Cape Cod style house in kansas city (all weather patterns) . Freezing upstairs that will probably cook in the summer. I have been scouring these forums and others how to fix this issue. I had been settled on a mooney wall on the 2×4 knee as i have the room. I planned on leaving the current insulation in place, if possible, to reduce material waste and cost. I found a dense packing machine (menards krendl 425 dual outlet), found where to buy the correct fiberglass (one of my local wholesale distributors) and had calculated how much material I needed. I have already started using rigid foam cut outs to air seal the floor joists with can foam to seal more. But someone recently just asked why I didn’t use rigid foam over the exsiting batt insulation instead of the mooney wall.

Is this the way to go? Again I have the room to get in and out. And can I leave the current batt in place and just put the rigid in top? Or should I remove the paper backing first?

Any information would be greatly appreciated. This project is making my head spin.