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Splash blocks are a part of your home's roof drainage system. They sit at the ground end of your downspouts and help direct water away from the foundation. Splash blocks are commonly made of concrete, but can also be found in plastic. They generally are rectangular in shape with a shallow trough. They work by giving water that gushes from the downspout a place from which to disperse, rather than just making a rut around the base of your foundation.
Splash blocks are important in helping your drainage work as efficiently as possible. Though many downspouts have curved ends to direct water away from the structure, splash blocks add an additional encouragement for rain water to get away from your building. Without an adequate drainage system, including splash blocks, rain water will accumulate where it falls off of the roof. Often this is near your foundation, causing water to seep in a home's basement and walls.