I have Insulated AC flex duct work in my attic. Am I correct in that since its insulated already if I lay insulation over the duct work it is fine as long as the duct work is sealed properly? I have R11 4' x 100' rolls and it might be difficult to get the entire roll under the flex ductwork. I could cut the rolls down and line them up but was hoping for one continuous roll out.
You can cover the ducts with more insulation -- just make sure to mark where they are, and provide a way for the HVAC tech to access any dampers, etal.
(Sidenote: given your location, an unvented, insulated compact roof could very well be a better bet -- this makes the attic part of the conditioned space, and eliminates the hunt for duct leaks.)