Originally Posted by joecaption
Why would you not just blow in the new over the batts?
Has everything been air sealed?
Has baffles been added so the soffit vents do not get blocked up?
Everything has been air sealed - I'm embarrassed to say that I've been working on this project off-and-on for a couple years.
The baffles have been added and insulation pushed in between the bottom of the baffle and the top plate to keep insulation from going down into the soffit. The top of the baffles are up high enough that nothing should get down into them. Some bays don't have baffles because they don't lead down to an exterior soffit.
I thought about pulling the fiberglass out of some of the bays so that the cellulose can get down into any gaps or air spaces that may be under or alongside the batts.
I also thought that the fiberglass should be pulled away from the floor near the soffit openings so that more cellulose will fit between the sheathing and the attic floor. But maybe that's the wrong way to do it (?).
It's an old farmhouse that was gutted a few years back and a large addition built on to it. The ceilings in the upstairs bedrooms were not level, so the old ceiling joists were left in place and new joists were put in to level everything off. So there are two sets of joists to insulate between and under. Some of them are side by side, but an inch or two from each other - old and new.
In the other end of the attic, the ceilings below were dropped about 6" or so with new joists, leveled and drywalled. But those joists crisscross each other - one set 6" above the other. I'll try to post a couple pictures.