3/4" Crushed Stone for Ohio Footing Drains, Backfill and Wet Pads

The decision in front of most people who land here is not really which size to buy. It is whether the water sitting against the block wall every March is a drainage problem or a grading problem, and whether 3/4" crushed stone is the thing that fixes it. On ground like ours, where the frost line runs about 32 inches through much of the state and closer to 36 inches up north, and where the clay holds every drop of the thaw, it is usually both. The stone is one part of the answer and the fall of the trench is the other.

The footing drain is the job this size is bought for around here

Angular pieces at roughly 3/4 inch, washed clean of fines, do one thing better than any other material on this site: they hold an open structure while carrying the weight of whatever is backfilled over them. That combination is exactly what a footing drain, a wall backfill zone or a drainage blanket under a pad needs. The pieces lock against each other so the layer does not squash shut under load, and the voids between them stay connected so water keeps moving.

Ohio yards usually ask for this size by ODOT size number rather than by inch, which is why #57 limestone and this product sit side by side in the catalogue covering nearly the same band. If you are ordering off a drawing that says 3/4 inch, this is the page. If you are ordering off a conversation with a local excavator, you will probably hear the number.

Saturated clay in March, and what the layer is actually being asked to do

On the flat lake plain in the northwest the surrounding ground will not take water away at any useful rate, so a clean stone trench is a conveyor rather than a soakaway. It has to go somewhere: a ditch, a tile line, or lower ground clear of the house. Dig a stone-filled pit in that clay with no outlet and you have built a cistern.

On the glaciated plateau of the northeast, water perches on the dense subsoil, then runs freely once it reaches a gravel knoll or valley outwash, so the same property can need a drain at one end and nothing at the other. In the southeast hills the issue is speed instead, with runoff arriving fast off steep ground and leaving as quickly.

Freeze-thaw punishes whichever version you get wrong. A drain that empties has little water left in it to freeze. A drain that has silted up behaves like wet soil and heaves the slab, the walk or the wall above it.

Wrapping the stone, setting the pipe and finding an outlet on flat ground

Cut the trench with fall to daylight or to a tile connection before any stone is ordered. Line it with geotextile, lapped up the sides, then bed a few inches of stone, set the perforated pipe with the holes down, and bring the stone up over the crown. Fold the fabric over the top and backfill.

Behind a retaining wall the same logic applies turned on its side: a vertical column of clean stone against the back of the wall, fabric between the stone and the soil, and a weep or a pipe at the bottom taking water out. Under a pad on wet ground, the stone goes in as a leveling and drainage blanket beneath the structural base, not instead of it, and it goes in shallow lifts that are settled as they go.

Where a dog run and a turnaround pad land with this stone

A side-yard dog run is the wrong use. Clean 3/4 inch stone stays loose by design, so it rolls underfoot, turns ankles and is hard on paws. A run wants something that packs or something rounded and kind: walkway gravel for a firm surface, pea gravel for a softer one.

A turnaround or parking pad is a partial fit, and worth being precise about. On wet till this stone makes an excellent drainage layer at the bottom of the build, and on a construction entrance it holds up under tires. It is not the finished surface, because it will never firm up and the loose top will migrate. Build the pad as compacted 304 limestone over that drainage layer, with 411 stone as the topping.

Set against drain rock, and against 411 stone

Drain rock is the bigger washed grade, running 3/4 inch up to an inch and a half, in rounded or angular form. Where a trench is wide, a septic field is being built, or a bigger void is wanted, that is the material. Where the stone also has to carry backfill or sit under a pad, the angular 3/4 inch size does more work per ton.

411 stone is the opposite choice: crushed stone with the fines left in, up to about an inch, which packs tight into a firm surface. It is the driveway topping, and it is what to order when the answer to your problem is firmness rather than flow. The two get swapped by accident more than any other pair on this site.

A 48 foot footing drain, from trench size to tonnage

Take a hypothetical footing drain, 48 feet along the wall, with a trench 16 inches wide carrying 15 inches of stone around the pipe.

• Width: 16 inches = 1.33 feet, so 48 x 1.33 = 64 square feet
• Depth of stone: 15 inches = 1.25 feet
• Volume: 64 x 1.25 = 80 cubic feet
• Cubic yards: 80 / 27 = 3.0 cubic yards
• Tons at about 2,800 lb per cubic yard, or 1.40 tons per yard: 3.0 x 1.40 = 4.2 tons

Order four and a half, because a machine-cut trench is always wider than the one drawn on paper and the last few feet at the outlet usually want more than planned. Put your own numbers through the stone calculator and it will do the conversion on the same figure.

Then pick a quantity and a delivery date on this page. Delivery is arranged at checkout from your ZIP code, and the truck needs clear access to a spot where the bed can be raised safely. Ohio Rock Supply can only put it where a loaded truck can reach.