I'm re-framing my first floor and using PT wood everywhere where there is a possibility of area being flooded. 

PT wood is your [typical 2x4(s) from Home Depot MCA](http://www.homedepot.com/p/WeatherShield-2-in-x-4-in-x-8-ft-1-Southern-Pine-Pressure-Treated-Lumber-254258/202088114) - micronized copper azole chemicals. 

I guess I've never realized that PT lumber is corrosive. Which collated nails should I use in my framing gun? Stainless?