On 09/17/2015 3:28 PM, 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.)

Alkaline Copper Quaternary (also known as ACQ) treatment is made up of
copper, a bactericide and fungicide and a quaternary ammonium compound
(quat) which acts as biocide.

It is, ime, mostly ineffective as compared to CCA which is, generally,
less effective than creosote (at least for posts in ground in this area).

But that doesn't have anything to do with nails
and screws.

Not sure what the above means, but--

ACQ, CA, ACZA and CCA all require hot-dipped(*) galvanized nails or
stainless steel nails and screws. Fasteners should meet the ASTM A-153
specification for hot-dipped galvanizing. 304 or 316 stainless steel is
good, some other common SS, "not so much". But note, don _not_ use
galvanized fasteners with SS connectors.

Aluminum should not in direct contact with these products.

(*) Electroplated/electro-galvanized and mechanically galvanized
coatings are _not_ equivalent to hot-dip galvanized. It requires Class
55 or higher mechanical galvanizing to be equivalent (per ASTM B695).

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