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336-790-1814
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Castle Grey
Reflecting the strength and resilience of a medieval castle, USI Castle Grey sandstone features a color range from light to medium greys with cool undertones. Known for its low maintenance, extreme durability, and timeless, classic design, it is available in Natural, Sawn & Sandblasted, and Tumbled finishes.
Castle Grey
Castle Grey
USI Castle Grey sandstone reflects the strength and resilience of a medieval castle, bringing a timeless and classic design to any project. This extremely durable, low-maintenance natural stone features a color range from light to medium greys with cool undertones, making it an elegant alternative to classic Bluestone. Available in multiple distinct finishes—including Natural, Sawn & Sandblasted, and Tumbled—Castle Grey delivers exceptional thermal resistance and non-slip performance, ideal for pool decks, patios, and outdoor living spaces. To maintain its appearance and ensure longevity, follow these essential care guidelines:
- We recommend sealing this product to best protect the color. Like your white T-Shirt, any stain on a lighter color stone will stand out. A quality sealant prevents those issues and makes routine cleanup a breeze.
- Sealing any natural stone used around a pool is highly recommended by USI. The chemicals and/or salts in pool water, as well as harsh cleaning chemicals commonly used on concrete can discolor or stain unprotected stone.
***USI recommends the application of a penetrating sealer on all 6 sides of this product, particularly if used around pools or on the ground in areas with limited drainage.***
Castle Grey
USI Castle Grey reflects the strength and resilience of a Medieval Castle. Its color ranges from light to medium greys with cool undertones. Its low maintenance and extreme durability make for timeless, classic designs. Offered in numerous applications, Castle Grey is a dependable choice for any project.
***USI recommends the application of a penetrating sealer on all 6 sides of this product, particularly if used around pools or on the ground in areas with limited drainage.***
Castle Grey - Fire Pits
Variation in Color: Low
Available Sizes: Inside Diameter 32.5” | Outside Diameter 48.5”
Available Thickness: 4″ Sawn
Edges: Sawn, Rockfaced, & Tumbled
Available Finishes: Sawn & Tumbled
Geology: Quartzitic Sandstone
Traffic: Heavy
*USI recommends the application of a penetrating sealer on all 6 sides of this product, particularly if used around pools or areas with limited drainage.
Castle Grey - Bench Kit
Variation in Color: Low
Available Sizes: 16×72 inch radius
Available Thickness: 2″ Calibrated
Edges: Rockfaced
Available Finishes: Natural Cleft
Geology: Quartzitic Sandstone
Traffic: Heavy
*USI recommends the application of a penetrating sealer on all 6 sides of this product, particularly if used around pools or ground areas with limited drainage.
Castle Grey - Circle Kit
Variation in Color: Low
Available Sizes: 9 foot Diameter
Available Thickness: 1″ Calibrated
Edges: Chiseled
Available Finishes: Natural Cleft
Geology: Quartzitic Sandstone
Traffic: Heavy
*USI recommends the application of a penetrating sealer on all 6 sides of this product, particularly if used around pools or areas with limited drainage.
Castle Grey - Stepping Stones
Variation in Color: Low
Available Sizes (in)*: 18×18
Available Thickness: 1″ Calibrated
Edges: Chiseled
Available Finishes: Natural Cleft
Geology: Quartzitic Sandstone
Traffic: Heavy
*Other sizes upon request
*USI recommends the application of a penetrating sealer for this product, particularly if used around pools or areas with limited drainag.
Castle Grey - Sills
Variation in Color: Low
Available Sizes (in)*: 3 x 36
Available Thickness: 2″ Calibrated
Edges: 3 Sides Sawn, 1 Long Side Rockfaced
Available Finishes: Natural Cleft
Geology: Quartzitic Sandstone
*Other sizes upon request
Castle Grey - Wall Caps
Variation in Color: Low
Available Sizes (in)*: 8×24 | 10×24 | 12×24 | 14×24
Available Thickness: 2″ Calibrated
Edges: 2 Sides Sawn, 2 Long Sides Rockfaced
Available Finishes: Natural Cleft
Geology: Quartzitic Sandstone
Traffic: Heavy
*Other sizes upon request
*Please note – Use of muriatic acid on this product may cause permanent discoloration or damage if the acid is not fully rinsed away with clean water.
