I am planning to install some flooring in our attic for storage purposes, but want to ensure a) I have enough support, and b) I don't sacrifice insulation.
I currently have 2x4 joists 16" OC, in which I've laid R13 batts. As this is not sufficient in either regard to simply lay down a floor, my plan is to cross (perpendicular) the existing joists with 2x6 on end (14' pieces would run wall to wall in the section I'm flooring), secured with toe-nails and simple hurricane brackets. Then lay R21 within those bays, which would get me up to R34...enough for my climate. Finally, I'd put down my 3/4" T&G plywood on the new 2x6.
Does anyone see any issues with this? Or have any better ideas?