Gravity Walls


Gravity walls rely on the mass of the blocks to withstand the pressure of the earth. Without the need for reinforcement, it’s where Redi-Rock launched the industry of large, precast modular blocks in 2000 and continues to lead the way.

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Why Choose a Gravity Wall?


Because it will allow you to...

Achieve Tall Heights

The massive weight of the blocks and patented knob and groove technology provide the resistance to hold back the earth to achieve design heights over 20 feet (6 meters) in certain scenarios without tiebacks.

Residential home with a ledgestone texture gravity wall

Maximize Usable Space

Without the need for geogrid reinforcement and the excavation that comes along with it, you can construct walls closer to property lines, opening up more usable space.

Installing ledgestone texture block

Install Quickly with a Small Crew

With a properly-rated piece of machinery, crews of two to three can lift and set 5.75 - 11.5 square feet (0.5 - 1 square meters) with each block. That adds up fast!

Commonly Used Blocks in Gravity Walls


With solid and hollow-core blocks ranging in weight from 1160-4,840 pounds (530-2190 kg) and width from 28-96 inches (710-2440 mm), Redi-Rock can help optimize designs and speed up installation for tall gravity walls.

41in (1030mm) Planter Block

The Planter Block provides the largest batter option available in the Redi-Rock system, extending the setback to 16 5/8in (422mm). Planter blocks can be combined with other elements of the system to create the perfect solution for the site demands.

41in middle block

A mainstay of the Redi-Rock system, this block has been around since the beginning. 41in (1030mm) solid blocks are also available as top, bottom, and half block varieties.

28in Top block

Without the knobs on top of the block, grading and landscaping up to the wall is easier. 28in (710mm) blocks are also available as middle, bottom, and half block varieties.

28in PC block

While PC blocks shine in reinforced walls, they also are frequently used in gravity wall scenarios. The center core slot is filled with crushed stone, eliminating 4% of the concrete while maintaining much of the retaining capacity as a solid block.

60in Bottom block

The massive weight of 60in (1520mm) blocks makes them great for building tall gravity walls. 60in (1520mm) blocks build taller gravity walls and streamline installation.

41in Hollow Core block

A newer element in the Redi-Rock system, this hollow-core block helps reduce concrete used by 28% while maintaining much of the engineering capability of solid 41in (1030mm) blocks.

52in Hollow Core block

At twice the height of standard Redi-Rock blocks, XL blocks provide more surface area with each one installed. The hollow-core design reduces the weight of the blocks while providing more width to build taller gravity walls. And, they integrate with the rest of the system.

72in Hollow Core block

Originally positioned to help build even taller gravity walls, engineers have found that XL blocks help streamline and optimize walls of all heights. The hollow-core design can help reduce the cost per square foot.

96in Hollow Core block

The 96in (2440mm) width of the largest XL block creates tons of potential for tall gravity walls in tight spaces.

41in 9in Setback block

When the standard 5 degree batter isn't enough to get the job done, the 9in (230mm) setback can help maintain gravity walls where there isn't room for geogrid and excavation. 41in (1030mm) 9in (230mm) setback blocks are also available in bottom and half block varieties.

41in (1030mm) Planter Block

The Planter Block provides the largest batter option available in the Redi-Rock system, extending the setback to 16 5/8in (422mm). Planter blocks can be combined with other elements of the system to create the perfect solution for the site demands.

41in middle block

A mainstay of the Redi-Rock system, this block has been around since the beginning. 41in (1030mm) solid blocks are also available as top, bottom, and half block varieties.

Don’t see what you’re looking for? Check out the entire Redi-Rock block library to view all the products available to help you solve your problems.

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Gravity Wall Case Studies


Detention Basin Capacity Doubled in Houston Redevelopment Project

As part of Houston’s Memorial City Redevelopment Authority’s plan to improve traffic flow on Lumpkin Road, the capacity of the existing detention basin needed to be doubled. By using Redi-Rock 9-inch (230-millimeter) setback blocks supplied by Wilbert Vaults of Houston, engineers were able to overcome the tight footprint and poor soil conditions, while also meeting the project’s budget and schedule. Gravity walls helped the new L-shaped detention basin achieve a depth 19 feet (6 meters).

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Two Highway Projects Save £16 million Using Redi-Rock Retaining Walls

After being approved by the United Kingdom's Highway Authorities Product Approval Scheme (HAPAS), Redi-Rock made its debut on two sections of smart motorway upgrades in 2020. Contractor Kier Highways and engineer Jacobs Atkins Joint Venture chose Redi-Rock gravity walls from Marshall’s CPM in order to avoid land acquisition and meet the varied demands of the project, while also providing £16 million in verified efficiencies for the 2.9 kilometers (1.8 miles) of retaining walls.

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Yellow excavator in front of Redi-Rock XL wall

XL Blocks Help Achieve Heights Over 25-feet (7.5 meters)

When the excavation for a cut wall at John C. Tune Airport in Nashville, Tennessee, opened up a geotechnical can of worms, it was time to go back to the drawing board. The design team paired up the software and agility of the product line to solve the problems uncovered. The wall used over 800 XL Hollow-Core Retaining blocks from Redi-Rock of K.I.T. to overcome the unstable fill material and shorter than expected limestone rock cut, reaching a maximum height of 25.5 feet (7.8 meters) with the new gravity wall.

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Available in Great Textures


With the appearance of natural stone, people will have to do a double take to realize it's concrete.

Block texture faces

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Gravity Wall Construction Details

From solid to hollow-core blocks, to batter angles, to site scenarios, the gravity wall construction details help you visualize the problem solving potential of Redi-Rock no matter what your project entails.

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Mock up of engineering construction details

Want to Know More About Gravity Walls?

From roads and bridges to developments and residential applications, thousands of projects have used Redi-Rock gravity walls over the years. Watch the video to learn more about the Redi-Rock system and how a gravity wall might help you solve your site scenarios.

Can Redi-Rock Solve Your Problems?

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"Because we used this tall gravity wall, the excavation was minimal, and we saved probably 80% of the trees on top of the hill."

Greg Bickford Sycamore Township