On 2015-09-17, Mayayana wrote:

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.

Still, it's info one must wade through or perhaps miss a key point.

CCA = Chromated Copper Arsenate
ACQ = Alkaline Copper Quaternary

Both ar Pressure Treated Wood (PTW), the later replacing the former by
EPA dictate.

https://en.wikipedia.org/wiki/Alkali...per_quaternary

I'm still getting conflicting opinions on which are the best
fasteners. A retired gen contractor jes voiced his opinion that ring
shank nails are to be avoided. (sigh) 8|

nb