Can I Put Sod Over Other Grass?

Suggested Preparation

• Since "successful sodding requires good soil-to-sod contact" notes the Colorado State University Extension, clear all grass, weeds and rocks from the area. Loosen the top four to six inches of topsoil with a rototiller, and consider adding at least three inches of topsoil to the area. Thoroughly incorporate new soil with existing soil, and then level the area with a rake. Use a roller and rake to smooth the area, but don't compact it too much. Water the soil until it is moist but not soggy. Lay the sod directly on the soil, not on any "existing dead or buried vegetation," suggests the University of Missouri Extension.

Considerations

• Although some lay people may tell you it's fine to install sod directly over existing grass, failure to properly preparing the area for sod is a potential problem, as the University of Rhode Island Horticulture puts it. Not following the suggested preparation techniques from your sod company may void any growth guarantee, resulting in a wasted money, time and effort for improperly growing grass.

Installation

• Install sod as quickly as possible to limit stress and encourage quick growth. Ideally, you should install the sod within 24 hours of it being cut at the farm. Keep sod shady and slightly moist until you have time to lay it.

  Stagger the sod pieces --- such as how a mason lays brick--- so that seams where the sod meets is less noticeable; this also helps limit water run-off. Place the sod tightly together to limit browning around the edges, and help the pieces grow together quicker. Start sod nearest walkways or straight lines and move outward to the farthest corner of your yard. Cut pieces as needed to fit, with a knife or sharp trowel.

Tips

• Water the newly laid sod until it is soaked, and water starts to run on the sidewalk, suggests JB Instant Lawn. Water the lawn every day for the next two weeks or until the sod takes root. Check for rooting by tugging on the corner of the sod. Don't fertilize or mow the lawn until the lawn is fully rooted and established.