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Galvanized lath on copper or
aluminum flashing
causes a transfer of metal that is
(somehow)
harmful to the flashing or the
stucco.
This is true- in plumbing. When a galvanized
pipe is coupled with a
copper pipe, a slow transfer of metal occurs that leads
to the pipe
leaking. This can be remedied by attaching a diode
connected to
both pipes to control the metal transfer. This diode (
or device)
needs to be replaced every so many years to assure
reliability.
There is no need for a pressure tight or water proof
seal between
the lath and the flashing. Galvanized lath doesn't
accelerate oxidation
on copper or other dissimilar metal.
PROOF: I examined several houses built in the 1920's
and
1930's that had copper flashing and galvanized lath and
stucco
and the original flashing was still in good shape.
I hear this all the time. I think it was started by the
EIFS people.
Lime in plaster etches glass
The plaster finish coat is lime and gauging plaster, or
mostly lime.
Lime does not etch or affect glass in any way.
What scratches
glass is a careless person scraping windows.
Romex (plastic insulated electrical wire) cannot be
plastered
over because the plaster has lime
that eats the plastic.
Lime does not eat plastic. Plaster base coat (brown
mortar)
has no lime at all, contrary to popular belief, but is
made from
gypsum and sand. Electrical channels, where grooves are
cut
into the old wall are generally patched with lime and
gauging
plaster (white mortar).
There are some dangers to doing this. With no conduit
to protect
the wire, someone may try to drive a nail in the wire,
damaging
the wire and creating a short. Also, with no conduit the
wiring
can't be changed in the future,
Lime is caustic, but it is alkaline, the opposite end
of the ph scale from
acid. Acid is sold in plastic jugs.
Lime doesn't eat plastic insulation on wiring. It says
it does in the
National electric code.
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