![]() Moisture can remain behind a retaining wall long after the runoff is gone. If your property requires a higher wall you have two options: you can have the wall specially designed by an engineer or you can use a series of 3-4 foot walls to create a terraced effect. This height provides excellent strength without requiring anchors, cantilevers or other additional reinforcements. Typically, residential retaining walls are built between 3 and 4 feet high. HeightFourth, it's important to know that the height of a retaining wall determines the load it can bear and how much extra reinforcement will be necessary.And third, is to ask if weep holes will be needed to allow water to drain through the wall. Second, is having a perforated pipe installed along the inside, or backfilled, bottom of the wall. First, is to make sure your landscaping contractor backfills at least a foot of space behind the wall with gravel. There are a number of ways to ensure proper drainage of water from behind a retaining wall. When drainage goes unaddressed hydrostatic pressure will build up behind the wall and cause damage such as bulging or cracking. DrainageThird, since most retaining walls are impervious, which means water cannot pass through the wall itself, efficient drainage is crucial.If you intend to do landscaping behind the wall, a 6+ inch layer of native soil should also be placed over the gravel fill. Compacted native soil can be used to backfill the rest of the space behind the wall. In order to provide proper drainage, at least 12 inches of granular backfill (gravel or a similar aggregate) should be installed directly behind the wall. Backfill refers to the dirt behind the wall. ![]() BackfillSecond, a retaining wall must have properly compacted backfill.Crucial for supporting the rest of the wall, a good base is made of compacted soil and at least a six inch layer of compacted sand and gravel. The taller a wall is, the further below ground level it should be set. The base of a retaining wall should be set below ground level. Block manufacturers as well as experienced contractors and engineers stress the importance of starting with a good base. BaseFirst, a retaining wall must be built on a suitable base.This drawing shows a cross-section of a 4' retaining wall.
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