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"Bob F" wrote in message
...
| Mayayana wrote:
| At 20 years old, it is probably the old PT wood, not the current
| stuff. Required fasteners are different.
|
|
| It is the old stuff. So I have resistant arsenic
| instead of whatever it is they're using now. (To
| this day I haven't been able to find out what the
| new "acq" is made of.)
|
| But that doesn't have anything to do with nails
| and screws.
|
| Really?
|
| The high level of copper in lumber treated with ACQ or CA speeds up the
| corrosion of most fasteners, so for decks or other outdoor projects made
from
| pressure-treated lumber, code requires the use of fasteners that offer
good
| corrosion resistance.
|

They both have copper. You said the required
fasteners are different for each. I've used mostly
plain galvanized nails with both and never seen
a problem.