Heavy-Duty • Delivery Included
A heavier crushed rock for driveway base layers, soft ground and high-traffic areas. Compacts into a strong, stable foundation built to last.
✓ Licensed, Bonded & Insured · CCB# 246110
1-1/2" minus base rock
What is 1-1/2" minus?
1-1/2" minus is crushed basalt rock ranging from 1-1/2" pieces all the way down to fine dust. The larger rock gives it more strength and load-bearing capacity than 3/4" minus, while the fines help it pack down tight.
It's a great in-between option when you need something stronger than 3/4" minus but smaller than 3" minus, and it's still small enough to walk on. It works well as a base layer under driveways and parking areas, and holds up on its own for commercial drives, heavy equipment areas and spots that see a lot of traffic.
Size
1-1/2" to fines
Type
Crushed basalt
Compacts
Yes, tightly
Best for
Base layers
Common uses
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A strong foundation under 3/4" minus for new or rebuilt driveways.
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Bridges soft spots and keeps your surface from sinking.
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Stands up to tractors, machinery and heavy loads.
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A durable surface for high-traffic drives and entrances.
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Firm parking for trucks, trailers, RVs and equipment.
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Long private roads and farm lanes that need a strong base.
Planning your order
Measure the length and width of your area, choose a depth, and our material calculator will estimate the yards you need. Deliveries start at 4 yards. Not sure? Call or text and we'll help you figure it out.
~108 sq ft
1 yard covers at 3" deep
~81 sq ft
1 yard covers at 4" deep
4–12 yds
Delivery load sizes
Finishing the surface? Top your base with 3/4" minus for a smoother, tighter driving surface.
Our customers say it best
Here's what customers say about ordering from M4 Landworks.
1-1/2" minus questions
It's crushed rock that's 1-1/2" and smaller, all the way down to fine dust. The "minus" means everything smaller than 1-1/2" is included, and those fines help it pack down into a solid base.
1-1/2" minus has larger rock, so it's stronger and better at bridging soft ground and handling heavy loads. 3/4" minus is smaller and compacts into a smoother finish, which is why it's usually the top layer over a 1-1/2" base.
Yes. It makes a strong, durable surface, especially for heavy traffic and equipment. It's a little rougher underfoot and under tires than 3/4" minus, so many people top it with a layer of 3/4" minus for a smoother drive.
Basalt is a hard, dense volcanic rock that's quarried and crushed into sharp, angular pieces. Compared to crushed round rock, which is river rock that's been crushed and still has some smooth faces, basalt has fractured faces on every side. That helps it lock together tighter and compact into a firmer, more stable surface.
Yes. Every price includes delivery, with no separate fees. Pricing is set by location, so choose your town to see the delivered price.
Yes. Along with delivery, we install and repair gravel driveways, including grading, crowning and drainage. Learn about our driveway services.
Still have questions? Call or text 503-680-7446
Ready to order?
Check the price for your town and schedule your delivery online. Delivery is included in every price.
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