Risi Stone

What Risi Stone does

Risi Stone Inc. is the inventor and original patent holder of the Segmental Retaining Wall (SRW) system, founded by brothers Angelo and Tony Risi in the late 1960s. The company designs, patents, and licenses SRW product systems — dry-stacked, interlocking concrete block walls featuring a continuous tongue-and-groove interlock — that range from hand-placed residential units (15+ lbs) to machine-placed colossal civil engineering systems (400+ lbs, up to 1,750 lbs per block). The product portfolio spans five aesthetic categories: Modern (ZenWall, PisaEdge, PisaSmooth, PisaXL Smooth, SienaEdge, Architextures, SienaSmooth), Natural (Rivercrest, FlagStack), Classic (StackStone, Pisa2, PisaXL, ConcordWall, PisaLite), Antique (RomanStack, RomanPisa, RomanWall), and Colossal (SienaStone, SonomaStone, DuraHold, DuraHold2). Engineering support is delivered through an in-house team of Professional Engineers using branded Vespa.RS MSE Design Software and AWall.RS CAD Tool developed in partnership with Callide Technologies.

The company operates as a pure licensing business, having divested its Gormley, Ontario manufacturing plant to Unilock Ltd. in 1995. Revenue is generated primarily through licensing royalties paid by a network of 12+ concrete manufacturers across Canada, the US, and Australia — including Unilock, Barkman Concrete (licensed since 1982), Oldcastle APG, Basalite, Mutual Materials, Shaw Brick, CP Concrete, Ideal Concrete, Dura-Sales/Faddis, and Erosion Control Systems. Risi Stone also provides engineering design services (feasibility studies, sealed engineering drawings, quantity take-offs) and a web-based Wall Estimator tool to support licensees, engineers, architects, landscape architects, and end customers. Customers include government transportation agencies (GO Transit, York Region VIVA, City of London), residential developers (Centron Residential), and healthcare/commercial end users (Southlake Healthcare Center). The company is family-owned, headquartered in Newmarket, Ontario, with 11-50 employees, and has no disclosed outside equity, debt, or M&A activity.

Name

Risi Stone

Legal name

Risi Stone Inc.

Website

https://risistone.com

Company type

Private

Founded year

1970

Operating status

Operating

Headcount range

11–50 employees

Short description

Risi Stone Inc. is a family-owned Canadian IP-licensing company that invented the Segmental Retaining Wall system and licenses patented interlocking concrete wall product lines to concrete manufacturers across North America and Australia, serving engineers, architects, landscape architects, and government infrastructure clients.

Ownership category

akta.pro rank

Product category

Retaining Wall Systems

NAICS

Concrete Block and Brick Manufacturing (327331), Architectural, Engineering, and Related Services (5413), Concrete Pipe, Brick, and Block Manufacturing (32733)

SIC

Concrete Products, Except Block & Brick (3272), Services-Engineering Services (8711)

akta.pro primary industry

Retaining Wall Blocks & Segmental Wall Systems (IMADABAJ)

akta.pro secondary industries

Concrete Pavers, Hardscape & Retaining Wall Systems (IMADAAAE), Geotechnical Design, Engineering & Consulting (Analysis, Design, Peer Review) (IMAFAOAK)

Keywords

• Segmental retaining walls
• Concrete block systems
• Retaining wall licensing
• Civil engineering materials
• Hardscape construction products

Headquarters

HQ city

Toronto

HQ country

Canada

HQ region

North America

Offices1 record

Markets served

GTM type

B2B

Offering type

Hardware or Manufacturing

Cost components

Personnel, Technology or R&D, Marketing or Sales, Operations, Others

Revenue model

1. Licensing Royalties: Risi Stone generates revenue through licensing agreements with concrete manufacturers who produce and sell the segmental retaining wall systems. The company transitioned from manufacturing to a pure licensing model in 1995.

Go-to-market motion1 record

Distribution channels1 record

Marketing channels4 records

Core offering

Risi Stone Inc. operates as a licensing company that develops and licenses patented Segmental Retaining Wall (SRW) systems to concrete manufacturers across Canada, the US, and internationally. The company provides engineering design services, branded software tools (Vespa.RS, AWall.RS), marketing support, and technical resources to licensed manufacturers, engineers, architects, landscape architects, and designers specifying retaining walls for residential, commercial, and heavy-duty civil engineering projects. The portfolio spans hand-placed residential systems (15+ lbs) to colossal machine-placed systems (400+ lbs), supporting walls from under 1m to over 15m in height.

Product overview

Risi Stone Inc. is the inventor and pioneer of the Segmental Retaining Wall (SRW) system, established in the late 1960s. The company operates as a licensing entity rather than a manufacturer, licensing its patented wall systems to concrete producers across North America. The product portfolio spans five distinct aesthetic categories: Modern (ZenWall, PisaEdge, PisaSmooth, PisaXL Smooth, SienaEdge, Architextures, SienaSmooth), Natural (Rivercrest, FlagStack), Classic (StackStone, Pisa2, PisaXL, ConcordWall, PisaLite), Antique (RomanStack, RomanPisa, RomanWall), and Colossal (SienaStone, SonomaStone, DuraHold, DuraHold2). These range from hand-placed residential systems (under 40 lbs) to machine-placed heavy-duty civil engineering systems (400+ lbs). Software tools include Vespa.RS MSE Design Software and AWall.RS CAD Tool (both developed with Callide Technologies), plus a Wall Estimator tool. Engineering services encompass feasibility studies and sealed engineering drawings. The company serves engineers, designers, landscape architects, and contractors across Canada, US, and international markets.

