Limerock Base

Florida's standard dense-graded base: crushed limestone graded from a coarse top size down to dust, produced to FDOT Section 911 with a Limerock Bearing Ratio of at least 100 (test method FM 5-515). It is mined from Florida's marine limestone (the Miami, Ocala, and Suwannee formations) and must be at least 70 percent carbonate, so it is regionally specific and not granite or trap rock. The retained fines bind under moisture and compaction into a hard, near-watertight slab.

It is placed as compacted road and pad base beneath asphalt, concrete, slabs, and driveways, typically to 98 percent of modified Proctor density. At about 1.5 tons per cubic yard, one ton covers roughly 100 square feet at 2 inches compacted. It binds rather than drains, so for drainage use a washed stone such as #57 stone. Outside Florida the equivalent base is crusher run.