Don’t Lay Sod On Top Of Grass
Q: I know it likely is not good gardening, but is it permissible to lay sod over scalped existing grass?
A: You might lose a lot of sod if you do it your way. Those grass roots under the sod will dry out in a heartbeat if they are not touching the soil underneath. They can’t be “close to” the soil; they have to be touching something to wick water into the young grass plant. You could try rolling the sod, but damage from using a roller too much could be a problem. Do it right and till and level the area before laying sod.