use 1½" drain rock instead of 3/4"?
- Use 1½" for high-volume or deep drainage, drywells, erosion control and stabilizing soft wet ground. Use 3/4" for standard French drains and wall backfill.
- Is 1½" rock good for stabilizing muddy ground?
- Yes — the large stone bridges and locks over soft, saturated subgrade to form a firm platform, which is why it is used for construction entrances and mud pads.
- Can I bed pipe in 1½" rock?
- It is too coarse for fine pipe bedding — drop to 3/8" or 3/4" for that. Save the 1½" for capacity and stabilization.
More materials
Explore the rest of the yard
QuarryVirgin Baserock (AB Class 2)
Virgin baserock is the structural backbone of paved construction — a quarry-fresh Class 2 aggregate base crushed from solid stone and graded continuously from three-quarter inch down to fines. Because every particle is freshly fractured and angular, the blend keys together and compacts into a dense, rigid platform that distributes traffic loads down to the subgrade without rutting, pumping or settling. It is the same material specified beneath California highways, parking structures and building pads — certified to a minimum R-value of 78 and a sand equivalent of 22 under Caltrans Standard Specifications Section 26. When your project demands a clean, certified, load-bearing foundation engineered to perform for decades, this is the base to build on.
QuarryWash Baserock
Wash baserock delivers the structural performance of Class 2 aggregate base with a cleaner, free-draining character. It is the same crushed base material run through a wash plant to flush out excess silt and clay fines — the result is a low-dust product on the jobsite and a more permeable platform that lets water move through rather than perch on top. It still keys together and compacts under pavement and pads, but it is the smarter specification wherever drainage, cleanliness and a tidy backfill matter as much as raw stiffness. Crews choose it under permeable pavers, behind retaining walls and as pipe and utility base where washed material is preferred or required.
RecycledRecycled Base (Class II)
Recycled base is reclaimed concrete and asphalt, crushed and screened back into a graded three-quarter-inch aggregate that meets Caltrans Class II strength — engineered performance at a materially lower cost. The crushing process leaves the same angular, interlocking particle shape as virgin rock, so it compacts into a hard, stable platform that carries load just like quarried base, with a mild self-cementing tendency that can stiffen it further over time. For the vast majority of driveway, lot and pad work it performs on par with new base while diverting demolition debris from the landfill — a genuine sustainability advantage that can also support green-building credits. Produced on site at our French Camp yard, supply stays steady, local and competitively priced.