i have a couple clients that i am going to need to overseed come late summer/fall. The houses are both new and in developments where they had one company do all the work and therefore everything came out SHITTY! alot of cheap seed was used and had alot of weeds in it, many bare spots etc... Well the best option is to overseed the entire yard to get it in full and thick. Ive never overseeded, we have installed alot of new yards, but never something like this. I was gonna get a dethatcher to get rid of the excessive amounts of straw they put down then seed it over. I want to know if there are any ways to calculate the amount of seed needed for this or any tips? i usually put down 4-5lbs of seed per 1000 sq. feet in new installs.