Rendering over nails

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Ralphpell

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Hi folks. I've got a question about if nails will stain through krender. Im building an extension and I've got a guy to come and krend it. I said I would cement board the dormers for him to render over.

I initially used stainless screws but found it was a fine line between them holding or pulling through the board. I decided to crack on with it today but bought some galvanized nails to try instead.

I found that they held the board alot better, so I got stuck into it and boarded 3 of the dormers, on closer inspection i noticed that the galvanizing was chipping off the nails. I just wanted to know if this would be a problem in regards to stain coming through the render from them corroding or am I overthinking it? Thanks in advance
 
Stainless or zinc screws are best but now it's done put some insulation tape over the heads to give you peace of mind
 
Yeah the plaster said he was going to put a mesh on first. Tried getting hold of him today but no luck. Thanks for the reply.
 
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