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Discussion Starter #1
Hello,

I am redoing my fireplace (ave zero clearance fireplace insert). I removed the tile and built a frame around my fireplace. I am installing fake stone (concrete fake design).

I installed 1/2" Duroc cement board onto 2x4 frame using plastic cap nails.

Will this cause me issues down the road with corrosion. They are plastic washers with eletrogalvanized nails.

It is holding no problem and it is a small job, 5 feet wide by 8 feet tall. But I have since read that you need hot dipped galvanized. This is rustic fake stone so the need to be completely smooth is not an issue. My concern is, why this fall apart five or ten years form now from the mortar corroding the nails.

Thank you.
 

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Naildriver
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First, the 2x4 framework adjacent to the firebox must be of metal studs, not flammable wood. Next, use the proper fasteners for the 1/2" cbu. 1 5/8" Backer screws should be used. Remove the roofing cap nails as they have no place in this installation. It may fall apart in 5 years probably NOT because of the rust, but because of the holding ability of the nails on a vertical surface.
 

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Discussion Starter #3
First, the 2x4 framework adjacent to the firebox must be of metal studs, not flammable wood. Next, use the proper fasteners for the 1/2" cbu. 1 5/8" Backer screws should be used. Remove the roofing cap nails as they have no place in this installation. It may fall apart in 5 years probably NOT because of the rust, but because of the holding ability of the nails on a vertical surface.
Thank you. Looks like I am going back to Lowe's. Got these because I'm doing it myself and thought they may be easier to hang it but oh,well. It will definitely not be coming down after I add screws.

The wood frame is fine, this is a zero clearance firebox. The house frame is within six inches of the fireplace and before I removed the tile (tile was adhesive to the fireplace and drywall) the drywall was right up to the firebox. The dry wall was destroyed (up to the frame) so I had to have a local fabricator make a metal surround to close the gap. So, if I am missing something here please let me know because from what I researched zero clearance are right next to combustible materials and my frame is actually father away them the drywall was.
 
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