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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 - 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?

  • Are you allowed to use PT lumber for indoors framing in your area?? I doubt it. – Speedy Petey Apr 12 '16 at 0:10
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    @SpeedyPetey yeah. the problem was afaik only CCA PT wood which was arsenic. It was phased out and replaced with different type PT chemical which is allowed indoors. In fact - required for anything touching concrete. – Dannyboy Apr 12 '16 at 13:06
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In general, the codes require fasteners to be of hot-dipped, zinc-coated galvanized steel in accordance with ASTM A153, type 304 or 316 stainless steel, silicon bronze or copper. [source]

FWIW, everything you ever wanted to know about pressure treated wood here.

3

Stainless is the most reliable way to go, though hot-dipped galvanized is also an option. It wasn't an issue until CCA was phased out a few years back.

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    To spoil the linked article: they have to be hot-dipped galvanized. Electroplated-galvanized nails will corrode in pressure-treated wood. – stannius Apr 11 '16 at 22:32
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    To clarify further, they all corrode. It's a matter of coating thickness and longevity. – isherwood Apr 12 '16 at 13:19
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It sounds cliche, but your best bet is to visit a local lumber yard. Not only will they likely have what you need to go with the lumber, but more often than not, if it's a decent sized pro yard, they will have #1 grade cheaper than HD or Lowe's #2.

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