Thx, but I am trying to do this for zero $$.
Here is a pic of the ceiling after I flipped the insulation so the kraft paper was up:
There is 10" of depth in the cells formed by those joists, and this insulation only fills about half of it -- I'm thinking I may just put a double thickness in there, and then buy or "gift card" thicker batts for the rest of the cells.
The expansion spray foam can be seen over on the side, tho the 1st cell (bay?) has spray foam all over the edge.