corners for cement board

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  #1  
Old 08-28-12, 10:21 PM
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corners for cement board

just wondering what kind of corners to use for a fireplace made of cement board.
Nailing the corner pieces like the ones used in drywall wont work because it will damage the corners of the cement board.
pre drill and small screws?
I plan on mudding the cement board and painting it when done...
 
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  #2  
Old 08-29-12, 04:09 AM
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What is behind the cement board?? If you put sheetrock back there, you negated the purpose of the cement board. It is a combustible product next to a firebox. I would remove the cement board and the sheetrock behind it, embed the cement board to the studs and sheetrock around it, making everything flush.
 
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Old 08-29-12, 07:32 AM
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Sheetrock on top of the drywall would have been my suggestion.
 
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Old 08-29-12, 08:08 AM
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You could do cement board directly on studs and then 1/4" drywall to laminate. Or just install tile/stone facing over cement board which will give you a better look then drywall and will take more abuse from the heat, etc.
 
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Old 08-29-12, 08:20 AM
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its cement board on metal studs....
 
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Old 08-29-12, 08:27 AM
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I would do a tile facing then. If you want to spend extra, do a stone type finish or something that will mesh well with the rest of your house.
 
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Old 08-29-12, 03:07 PM
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The first straight on shot did not help our 3d minds. I see the relief in the other pictures. You only need the cbu out from the fireplace 4 or 5". I would have restudded to accommodate this and sheetrocked the remainder if you plan on painting. I, too, would tile the face and sides. You may not get the paint job you plan on. I have never painted cbu, so let's wait to see what Marksr has to say. A nice mantel to top it all off, and it would be cool.
 
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Old 08-29-12, 03:17 PM
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If you completely cover the cement board with a setting compound, you should be able to prime and paint without any issues. How well the mud is applied [and sanded] will determine how well the paint job will look. About the only possible issue would be if the cement board next to the firebox gets hot enough to melt/bubble the paint
 
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Old 08-29-12, 04:10 PM
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Out of my expertise but why not metal corner bead the same as you use on Sheetrock and mud over it.
 
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Old 08-29-12, 06:39 PM
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I agree with Ray, use metal corner bead.

That or cover with stone or tile.
 
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Old 08-30-12, 01:02 PM
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my first option was to tile, but cant really find the right tile and can later when i do.. for now id like to paint. so how to attached the metal corner bead to the CB without cracking the corners of the CB?
 
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Old 08-30-12, 02:33 PM
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I prefer nails but you could set the corner bead in wet setting compound [like durabond] Once the mud is dry the corner bead should stay in place.
 
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Old 08-30-12, 05:47 PM
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I have also stuck tape/bead down with spray glue like 3M's super 77
 
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Old 08-31-12, 04:55 AM
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Would spray adhesive work as porous as the cement board is? Maybe if you sprayed the glue, let it dry, sprayed again and then set corner bead ??
 
  #15  
Old 09-12-12, 12:22 PM
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What did you end up doing?
 
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