Differentiator

Problem solved

Functional benefit

Brands

• PisaStone: Original segmental retaining wall system patented in the late 1960s, manufactured in wet-cast molds with attractive split concrete face
• SienaStone
• DuraHold
• DuraHold2
• SonomaStone
• Pisa2
• Rivercrest
• Architextures
• ZenWall
• SienaEdge
• SienaSmooth
• PisaEdge
• PisaSmooth
• PisaXL
• ConcordWall
• StackStone
• FlagStack
• RomanStack
• RomanPisa
• RomanWall
• PisaLite

Products and services

• ZenWall Modern segmental retaining wall with monochromatic color palette and two-sided finish creating light and shadow mosaic effect; suitable for free standing and retaining wall applications with random appearance without pins or clips.
• PisaEdge Innovative segmental retaining wall system with sleek modern aesthetic featuring optimally sized blocks for swift installation with contractor-friendly features; supports both battered and vertical orientations.
• PisaSmooth Segmental retaining wall system with linear modern aesthetic providing fast, efficient installation; features ability for both battered and vertical orientation configurations.
• PisaXL Classic wall system for grade changes in landscape and garden projects, maximizing functional space for patios, terraces and parking for residential or commercial applications.
• PisaXL Smooth Modern update to PisaXL block offering contemporary appearance with 3-degree near vertical batter and universal corner block serving as both left and right corners.
• SienaEdge Complete segmental retaining wall system offering linear modern aesthetic with multifunction block design integrating standards and corners into same block for efficient installation.
• Architextures Modern aesthetic retaining wall system with crisp edges and clean linear appearance designed for contemporary spaces; engineered for demanding landscape challenges up to 8m height.
• SienaSmooth Modern retaining wall system combining stability of large modular units with exceptional versatility and flexible design details for residential and commercial applications.
• Rivercrest Natural landscape wall system offering true look and character of natural dry-stacked flagstone wall with integrated alignment system for simple installation; suitable for garden, retaining and seat walls, steps, planters, and fire features.
• FlagStack Natural flagstone-look wall system with patent pending design featuring mixture of real flagstone textures on front and back of units for natural random stone appearance.
• StackStone Classic wall system with natural beauty, versatility and simple installation featuring smooth beveled edges and rock face texture for clean elegant lines; ideal for free-standing patio walls and edging details.
• Pisa2 Original classic block SRW system with versatility, structural stability, simplistic installation and contractor-friendly design features; handles grade changes for patios, terraces and parking.
• ConcordWall SRW system with built-in setback design automatically forming correct slope for highly stable retaining wall; uses tapered components for curved walls and steps.
• PisaLite Lightweight modular concrete retaining wall system for stabilizing and containing earth embankments; based on PisaStone principles developed in 1970s with multi-piece system for sweeping curves.
• RomanStack Weathered version of StackStone manufactured through specialized process that rounds edges and corners for worn cobble appearance resembling real stone; designed for garden walls and free-standing patio walls.
• RomanPisa Antiqued version of Pisa2 with worn cobble appearance created through specialized process making it look like aged natural stone; can be substituted for any Pisa2 application.
• RomanWall Split and weathered-looking SRW system with distressed appearance giving impression of decades-old installation; versatile for straight or curved walls, planters and steps.
• SienaStone Large-scale segmental retaining wall combining stability of large modular units with exceptional versatility; can be designed as gravity wall (up to 4m) or geogrid reinforced wall (over 12m).
• SonomaStone Revolutionary machine-placed system combining design aesthetics, economics and efficiency with split-faced multi-block facade; tapered half units allow tight curves and flowing alignments.
• DuraHold Colossal segmental retaining wall system (0.55m squared per unit) ideal for demanding industrial, commercial and water applications; smooth texture reduces water flow friction and ice adherence.
• DuraHold2 Economical version of DuraHold with reduced block depth (326mm vs 600mm); ideal for lower walls or less demanding commercial and industrial applications.
• Vespa.RS MSE Design Software Branded version of Vespa MSE Design Software developed in partnership with Callide Technologies; offers retaining wall design functionality with entire Risi Stone product line loaded for engineers and design professionals.
• AWall.RS CAD Tool CAD tool allowing accurate representation of plan and elevation views of retaining walls on grading plans, accounting for variable heights, wall batter and wall width.
• Engineering Design Services Professional engineering services including preliminary feasibility studies, comprehensive engineer-sealed engineering drawings with quantity take-offs and full calculations, delivered by in-house team of Professional Engineers.

