How To Lay Down Sod Over Existing Lawn. Lay your first strip in the longest straight section of your yard. If you leave any solid clumps, it could kill the grass beneath it.
The sod compresses the grass and limits its exposure to sunlight and water. The main nutrient that the dead grass layer provides is nitrogen. Smooth the soil with the shovel to make it.
After you remove the top layer,you'll need to bring in topsoil and grade.
In order to do this, your sod needs to have contact with the soil beneath it. Not all of the grass seed will germinate and because the seed is relatively cheap, throw more of it down to compensate for the seed that won’t germinate. Use a rotary till to make the job easier and faster. Applying sod directly over grass is advantageous because it requires less work.