Re: Sod over ground out tree stump?
It is a common misconception that spraying weed killer is beneficial when planting anew. In actuality, all you're doing is killing the green leafy things on the surface, you've done little to the root systems and nothing to all the seed that will be brought up to the surface when you rototill. On top of that, the weed killer will stay in the soil and stunt the growth of both sod and seed, seed being the more susceptible of the two. It is best to scarify the surface with the tiller then rake the weed and other debris out. After that, rototill to the desired depth, add a good layer of organic matter such as compost or manure and work that fully into the soil. From there it's a matter of grading and leveling the soil as desired. If you're installing or repairing the irrigation system, do it before grading and leveling.
Once the ground is prepped, use a lawn roller to compact it a bit and water the bare ground just enough to moisten the top few inches without making mud. Roll out your sod, roll again with the lawn roller and then water in with the irrigation system.
When using sod you can gently use the yard almost immediately, after a month or so you can just about do anything you want. If seeding, you'll have a long road ahead of diligent watering to keep everything moist and you won't be able to be on it for months.
I suffer from CDO ... Its like OCD, but in alphabetical order, LIKE IT SHOULD BE!!!