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Hi, I have some parging to do on my house and this is the biggest bad spot I have. There is a missing patch of wire mesh and the material behind it is some kind of asphalt shingle-like fake brick stuff which moves a bit when I press against it.

Should I just install a piece of wire mesh in there before applying a layer of self-bonding cement? If so, how should I attach the wire? Or is there a better alternative?


Photo on 2012-12-03 at 5.11 PM by Whippersnapper12, on Flickr
 

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Going by the rust on your lath, you should probably just tear it all off and start over. At the least, you need to cut it back to non rusted lath.
 

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At least cut more of the concrete back to expose the lathe.
Like any patch job, even drywall, you need to spread it out and blend it in to make it disappear,

I would use a 4" grinder and a diamond wheel on it to cut back the concrete to where the wire is solid. Cut with grinder and break out with hammer.
Seems like all the rust would be right where the opening is and where water got in.

Then attach new wire to solid wire, just because old wire turned brown, I would not say is unusable for a patch job.
Either way you want to open it up to bury new wire and not just nail it on surface over old hole.
 
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