Drainage Materials
Drainage Materials Bedding
Drainage bedding is clean, angular crushed stone that you place under and around a pipe in a trench. The stones lock together to cradle the pipe so it doesn't shift or sag. Water moves through the gaps between the pieces instead of pooling around the pipe or washing the soil away.
Bedding stone usually falls in the #57, #67, or #8 range from the ASTM D448 spec. That means the pieces run from about 1 inch down to 1/4 inch, washed clean of dust so nothing plugs up the flow. Price is close to standard clean crushed stone in the same size, since it's often the same rock pulled off the same screen.
What people use it for
How to choose within drainage materials bedding
French drain
Washed 3/4" to 1" stone. Angular so it locks around the pipe, washed so it doesn't clog with fines.
Foundation perimeter
Larger clean stone — river rock or #57 — moves water away without holding it.
Downspout dispersion
Cover the splash zone with clean rock so runoff spreads instead of digging a hole.
All drainage materials bedding grades
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Other drainage materials families
Drainage Materials Drain Rock
ReferenceDrain rock is washed, clean stone with the fines rinsed out and the pieces sized close to the same.
Drainage Materials Sand
ReferenceDrainage sand is a clean, washed sand with the fines rinsed out so water moves through it instead of pooling.
Drainage Materials Rip Rap
ReferenceRip rap is big, angular broken stone placed along creek banks, ponds, and drainage channels to stop water from cutting into the ground.
Drainage Materials Fill Material
ReferenceAny stone sold as drainage fill has been washed and screened so no dust or sand rides along with it.
Septic Rock
ReferenceSeptic rock is clean, washed stone that surrounds the perforated pipes in a septic drain field.