All things being equal you may be better off overseeding now. Doing a pre-M regimen just delays things. The weeds seeds will still be in the ground when you stop the preM in order to overseed.

I would kill grass & weeds, seed, apply Tenacity then wait for that 30 day/2 mow (post germination) window then do Tenacity + Barricade.

Lots of people from Northern Virginia this week

Doing a pre-M regimen just delays things. The weeds seeds will still be in the ground when you stop the preM in order to overseed.

That is a common misconception! Pre-emergent does not technically prevent the seed from germinating, it messes with root development thus killing the freshly germinated weed seed and depleting the "seed bank". I've thought about watering lightly and frequently in mid-spring to cause the weed seed to germinate and get killed by the pre-emergent, but there's other consequences to the lawn, like fungus.

I would kill grass & weeds, seed, apply Tenacity then wait for that 30 day/2 mow (post germination) window then do Tenacity + Barricade.

I concur.

Ok - great, thanks for the feedback.

You say 'kill grass and weeds and then seed'.

What do you mean by kill grass? Do you mean I need to round-up all the crabgrass? I'm not quite clear. I certainly wasn't planning a full renovation.

I'm clear with the overseed now part obviously, but not exactly sure what to do first.

These photos might help. I can send better ones if needed - should give you an idea of the issues

They mean roundup everything

Thanks - so roundup the probably areas and reseed a week or so after once the weeds have died.......?