#89 Crushed Stone for Florida Paver Joints and Flagstone Bedding

The decision in front of most buyers at this size is not which brand of small stone to order but whether the stone should bind or drain, and on a patio that takes a thunderstorm most afternoons from late May onward the two behave nothing alike. #89 crushed stone is the one that binds. It runs from about 3/8 inch down to fines, graded #89, angular crushed stone with dust included rather than washed out. Those fines are the whole point of it.

Gray limestone chips with dust still on your hands

Tip a sample out and it looks less like gravel than like a coarse grit. Most pieces are chip-sized, no bigger than a fingernail, with sharp broken faces that catch on each other. Between them sits a gray powder that grays your palm when you pick up a handful and rises in a small cloud if you tip it out in a dry week. In Florida the stone under that dust is almost always crushed limestone, so the color is pale gray and it lightens further as it dries.

That dust changes the handling completely. Damp, the material sweeps and packs beautifully. Dry and windy, it drifts, and on a still day after a storm it can cake if it has been sitting in a puddle. Order it for a job you are ready to do rather than for a pile that waits three weeks in a bed.

Joints, flagstone bedding and a side-yard dog run

The material earns its place in confined, finished spaces rather than open ones.

Swept into paver joints it locks the field together, and unlike loose sand it does not wash straight out of the joint the first time a downpour runs across the patio. Under flagstone or steppers it makes a bedding layer you can screed, tap a heavy irregular slab into, and trust to hold the slab level rather than letting one corner sink.

The side-yard dog run is the less obvious one, and it does work, with a caveat. Over a compacted base, a couple of inches of this material tamps down into a firm, fast-draining surface that hoses clean and does not turn to mud the way bare sand does after a wet week. Stone Screenings are the usual Florida pick for that job and go finer still. #89 gives a slightly coarser finish with less dust underfoot, which some owners prefer where the run comes off a back door.

A spa pad and a turnaround are base work, not bedding work

Both come up and both are the wrong call.

A hot tub sits on a static load that has to be carried without dipping, and a bedding grading a couple of inches thick cannot do that over loose sand. The pad wants a proper compacted course of Limerock Base or an open-graded stone, built to depth and rolled, with the finish layer chosen afterwards.

A turnaround or parking pad is the same problem with tires added. Vehicles turning on the spot shear a fine material sideways, and small chips get picked up in a tread and carried out to the road. Build that with a compacted base and a coarser wearing course such as Driveway Gravel.

Sweeping depth, bedding depth and what settles to what

Three depths cover nearly everything this material is used for.

Joint fill has no depth of its own. You sweep it in, vibrate or tamp the field, sweep again, and repeat until the joints stop taking material. Plan on going back over a new patio once more a few weeks later.

Flagstone or paver bedding runs about an inch to an inch and a half, screeded flat, and it is worth being strict about this. A thick bedding layer is a layer with more room to settle unevenly, which is how a slab ends up rocking.

A walked-on surface such as a dog run or a service path runs two inches over a base that has already been compacted. Those two inches are the finished, tamped thickness. Spread it a little proud and tamp down to the line, because material placed loose and left alone will settle on its own through the first rainy season and leave you with a dip.

Tons for a 14 by 18 flagstone bed and a 4 by 36 dog run

The stone calculator takes feet for length and width, inches for depth, handles rectangles, circles and up to five areas, and adds five percent by default. It works (L x W x D/12) / 27 = cubic yards, then applies density for tons. The published figure here for #89, #8 and 3/8 inch chips is about 2,800 lb per cubic yard, or 1.40 tons per yard. Three hypothetical quantities:

• Flagstone bedding across a 14 ft by 18 ft patio at 1.5 inches. 14 x 18 = 252 sq ft. 252 x 0.125 = 31.5 cubic feet. 31.5 / 27 = 1.17 cubic yards. 1.17 x 1.40 = about 1.6 tons.
• Joints on that same patio, taking joints as roughly a tenth of the surface at 1.5 inches deep. 25 sq ft x 0.125 = 3.1 cubic feet, about 0.12 cubic yards, or roughly a sixth of a ton. Add it to the bedding order rather than ordering it alone.
• A 4 ft by 36 ft dog run, 2 inches finished. 4 x 36 = 144 sq ft. 144 x (2/12) = 24 cubic feet. 24 / 27 = 0.89 cubic yards. 0.89 x 1.40 = about 1.2 tons, sitting on roughly 1.8 cubic yards of compacted base at 4 inches.

Put your own measurements through the stone calculator, then pick a quantity and a delivery date on this page. Delivery is arranged at checkout by ZIP code, and the truck needs clear access to a spot it can tip. Choose that spot on a hard surface if you can: fines wash out of a pile on bare sand in a heavy shower.

#89 crushed stone against screenings, #8 and 3/8 inch

The four look similar in a photograph and behave in four different ways once wet, which is why the grading number matters more here than anywhere else in the yard.