Crusher Fines

Crusher fines start as quarried rock run through a crusher, then screened to a target gradation. Unlike clean, washed stone where fines are removed, this product keeps the rock dust intentionally, since that dust is what allows the material to compact into a bound surface. Most suppliers offer 3/8 inch minus as the standard path and patio grade, a blend running from fine gravel down to powder. Some carry a 1/4 inch minus option for a smoother, barefoot friendly path surface, and a coarser 3/4 inch minus version sold as crusher run for driveway and structural base work. Color and mineral character depend entirely on the parent rock, so gray granite fines look and behave differently from tan limestone fines or reddish basalt fines. Because it is an unscreened blend rather than a single uniform particle size, no two quarry sources produce an identical product, so it is worth checking a sample before ordering a large volume for a visible path or patio.

A good crusher fines path starts with excavating 4 to 6 inches, laying landscape fabric to block weeds and stop the fines from mixing into subsoil, then building up in compacted lifts. Spread 2 to 3 inches of material, lightly water it to bring the fines to the surface, and compact with a plate compactor or hand tamper. Crown the path slightly at the center, about a quarter inch of rise per foot of width, so water sheds to the sides instead of pooling and turning the surface soft. Rigid edging, steel, aluminum, or stone, is not optional if you want the path to hold its line season after season, since loose fines migrate outward under foot traffic and rain otherwise. Skipping fabric or compaction are the two most common failures, leading to weeds pushing through or a path that ruts and softens within a year.

Compared with decomposed granite. True decomposed granite is naturally weathered granite with its own page here, while crusher fines are a manufactured product crushed from any parent rock, granite included. They behave similarly once compacted, but stabilized DG products often add a resin binder for extra durability that plain crusher fines lack, making DG the pricier, more polished option.

Compared with clean crushed stone (#57). Clean crushed stone has the fines washed out, so it stays loose and drains freely, the right pick for French drains or drainage layers. Crusher fines keep the dust, which compacts into a firm walkable surface but sheds water instead of letting it through, so it should never substitute for drainage stone.

How much crusher fines do I need. Calculate square footage of the area, multiply by your target depth in feet, then divide by 27 to get cubic yards. As a shortcut, one cubic yard covers about 150 to 165 sq ft at a 2 inch depth, or 100 to 110 sq ft at 3 inches. Add about 10 percent extra to cover compaction settling and edges beyond the finished footprint, since running short mid project means a delayed second delivery.

How it is sold and delivered. Crusher fines are sold by the cubic yard or by the ton for bulk delivery, with a cubic yard weighing roughly 1.2 to 1.35 tons. Bulk delivery drops the material by dump truck at a driveway or accessible drop point, so plan for equipment access and a spot that will not block use of the space while you spread and compact it in stages.