This document provides design details for a 6.56 ft high stone masonry retaining wall. It includes the wall dimensions, material properties, and calculations...
Designing a stone masonry retaining wall requires a balance of structural integrity and aesthetic appeal. This example outlines the process for a gravity wall supporting a modest change in grade. The primary goal is to manage lateral earth pressure while ensuring the wall remains stable and visually pleasing within the landscape. A thorough analysis of site conditions is the essential first step.
The success of any retaining wall begins with a detailed site assessment. Engineers must account for the soil type, which in this example is a sandy loam with good drainage characteristics. The groundwater table is located several feet below the proposed base, significantly reducing the surcharge pressure on the wall. The calculated active earth pressure, using Coulomb’s theory, is approximately 25 pounds per linear foot, dictating the required strength of the masonry units and foundation.
For this design example, we specified medium-density concrete masonry units (CMUs) faced with uncoursed fieldstone. The CMUs provide the necessary structural strength, while the random-faced stone offers a natural, rustic appearance. Mortar Type S was chosen for its adequate compressive strength and flexibility, which helps accommodate minor ground movement. The use of local stone reduces costs and helps the wall integrate seamlessly with the surrounding environment.

The wall height is set at four feet, which is a practical limit for gravity stone masonry without significant reinforcement. The base width is calculated to be 30 inches, providing a favorable factor of safety against overturning. A key design feature is the inclusion of a 12-inch thick reinforced concrete footing, which distributes the load over a broad area of undisturbed soil. No additional tensile reinforcement was required within the stone courses due to the conservative safety margins achieved through the base width.
Preventing hydrostatic pressure is critical to long-term performance. The design incorporates a 12-inch diameter perforated PVC drain pipe behind the wall, pitched toward a collection point. A non-woven geotextile separates the drain pipe from the backfill to prevent clogging. In colder climates, the foundation footer must be placed below the frost line—in this example, 42 inches—to avoid heaving. A 6-inch layer of clean gravel backfill ensures water flows freely toward the drain.
Construction begins with excavation and base preparation, compacting the subgrade to achieve a stable working platform. The concrete footing is poured with keyways to ensure a strong bond with the masonry. Once cured, the first course of CMUs is set, carefully checking for level and alignment. Subsequent stone facing units are dry-laid in a functional pattern, avoiding continuous vertical joints. The core is compacted in 12-inch lifts as the wall progresses upward.

The finished wall demonstrates how structural necessity can align with landscape design. The irregular face stone creates visual interest, breaking up the mass of the wall. On the garden side, a smooth face aesthetic provides a clean backdrop for plantings. This design example proves that a robust, engineered wall does not have to be an eyesore. Proper planning results in a durable structure that enhances the property's value and curb appeal.
<strong>Stone Masonry Retaining Wall Design | PDF - Scribd</strong><p>This document provides design details for a 6.56 ft high stone masonry retaining wall. It includes the wall dimensions, material properties, and calculations</p>
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