Long-Term Settlement Prevention & Landscape Integration
Because the Sandy Springs homeowner planned to construct a high-end stone patio with a built-in stone fire pit, preventing any subgrade soil settlement was the top priority. Any soil settlement beneath a heavy masonry patio would lead to cracked mortar joints, uneven stone surfaces, and standing water. To ensure structural stability, we imported a clean structural sandy clay loam that matches the native Georgia clay's load-bearing properties but has lower plasticity.
We compacted the soil in thin 6-inch lifts to achieve a certified 95.8% Modified Proctor density. Furthermore, we integrated a subgrade drainage system: a French drain consisting of 4-inch perforated PVC pipe wrapped in geotextile fabric and surrounded by washed granite gravel was routed around the patio boundary. This drain redirects stormwater runoff away from the home's foundation and into a dry well located at the lower end of the yard, ensuring the patio remains dry and stable during the heavy rainstorms common in Sandy Springs and North Georgia. This layout was coordinated with Sandy Springs environmental inspectors to ensure full alignment with local watershed runoff guidelines. Our geotechnical consultant, Sarah Jenkins, P.E., supervised the density testing to verify that compaction met all structural design specifications.
