Galvanized lath on copper or
causes a transfer of metal that is
harmful to the flashing or the
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
both pipes to control the metal transfer. This diode (
needs to be replaced every so many years to assure
There is no need for a pressure tight or water proof
the lath and the flashing. Galvanized lath doesn't
on copper or other dissimilar metal.
PROOF: I examined several houses built in the 1920's
1930's that had copper flashing and galvanized lath and
and the original flashing was still in good shape.
I hear this all the time. I think it was started by the
Lime in plaster etches glass
The plaster finish coat is lime and gauging plaster, or
Lime does not etch or affect glass in any way.
glass is a careless person scraping windows.
Romex (plastic insulated electrical wire) cannot be
over because the plaster has lime
that eats the plastic.
Lime does not eat plastic. Plaster base coat (brown
has no lime at all, contrary to popular belief, but is
gypsum and sand. Electrical channels, where grooves are
into the old wall are generally patched with lime and
plaster (white mortar).
There are some dangers to doing this. With no conduit
the wire, someone may try to drive a nail in the wire,
the wire and creating a short. Also, with no conduit the
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.