Thanks for the insulation recommendation Stovelier. I will definitely follow thru on that. The tips on how to do it are appreciated.
There are quite a few YouTube videos of what to do. I pulled up the insulation (batts between the joists), sealed, put the batts down, and added (unfaced) batts 90 degrees rotated on top.
Blown in stuff has a way of going places.it should not go. Okay to use, but be aware.
Make sure any chimney pipe has a clearance of 2" to any combustible, and that includes fiberglass. Use sheet metal and silicone (=non-combustible) to close gaps in the ceiling around chimney pipes.
Close chases.(e.g. for ductwork). Many times they are left open, creating a square foot sized hole thru which your warmed air disappears.
All this sealing is also good for your stove; air rises in a home, as in a chimney. And you don't want lower pressure near your stove because there are holes thru which the air can rise and disappear into the attic. This could result in smoke roll out.
So, sealing the attic is good for heating costs, but also stove operation.
If you have soffit vents,.make sure to not obstruct them with the extra insulation; the air coming in there should be able to rise along the plywood on which the shingles are nailed.
And correct any electrical issue you run into as you're not going to want to mess up the insulation for that after you added all that. I found many issues (junctions not in boxes, fans mounted on non-fan boxes, poorly mounted boxes, wiring with damaged insulation, etc ).
/End of this tangential subject..