Can you lay sod over existing grass?
There are differing opinions about this topic, which is why you should talk to a sodding professional near you to find out if it’s possible to lay sod over your particular lawn. In some cases, it might be possible. For example, some professionals say the new sod will kill the existing grass underneath and release nutrients that will benefit the new sod.
However, others believe the old grass will disrupt the sod's ability to take root in the soil, and it will die due to a lack of nutrients.