For starters the soil might be crap. The lawn is a new lawn made by a cheap contractor for a new construction house. The builder used cheap soil and the result is just a ton of weeds. It looks to me like I would have to kill the weeds first and start over. How do i kill the weeds? Round up strong enough? How much round up would I need? My calculations say there would be 130 yds of soil if I wanted a 3 inch coat of top soil. This can be massively cost prohibitive. This job is a bit out of my scope, but the guy would like me to consider it. Can you give me some guidance?