I'm preparing my floor to install new 3/4" solid hardwood flooring. I started off ripping up the old carpet and 5/8" particleboard. That left the 1/2" plywood subfloor.

**My plan is to lay down new 1/2" plywood underlayment above the 1/2" plywood subfloor.** I've read so many conflicting descriptions on the best approach—**mostly around whether to screw into the joists or not.**

* **Should I nail or screw?** (My gut says to screw.)
* **What size fastener should I use?** If not going into the joists, I'm not sure I can find 1" decking screws.