Can I lay sod over my existing grass?

Answer: No
Explanation: You must remove or till the original sod and top dress with good topsoil before laying new soda

Answer: No
Explanation: It is not recommended to lay sod over existing grass, as the roots from the new sod will have a harder time establishing as there is less contact area for the roots. The new sod will completely cover the old sod, which will provide no benefit for the new sod and can lead to a less than desirable outcome. Further, water drainage capabilities will be reduced until the sod fully establishes.

Answer: No
Explanation: No. If you want a beautiful long lasting lawn. A sod removed or rototiller your existing lawn before laying new sod. Preparation is everything in new sod installs.

Answer: No
Explanation: There could be fungus in your old grass weeds growing up, or if you did this it could simply not give your new grass a soft and loose ground to begin to form a root system.

Answer: No
Explanation: We wouldn’t recommend it. While it seems like a great idea, layering sod on top of existing turf isn’t likely to fare well. We can see why you’d think it could be a good strategy – like laying landscaping fabric, sod could starve existing grass for sunlight and effectively kill off the original layer. As professional turf layers we know that’s a recipe for a ruined lawn, for a variety of reasons. Turf needs to be able to grow roots quickly to become established after sod is laid. To do so, it needs additional soil. The original layer of grass will form a barrier that makes it difficult for roots to establish.

Answer: No
Explanation: The new grass never rooted. ... You can't simply lay sod on top of grass without doing proper preparation. “All sod must make soil contact to root,” she points out. “Therefore, the existing grass / lawn must be extremely sparse or you will have to bring in dirt and put it on top before laying the new sod

Answer: Yes, but you need to cut the grass to the level of the dirt
Explanation: but it will not provide the best result.

Answer: No
Explanation: “All sod must make soil contact to root,” Therefore, the existing grass / lawn must be extremely sparse or you will have to bring in dirt and put it on top before laying the new sod. Additionally, the grade is extremely important; the water flow must be proper.

Answer: No
Explanation: You would need to kill the existing grass with round up and wait for two weeks or so, then till the area, add stater fertilizer and lay the sod.

Answer: No
Explanation: Sod needs to be installed over prepared soil. This means all weeds, debris, and old grass should be removed. The soil should then be pulverized, raked, and rolled before installation of new sod.

Answer: No
Explanation: Existing surfaces need to be removed first and the soil properly prepped and graded and I highly recommend installing an automatic irrigation system to guarantee the sod installation.