I plan to install 3/4" oak hardwood in my living room and dining room. The subfloor is 5/8" plywood with 2x8 16" span joist. I am going to nail down 3/4" hardwood to the subfloor directly since 5/8" plywood subfloor meets the minimum subfloor requirement. Am I right? Second question, When I nail down the 3/4" hardwood to the subfloor, should I nail to the joist or avoid it?

Thanks.

Nail into the joists. The plywood sub floor will deflect under pressure and will create squeaks as the nails begin to lose their grip.

Glenn www.consultationdirect.com

well you are correct 5/8" is the minimum...why not play it safe and add a layer of plywood or osb (about 1/2") lay it out in the other direction of your existing sub floor....good luck