How much 57s do you need?
Enter the size of your drain trench or slab bed. You get tons, cubic yards and truck loads of 57s.
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How this was worked out
Assumes 57s at 1.35 tons per cubic yard. Other gravel weighs a little more or less, so ask your supplier for their number.
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About 57s
57s is what drivers and crews call #57 stone on the job. It is clean stone, an inch and smaller, with no dust and the same weight as #57. Order it for a French drain or a slab bed and the truck brings the same load.
Also called #57 stone, washed 57.
More about 57s
The plural comes from talk at the scale house: a driver hauling 57s is hauling #57 stone, and nobody says the number sign out loud. The same habit gives you 67s, 78s and 89s for the other clean sizes.
On a site, 57s are the stone crews reach for wherever water has to move. They go in the bottom of footing drains, around the perforated pipe behind a retaining wall, and under a garage slab where a vapor barrier sits on top.
Rake them to grade instead of trying to pack them; the stones settle under a plate but never set up hard. A wet load drains in a few hours and comes back close to its dry weight. If a supplier offers both washed and unwashed 57s, take washed for drainage, because the dust on unwashed stone rinses down into the pipe. Ask for 57s at a garden center that sells mostly to homeowners and you may get a blank look, so say #57 stone there.