Fill Materials Screenings

Screenings are the fine stuff left over when rock gets crushed and sorted at the quarry. The pieces run from about 3/8 inch down to dust, and they're all sharp-edged because they came straight off the crusher. Spread a layer, run a plate compactor over it, and the small bits pack into the gaps between the bigger ones so it locks up hard.

The name just tells you where it came from — the pile that fell through the smallest screen at the plant. You'll also hear it called stone dust, crusher fines, or quarry dust. It's usually the cheapest thing on the price list because it's a byproduct of sizing the bigger stone. Whether the rock underneath is limestone, granite, or trap rock depends on what your local quarry runs.