Specialty Products
Roofing Stone
Roofing stone is small, hard rock you spread across flat or low-slope roofs. Most of it is washed river gravel or crushed stone screened between about 3/8 inch and 5/8 inch, though ballast for single-ply roofs can run larger, from 3/4 inch up to about 2 1/2 inch. The pieces have to be clean and durable, with no clay or dust that could clog the roof or wash away in a storm.
The spec that governs it is ASTM D1863. It lists crushed stone, crushed slag, or water-worn gravel as acceptable and fixes the gradation and cleanliness rules. On a built-up asphalt roof, the smaller sizes get pressed into hot bitumen to shield it from sun and foot traffic. On a single-ply membrane roof, larger loose stone weighs the membrane down against wind. It usually costs more per ton than driveway gravel because the rock has to be washed and screened tight.
What people use it for
How to choose within roofing stone
Ask before you order
These aren't catalog items. Confirm size, color, and delivery window with the yard before you commit — every load runs differently.
Match the job to the stone
Flagstone, boulders, ballast, glass gravel — each has one right job. Get the job clear first, then the stone follows.
Lead time is longer
A specialty order usually ships slower than a #57 pallet. Plan the delivery date around the material, not the other way around.
All roofing stone grades
Other specialty products families
Aglime
ReferenceAglime is limestone that's been crushed and ground into a fine powder or grit.
Sand Blend
ReferenceSand blend is sand mixed with something else to hit a specific job.
Squeegee
ReferenceSqueegee is fine crushed rock chips, roughly 1/4 inch and smaller, with the stone dust left in.
Anti Skid Stone
ReferenceAnti-skid stone is a small, angular crushed rock you spread on icy roads, driveways, and walkways so tires and shoes can grip.
Grit
ReferenceGrit is small, angular crushed stone, usually granite or quartz.
3 Stone
Reference#3 stone is large crushed rock, roughly 1 1/2 to 2 inches across the biggest pieces.
Agstone
ReferenceAgstone is finely crushed limestone that farmers spread on fields to raise soil pH.
Asphalt Mix
ReferenceAsphalt mix is crushed rock and sand held together by hot liquid asphalt cement.
Ball Clay
ReferenceBall clay is a fine-grained sedimentary clay that's mostly kaolinite, with some mica and quartz mixed in.
Cold Patch
ReferenceCold patch is bagged asphalt you can shovel into a pothole without a hot mix truck.
Field Soil
ReferenceField soil is native dirt scraped and screened straight from open farmland or unused acreage.
Horse Bedding
ReferenceHorse bedding is the loose material you spread across a stall floor so a horse has a soft, dry place to stand and lie down.