Can I lay sod over my existing grass?

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: It will grow through and add to the new sod grass. Plus the area for new sod should be refurbished with top soil.

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: 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: No
Explanation: The best way to get your new sod to take root is to lay it directly on fresh soil. Air pockets like those that would exist if you layed it directly atop of another piece of sod, would allow the soil to dry out and burn up.

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: 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: No the soil must be prepared properly before any sod is installed.

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.