Blue-Gray Granite Dust

Blue-Gray Granite Dust — The Compactable Fines That Lock Pavers Together & Finish Walkways

Same spec class as #10 Screenings (AASHTO M43 / ASTM D448 No. 10) — blue-gray granite variant of the same gradation.

Blue-Gray Granite Dust is the quarter-minus by-product of crushing our native Boston-area granite — the fine material that packs to a hard, near-concrete-like surface when it gets the right moisture and a tamper. Hardscape installers sweep it into paver joints. Trail builders compact it as a finished walking surface. Horse owners spread it as low-cost arena footing. It's the unsung hero of any project where stone needs to lock together and stay put.

At a glance

What it's good for

• Paver joint sweep-in for natural stone and concrete pavers
• Compactable walkway surfaces on garden paths and trails
• Horse paddock and riding arena footing
• Top-finish over base layers on patio and walkway installs

How much do I need?

For a 4' × 25' garden path at 2" compacted depth, plan on about 0.6 cubic yards. A 200 sq ft paver patio with stone-dust joint sweep-in needs roughly 0.2 yards — just enough to fill the joints and clean up the surface. Always compact in 1" lifts when building a structural walking surface.

How Blue-Gray Granite Dust compares

• vs. #10 Stone Dust (standard granite): Same gradation, different color profile. Blue-gray has a steel undertone that reads cool; the standard #10 is the neutral gray.
• vs. Mason Sand: Mason sand is rounder and softer (used for mortar). Blue-gray granite dust is angular and locks under compaction — better for walkway setting beds.
• vs. Dense Pack: Dense Pack has a ¾" top stone plus fines. Blue-Gray Granite Dust is just the fines. Use dust to top a dense-pack base.
• vs. Concrete Sand: Concrete sand drains better and is the ICPI-spec'd paver bedding sand. Stone dust is the traditional joint-sweep material — different layer, different job.

Frequently asked questions

What is Blue-Gray Granite Dust used for?
Walkway setting beds, paver joint fill, top dressing on driveways, arena footing, and footing for stepping stones and flagstone. It compacts to a near-solid layer that locks the surface above it in place.

Is Blue-Gray Granite Dust the same as #10 screenings?
Same spec class (AASHTO M43 / ASTM D448 No. 10) — just the blue-gray color profile of the granite. Gradationally identical to standard #10 stone dust.

Does Blue-Gray Granite Dust drain?
Not well. The fines pack tight, so water sheds across the surface rather than percolating through. That's a feature for walkways (no settling) but a bug if drainage is needed — for drainage, use a clean stone instead.

Can I use Blue-Gray Granite Dust under pavers?
For dry-laid stepping stones and flagstone, yes — it is the traditional setting bed. For interlocking concrete pavers, contemporary ICPI guidance prefers concrete sand for bedding; stone dust is still used for joint sweep-in.

How much does a cubic yard of stone dust weigh?
About 2,700 lbs per cubic yard, or roughly 1.35 tons.

Do you deliver stone dust in the Boston area?
Yes — same-day and next-day bulk delivery across Suffolk, Middlesex, Norfolk, Essex, Plymouth, Bristol, and Barnstable Counties.

Same-day and next-day bulk delivery, no minimum order. We deliver across Middlesex, Norfolk, Suffolk, Essex, Plymouth, Bristol, and Barnstable County.

Pair with our dense pack ¾" to minus for the compacted base layer underneath, or our blue-gray granite ½" for the decorative layer alongside.

Order today — the compactable blue-gray fines that finish hardscape projects clean.

• Same-day & next-day delivery available — weekends fill fast, order early.
• Curbside or on-property drop — let us know at checkout.
• Up to 6 yds per load for dense materials (gravel, soil, rock, sand) — mulch loads carry up to 10 yds. Delivery is $100 per load within 30 miles of our Dispatch Office, plus $4 per mile beyond. No minimum order.
• Job site delivery available
• Questions? Call (617) 645-0987 or see full delivery info →