"- Colonel -" wrote in message
news:2005120820183475249-nobody@verizonnet...
They now use copper compounds in pressure-treated wood (they used to use
something else...arsenic or something like that?).

Anyway, the copper in the pressure-treated wood eats away at the aluminum
in a galvanic-corrosion reaction. I believe you also now have to use some
kind of corrosion-resistsant fasteners with modern P-T wood because plain
old nails (and I think even galvanized) will corrode away to nothing in no
time.

Correct. Stainless steel is the preferred fastener. www.mcfeelys.com has a
lot of information about it.