Quantifiable outcome

• SienaStone wall at Maple GO Transit showed maximum movement of only 3mm-4mm on 6m height wall - within measuring tolerance
• +2 more outcomes

Named customers5 records

Segments4 records

Ideal customer profiles5 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature4 records

Partnerships

13 partnerships are on record, tiered core and minor.

• Unilock Ltd.coreOEM/ Whitelabel/ Licensing Partner · 1 January 1995Acquired the Gormley manufacturing plant from Risi Stone in 1995 and continued manufacturing Risi Stone products under licensing agreement. Expanded throughout Ontario and US to become premier hardscapes supplier.
• Barkman ConcretecoreOEM/ Whitelabel/ Licensing Partner · 1 January 1982First licensing agreement established in 1982 with Barkman Concrete in Western Canada. Barkman has been a licensee for over three decades, manufacturing Risi Stone retaining wall products.
• Expocrete ConcretecoreOEM/ Whitelabel/ Licensing PartnerLicensed manufacturer that produced SienaStone products for the Fort McMurray Eagle Ridge Subdivision project.
• Com-Con Paving Stone Ltd.minorImplementation/ SI/ Consulting PartnerAlberta's premier commercial wall builder with 40+ years experience. Installed over 5,500 sq.m of SienaStone walls in Fort McMurray project, completing 15% under budget.
• Callide TechnologiescoreTechnology or IntegrationSoftware development partnership to offer branded Vespa MSE Design Software (Vespa.RS) and AWall CAD Tool. Vespa.RS includes the entire Risi Stone product line for engineering design.
• Oldcastle APG (Canada West)minorOEM/ Whitelabel/ Licensing PartnerLicensed manufacturer of Risi Stone products in Canada West region.
• BasaliteminorOEM/ Whitelabel/ Licensing PartnerLicensed manufacturer of Risi Stone products.
• Mutual MaterialsminorOEM/ Whitelabel/ Licensing PartnerLicensed manufacturer of Risi Stone products in the Pacific Northwest region.
• Shaw BrickminorOEM/ Whitelabel/ Licensing PartnerLicensed manufacturer of Risi Stone products in Canada.
• CP Concrete ProductsminorOEM/ Whitelabel/ Licensing PartnerLicensed manufacturer of Risi Stone products in Canada.
• Ideal ConcreteminorOEM/ Whitelabel/ Licensing PartnerLicensed manufacturer of Risi Stone products.
• Dura-Sales | FaddisminorOEM/ Whitelabel/ Licensing PartnerLicensed manufacturer of Risi Stone products.
• Erosion Control SystemsminorOEM/ Whitelabel/ Licensing PartnerLicensed manufacturer of DuraHold products in Australia.

Scale indicators3 records

Recent moves7 records

Expansion highlights4 records

Direct peers

• Unilock: Premier North American hardscapes manufacturer, and a core Risi Stone licensee since acquiring the Gormley plant in 1995. Sells SRW products alongside pavers under both Risi Stone-licensed and proprietary lines, making it a hybrid partner/competitor.
• Belgard / Oldcastle APG: National hardscape producer (part of CRH/Oldcastle) manufacturing segmental retaining walls, pavers, and outdoor living products. Both a licensee of Risi Stone in some regions and a direct competitor with proprietary Anchor wall systems in others.
• Expocrete Concrete Products: Alberta-based concrete products manufacturer and Risi Stone licensee, producing SRW blocks (including SienaStone) plus pavers and precast products for Western Canadian markets.
• Barkman Concrete: Western Canada's largest concrete manufacturer and Risi Stone's first licensee (since 1982). Manufactures and distributes Risi Stone-licensed SRW products alongside its own branded hardscape lines.
• Keystone Retaining Wall Systems: One of the largest SRW manufacturers in North America, producing concrete segmental retaining wall blocks with pin/clip and interlocking systems. Directly competes with Risi Stone's Pisa2 and SienaStone lines in the same engineer-spec channel.
• Mutual Materials: Pacific Northwest masonry and hardscape manufacturer and Risi Stone licensee producing retaining wall blocks, pavers, and brick products for residential and commercial markets.
• Redi-Rock: Manufacturer of large wet-cast modular concrete retaining wall blocks used in heavy civil, shoreline protection, and commercial projects. Competes head-to-head with Risi Stone's Colossal (DuraHold/SienaStone) product family in infrastructure and water applications.
• Basalite Concrete Products: Western US and Western Canada concrete manufacturer producing segmental retaining walls, pavers, and masonry products. Risi Stone licensee and a competing regional SRW producer.

Emerging players

• Anchor Wall Systems (legacy): Historical SRW pioneer now integrated into Oldcastle APG/Belgard; its Diamond and Vertica block systems were among the first commercial SRW alternatives to Risi Stone's PisaStone in the late 1980s.
• Nicolock Paving Stones: East Coast US manufacturer of pavers and segmental retaining wall systems targeting landscape contractors; competes with Risi Stone-licensed blocks in residential and light commercial specifications.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat5 records

Key risks6 records

Key highlights7 records

Customer concentration

• LinkedInlinkedin.com/company/risi-stone

Revenue estimate

Valuation estimate

Number of profiles

Profiles2 records

Funding overview

Funding rounds

Investors

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about Risi Stone