I have never heard of that kind of 'round-up' anyways I would use a pre-imergent, if you have weed seeds that might germinate after you lay the sod. roundup usually is taken in from the plant and goes to the roots, to kill it ?

If it's the RoundUp brand, read the label for effectiveness after rain, etc. RU only needs 2 hours to do it's job because it's a contact herbicide, but usually it doesn't affect the soil unless this particular product has another chemical added.

Giventake...
There's a link below with your name on it.

Here is a link that might be useful: A link for giventake

doh!, there is a risk. The extended control round up contains Imazapic, (the active ingredient of Plateau) which kills plants by inhibiting the production of branched chain amino acids. (not good for kbg or fescue, as a matter of fact plateau is used to control kgb and fescue). I probably would not want that in my soil if I was spending a lot of money for new sod.

You may want to wait until spring for sod. You could try to plant a cheap cover crop (annual rye, winter wheat, spring oats) in a couple months, to get you through winter. And then by spring - the imazapic would be gone and there would be no risk to the sod.

Would there be any chance that soaking the area numerous times would dissipate any chemicals in the soil? Are there any "counter chemicals that could be applied to offset the roundup?

Sorry for the goofy questions, I just really wanted to have the sod put down this fall if at all possible.

Thanks