This layer is used for bedding the first row of wall blocks. Bedding sandĪfter compacting, spread a 1-inch layer of coarse sand or ¼-inch minus gravel. This is very important! The base should be so compact that, when you walk over it, it doesn't shift at all. Using the appropriate type of compactor for your site size (either powered or hand-operated), level and compact your base material. The base should be so compact that, when you walk over it, it doesn't shift at all. Next, compact it and level it using either a hand or mechanical compactor.Ī 6-foot piece of 2 x 6 along with a level is useful for screeding the base material to make it level. Lay a 4- to 6-inch layer of the crushed base material in the trench. Round rocks, such as pea gravel, roll and dislodge under pressure resulting in failure of the retaining wall. The various-sized crushed gravel with the fines helps ensure the right amount of compaction. The base material should only consist of angular, sharp-edged particles such as ¾-inch minus gravel. Make sure that your trench is level and compacted. This provides strength and stability to your retaining wall. They should be buried about 1 inch deep for every 8 inches of wall height. Dig a trench for the bottom row of blocks. Preparing the base where the first layer of block will be placed is critical to building a well-placed, stable retaining wall. When installing a curved retaining wall, use a garden hose and spray paint to mark and map out the curved radius. Map out and measure your layout using stakes and string pulled tightly. The size of your wall depends on the size and shape of the space you have. You may need to consult an experienced installer, particularly if your retaining wall is over 4 feet high. Plan your project for the site where the retaining wall will go.
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