ROMANSTACK™ | Unilock Contractors
Your region
The antiqued face of RomanStack makes it a more rugged-looking alternative to Split ‘n Stack, an economical, light-duty garden wall system for planters and borders. With rock face textures on both sides, it works well for two sided structures like firepits or small seat walls. Straight or curved applications are easily constructed with this reversible wedge-shaped unit.
Shape and size

200mm x 100mm x 200mm
7 7/8" x 3 7/8" x 7 7/8"

200mm x 100mm x 200mm
7 7/8" x 3 7/8" x 7 7/8"

200mm x 100mm x 200mm
7 7/8" x 3 7/8" x 7 7/8"

200mm x 100mm x 200mm
7 7/8" x 3 7/8" x 7 7/8"

Fire Feature e1632317154571
Fire Features
Garden Wall e1632317150577
Garden Walls
Outdoor Kitchen e1632317137972
Outdoor Kitchen
Water Feature e1632317028508
Water Features
Technical information
  • Packaging
  • Things to know
  • Cross Sections
Select category
  • Packaging
  • Things to know
  • Cross Sections
Layers per BundleLin Ft per Bundle - SailorUnits per BundleUnits per LayerUnits per FcFtLbs per LayerLbs per BundleLbs per UnitLin Ft per Layer - SailorFcFt per LayerFcFt per BundleFcFt per Unit
Layers per Bundle6
Lin Ft per Bundle - Sailor94.4898
Units per Bundle144
Units per Layer24
Units per FcFt4.64513
Lbs per Layer392.808
Lbs per Bundle2356.848
Lbs per Unit16.367
Lin Ft per Layer - Sailor15.7483
FcFt per Layer5.1667
FcFt per Bundle31.0002
FcFt per Unit0.21528


RomanStack is the most versatile residential and commercial retaining wall block on the market today. Use RomanStack to construct projects from low walls to high walls.

Applications – Design and build projects such as planters, seat walls and fire pits. Can be used for straight and curved installations. (Minimum Outside Radius 29”’)

Capacity – Gravity walls up to 24” (.5m).

Recommended Base Stabilization – one layer of DriveGrid stabilization grid between subgrade and base material. Use under Standard Base or Permeable Base.

Standard Base – Min. 6” – 8” of ¾” Crusher Run gravel (any road base standard in accordance with ASTM-D2940) compacted to 98% Standard Proctor Density (SPD).

Alternative Permeable Base – Min. 6” – 8” of ¾“ clear open-graded stone compacted to achieve full particle lock-up and consolidation. (Clear open-graded does not compact but does consolidate slightly by rattling the particles together.)

Leveling – Leveling retaining wall blocks directly on top of gravel is tedious and generally does not yield the best results. U-Grip Base units or universal base pads are recommended under all Unilock walls for improved accuracy and speedier installation. Additional benefits include long term structural integrity and an overall better appearance. Poured concrete leveling pads, reinforced with rebar, are also a great way to accomplish leveling, particularly for larger installations. You must ensure that the concrete is poured and finished perfectly in order to achieve a good visual appearance.

Connection – features a tongue and groove connection. Use appropriate concrete adhesive for connection between units where the key has been removed or for corners. Always read adhesive manufacturers’ directions prior to gluing.

Handling – No specific handling instructions.

Coping - This wall requires coping. Use the RomanStack Coping or use any other coping that Unilock manufactures. Cutting may be required. Install with tight joints or gap 3/16” and amend with an exterior latex caulking. A diamond blade saw is required to cut coping properly. Glue all coping using a specially formulated concrete adhesive that is strong and will not break down over time. Always read adhesive manufacturers’ directions prior to gluing.

Download Technical Sheet
Why Unilock products are top tier

Dave Caroselli from Shearer Patio & Landscape Services explains why being creative in the hardscape industry is something that he enjoys and why he feels that Unilock product is top tier in the industry. He also talks about how the UniLyft system has helped him efficiently complete a project with speed and precision.

Dave Caroselli
Shearer Patio & Landscape Services
Unilock products and service – best in the industry

Leon Raber from Creative Hardscapes talks about the quality and innovation of the Unilock product, and the wide range of color tones available. He also explains how he is most impressed with the contractor service provided by Unilock, and how the support makes him feel like family.

Leon Raber
Creative Hardscapes
Tournoux Landcare on why they choose Unilock

Zack Tournoux, one of the owners of Tournoux Landcare Service, shares why they love Unilock paving stones and walls: Top tier products, exceptional catalog (magazine), great working relationship with Territory Manager.

Zack Tournoux
Tournoux Landcare Service
Unique Technologies
Design trends rise and fall, but for something to be considered classic it needs to be both timeless and elegant. No two words could better describe the Unilock Classic paver. Available in a wide variety of shapes and styles, Classic pavers are made using a proven manufacturing process—blending cement, colors, and stone aggregates into a single batch and distributing the mix throughout the finished paver. This ensures a uniform look that is strong but capable of being formed into the wide variety of styles Classic is known for.
500+ Dealers
Across North America
Where to Buy
Unilock has an extensive network of dealers with deep knowledge of our products.
Find a Dealer
Pool Installers – Expand Your Business with Hardscape
Like most pool construction companies, you’re always looking to increase your bottom line. Maybe you’ve considered hardscape installation in the past. Maybe you’ve even tried it, only to suffer losses and issues.
3D Landscape Design: Is it time to add it to your toolbox?
A meticulously hand-rendered landscape design plan is incomparable to anything else. The ability to draw every detail, from the smallest plant to the largest water feature, is a skill that creates functional works of art that, up until recently, drew customers. Today, however, landscape design has joined the rest of the design world: technology is king. As competition in the landscape industry becomes fiercer, owners are looking for anything that can help set them apart. 3D design is a great opportunity to do just that.
Skip to content