GOFFSTOWN NH, RETAINING WALL REPLACEMENT
On this small retaining wall project in Goffstown NH, Anchor Diamond Block was used to re-stabilize the parking area on the side of the driveway. The original retaining wall installed many years ago by the homeowner had failed. We reused the existing block for our buried footing courses, and installed the new Diamond Block on top of the old block which was still in excellent condition. We then installed 3/4″ stone and a 4″ drain pipe behind the Diamond Block. The existing sandy gravel fill was used as our infill soil behind our column of 3/4″ stone. The infill soil was compacted in 3″ to 5″ lifts to attain the NCMA specification of 95% Proctor Density. Geogrid was placed every 18″ to help stabilize the infill soil. Sonotubes were installed every 6 feet for a future fence installation. A flat shelf was built at the toe face of the wall. Stone was placed on the shelf and below it on the slope, to prevent erosion of the existing soil.