The main purpose of a retaining wall is to help protect a home that is built on a slope. However, different types of walls use different methods to offer such protection. Retaining wall contractors in Los Angeles typically build a concrete retaining wall with solid concrete blocks and steel reinforcements. Such walls are built at a 90-degree angle on a specific place on the slope that can offer the most support. These concrete blocks are able to stop much, if not all, of the water, debris, and other substances from running on to your home. Basically, the pressure that builds up from run-off on the slope can cause the soil that is holding up your home to become loose and unstable, but a retaining wall can stop all the pressure that your house would normally have to take from these substances.