Vapor Barrier Under Wood Floors

I'm installing a wood floor on a plywood sub floor over concrete. My home is in south florida. Do I need to install any kind of vapor barrier and if so what should in be? Sub floor is 5/8 CDX , hardwood is 3/4. Thanks

 

The National Hardwood Org. recommends for wood over concrete installation 3/4" thick plywood or 2x4" sleepers for up to 4" wide boards. 4" plus should have plywood on slab or sleeper system with aditional nailing surface. Polyethylene moisture barrier is recommended beneath the concrete slab and again over the subfloor. Asphalt felt is also used beneath hardwood over subfloor.

Once you get your wood, make sure you let it acclimate for several days in the area where it is to be installed. Your HVAC should be running. The wood needs to adjust to the temperature and humidity levels of your home before installing.

Keep us posted on your progress!