Concrete Aggregate

Concrete Aggregate Drain Rock

Drain rock is clean, washed rock with the dust and fines rinsed out. Pieces usually run 3/8 inch to 1-1/2 inch, and water flows right through the voids between them instead of getting held up in dirt. The rock itself can be angular crushed stone or rounded river stone, depending on what's local to your area.

The name describes what the rock does on the job. There's no rule about which type of rock it starts as. Some yards sell washed granite; others use limestone or river gravel. What matters is that the fines are washed out so water can flow through the gaps between pieces. Expect to pay a bit more than unwashed crushed stone because the washing step costs money.

named grade in this family

What people use it for

French drains along a wet spot in the yardFooting drains around a foundation or basementSeptic leach field bedsBackfill behind retaining walls to relieve water pressureDry wells and downspout dispersal pitsUnderdrain layer beneath patios, paver bases, and driveways

How to choose within concrete aggregate drain rock

Match the mix design

Batch plants and ready-mix trucks work to a spec. Confirm the size and gradation the plant is running before you order.

Coarse vs. fine

Coarse aggregate gives the mix its strength; fine aggregate fills the gaps. A slab needs both — usually delivered separately and blended at the plant.

Cleanliness matters

Fines and clay contamination weaken the cure. If a load looks dusty, ask for a wash spec sheet before you take delivery.

All concrete aggregate drain rock grades

Drain Rock (Concrete, Leach Rock, Gray)

French drainsseptic systemslandscaping

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Other concrete aggregate families

Concrete Sand

Reference

Concrete sand is a coarse, washed sand screened to a specific size range so it works in a concrete mix.

16 grades→

Concrete Aggregate Sand

Reference

Concrete sand is a coarse washed sand with grains up to about 3/8 inch across.

4 grades→

Concrete Aggregate 57 Stone

Reference

#57 stone is crushed rock screened to fall between about 1 inch and 1/4 inch, with the fines washed out.

3 grades→

Concrete Aggregate Rip Rap

Reference

Rip rap is large, loose stone dumped along shorelines, creek banks, ditches, and bridge abutments to stop moving water from washing the g…

3 grades→

Concrete Aggregate 67 Stone

Reference

#67 stone is crushed rock screened between about 3/4 inch and 1/4 inch, with the fines washed out.

2 grades→

Concrete Aggregate Gravel

Reference

Concrete aggregate gravel is washed, rounded rock sized to mix into concrete.

2 grades→

Recycled Concrete

Reference

Recycled concrete is old concrete that's been broken up and crushed back down to gravel size.

2 grades→

Concrete Aggregate 1 Stone

Reference

#1 stone is one of the biggest sizes of clean crushed rock you can buy, with pieces roughly 1 1/2 to 4 inches across.

1 grade→

Concrete Aggregate 3 Stone

Reference

#3 stone is crushed rock sized between about 1 1/2 inches and 2 inches.

1 grade→

Concrete Aggregate 4 Stone

Reference

#4 stone is crushed rock that runs about 1½ inch down to ¾ inch.

1 grade→

Concrete Aggregate 8 Stone

Reference

#8 stone is small crushed rock, roughly 3/8 inch down to the size of coarse sand.

1 grade→

Concrete Aggregate 89 Stone

Reference

#89 stone is small crushed rock, sized between about 3/8 inch and the coarse-sand range.

1 grade→

Browse all concrete aggregate families →