Wow, I just got back from a client's house and boy, was this customer's house nice.. I'm about to install sod in the front and rear of the customer's house, I'm going to post pictures of the new grass that I'm giong to be putting in. The lawn right now is full of weeds, moss, there were 3 big trees that covered the entire area and no sun was being shone @ the lawn.. its like 5,000 sq feet of sod for front and back, I'm just guessing but I'll post exact measurements and pictures.. I'm not sure if prep work is needed or if I need to bring in topsoil? If so, how much topsoil do i need to install the sod at? 1", 2", 3" of topsoil is necessary? or can I just use the existing soil?