SienaStone® Smooth


Granite Blend

Granite Blend

Wall Products Only



Light Grey

Light Grey

Midnight Charcoal

Midnight Charcoal

Special Order Colors
Light Grey

Light Grey





Minimum quantities and special pricing may apply. Contact us for more details.

Custom Options

Custom Colors and Finishes
With so many different options for customization we ask that you contact your local Unilock Representative for more information about customizing this product.
Minimum quantities will apply.

Shapes & Sizes

Wall Standard 375

120 cm x 18 cm x 37.5 cm

47.25" x 7.125" x 14.75"

Corner Unit 375

120 cm x 18 cm x 37.5 cm

47.25" x 7.125" x 14.75"

Coping 383

120 cm x 18 cm x 38.3 cm

47.25" x 7.125" x 15.125"

48" Step

120 cm x 18 cm x 50 cm

47.25" x 7.125" x 19.625"

72" Step

180 cm x 18 cm x 50 cm

70.875" x 7.125" x 19.625"


Custom Colors
May be available for this product. Minimum quantities will apply.
Garden Wall
Retaining Wall
Seat Wall
Surface Texture
Smooth Premier


Unit Thickness Sq. Ft. Bndl. Sq. Ft. Layer Sq. Ft. Stone Layers Bndl. Ln Ft Sec. Soldier Ln Ft Bndl. Soldier Sq Ft Ln Ft Soldier Ln Ft Sec. Sailor Ln Ft Bndl. Sailor Sq Ft Ln Ft Sailor Units Sq. Ft. Lbs Bndl. Lbs Sec. Units Bndl.
Wall Standard------------3546-9
Corner Unit ------------1944-3
Coping Unit------------3555-9
48" Step50-----------3242-6
72" Step50-----------1596-2

Notes: 48" and 72" step 2 edge details on the same unit (Chamfer and Rounded). Siena Smooth corners are sold together as double units, one left and one right. All measurements are nominal. Contact Unilock for more information.


For cross sections, please visit https://www.risistone.com/product/sienastone/.

Important Information

Unilock, through Risi Stone® Systems International, can provide preliminary site engineering for most commercial projects. Soils information, site drawings, and loading requirements are some of the information details required in order to provide this preliminary site engineering. Contact your local Unilock Representative for details.

Want help calculating your order?
Use our interactive paver calculator to get quick, easy and accurate specifications for your project!

Paver Calculator


ASTM C 1372 Standard Specifications for Dry-Cast Segmental Retaining Wall Units

Conforms to:

  • C140 for Absorption and Compressive Strength > 3000 PSI
  • C1262 for Freeze Thaw Durability <1% mass loss
  • C1372 Overall dimensional variations permissable for width, height and length ± 1/8” (±3.2mm)

Unilock standards exceed 6,000 PSI for SienaStone products with:

  • 4% absorption avg.
  • 5% absorption max.
  • Dimensional Accuracy +/- 5/64” (±2.00mm)

Test results available upon request



Materials & Resources: LEED V4:

Building Product Disclosure and Optimization

Sourcing of Raw Materials – Sourcing of Raw Materials and Extraction • 1 point

Sourcing of Raw Materials – Leadership Extraction Practices • 1 point

Material Ingredient Reporting – Material Ingredient Reporting • 1 point

Material Ingredient Reporting – Material Ingredient Optimization • 1 point

Environmental Product Declaration • 1 point