Castle Grey - Pier Caps
Variation in Color: Low
Available Sizes (in)*: 24×24 | 26×26 | 28×28 | 30×30 | 36×36
Available Thickness: 2″ & 3″ Calibrated
Edges: 4 Sides Rockfaced
Available Finishes: Natural Cleft
Geology: Quartzitic Sandstone
Traffic: Heavy
*Other sizes upon request
*Please note – Use of muriatic acid on this product may cause permanent discoloration or damage if the acid is not fully rinsed away with clean water.
Castle Grey - Slabs
Variation in Color: Low
Available Sizes (in)*: 36×96 | 48×96
Available Thickness: 2″ & 3″ Calibrated
Edges: 4 Sides Rockfaced
Available Finishes: Natural Cleft
Geology: Quartzitic Sandstone
Traffic: Heavy
*Other sizes upon request
*Please note – Use of muriatic acid on this product may cause permanent discoloration or damage if the acid is not fully rinsed away with clean water.
Castle Grey - Steps
Variation in Color: Low
Available Sizes (in)*: 16×36 | 16×48 | 16×72 | 16×96
Available Thickness: 6″ Calibrated
Edges: 4 Sides Rockfaced
Available Finishes: Natural Cleft
Geology: Quartzitic Sandstone
Traffic: Heavy
*Other sizes upon request
*Please note – Use of muriatic acid on this product may cause permanent discoloration or damage if the acid is not fully rinsed away with clean water.
Castle Grey - Bullnose Coping
Variation in Color: Low
Available Sizes (in)*: 14×72
Available Thickness: 2″ Calibrated
Edges: 3 Sides Sawn, 1 Long Side Bullnosed
Available Finishes: Natural Cleft
Geology: Quartzitic Sandstone
Traffic: Heavy
*Other sizes upon request
*Please note – Use of muriatic acid on this product may cause permanent discoloration or damage if the acid is not fully rinsed away with clean water.
Castle Grey - Treads
Variation in Color: Low
Available Sizes
Available Thickness: 2″ Calibrated
Edges: 3 Sides Sawn, 1 Long Side Rockfaced
Available Finishes: Natural Cleft
Geology: Quartzitic Sandstone
Traffic: Heavy
*Please note – Use of muriatic acid on this product may cause permanent discoloration or damage if the acid is not fully rinsed away with clean water.
Castle Grey - Flagstone
Variation in Color: Low
Available Sizes
Available Thickness: 7/8″ & 1″ Calibrated
Edges: Chiseled, Sawn Cut, and Tumbled
Available Finishes: Natural Cleft, Sawn, Tumbled, Honed, Sandblasted
Geology: Quartzitic Sandstone
Traffic: Heavy
*Other sizes upon request
*Please note – Use of muriatic acid on this product may cause permanent discoloration or damage if the acid is not fully rinsed away with clean water.
The USI Dealer Advantage
Competitive Wholesale Pricing
Dealer-only rates that protect your margins
Reliable Inventory
We stock deep so you can fulfill orders without delays or backorders.
Consistent Product Quality
Our thickness consistency standard means fewer surprises and smoother installations.
Flexible Ordering
Order what you need, when you need it. No unreasonable minimums for active accounts.
Regional Coverage
Distribution across the Southeast and Northeast puts product closer to your jobs.
Dedicated Account Support
Real people who know your account and answer when you call.
Trusted by Dealers Across the Country
“USI embodies everything we want in a supplier, responsive, reactive to our needs, and Anthony has worked hard to build a great relationship. This is the kind of company we want to do business with.”— Jeff Griffith, Welsh Stone Supply