I bought some hot-dipped galvanized nails for use in a project to build
an elevated walkway around the building shown here
<http://www.davidillig.com/observatory15.shtml . (I'm moving the dooraround to the back of the building.) I noticed right off that the
slightest off-center hammer blow would bend the nails I bought. I might
not be Tom Silva, but when I hit a nail with a hammer it usually drives
home. After too many bent nails I examined the nails. Where they bent
the zinc peeled off revealing aluminum beneath. I also noted that
hammer blows caused the nail heads to shed some zinc in nails that did
What the ~!? I think these nails are sub-standard because they bend
easily and because the zinc can peel. They are not suitable for use in
today's pressure-treated lumber.
I've never seen nor heard of galvanized Al nails -- I suspect they're
simply a very soft steel import. What does the box say?
On the subject of nails I'm finding harder to get decent quality nails
any more, even from the "real" lumber or hardware stores.
That can be checked with a magnet.
Aluminum is amphiprotic, that means it reacts with both bases
and acids. But because it naturally forms a very tough oxide
(saphire), pure aluminum is naturally corrosion resistant
to anything that cannot penetrate that oxide layer. Concentrated
Nitric acid is routinely shipped in aluminum vessels. But dilute
nitric acid would eat through them.
Anyhow, IIRC the copper compounds used in AQC treated lumber
will eat through the oxide and corrode aluminum. But unless I
am mistaken, it eats through zinc too,. The best metal to use
with AQC lumber woudl probably be bronze--very expensive.
Copper plated steel would be my. possibly naive, first choice.
I use those for things like white vinyl siding and trim, as they won't
ever create rust streaks.
I don't think aluminum nails were ever intended for PT wood.
** http://www.bburke.com/woodworking.html **
If Al, that sounds like a gutter nail...what the heck are you nailing w/
A google found what I knew of--galvanized Al panel stock, but nary a
single hit of "galvanized" in combination w/ "Al" and "nail" except
where both Al and galvanized nails were referenced.
From what you've said you're right, they're not suitable for use with
Aluminum fasteners are not to be used.
Galvanized nails must meet the ASTM A-153 standard. This usually means
double hot dipped (at minimum).
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