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Re: Rust in stucco
How old is that house?
The expanded metal lath is supposed to have been corrosion protected such that that should not be happening for a very long time.
It is also quite likely, in fact 'most probable', that the stucco/metal lath/drainage plane at all incorrect (because few are installed correctly - starting with the building wrap, then the lapping of the paper and metal lath over each other, followed by the attachment of the lath, and ending with the proper application of the stucco).
Frequently, the lath is either upside down or rotated at a 90 degree angle or just rotated off the horizontal to match the slope of the roof on gable ends - expanded metal lath is required to be, it is designed and intended to be, installed horizontally on vertical surfaces, and with the right side 'up', not 'down'.
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