Be sure the cellulose has air movement (not just behind a baffle) above it to dissipate any moisture it gains; http://www.buildingscience.com/docum...+in+flat+attic
Just add f.b. in the tight areas to get a higher R-value per inch, then Roxul as cellulose will slide down (as you can't dense-pack it) leaving weak areas. ADA the ceiling drywall also.
Clothes taking longer to dry?
Clean the dryer screen in HOT water if using fabric softener sheets.
They leave a residue that impedes air-flow, costing you money.
Clean the ducting in the last six months? 17,000 dryer fires annually!