Kitchen backsplash problem

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Old 07-11-17, 02:58 PM
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Kitchen backsplash problem

Hi everyone! I am tearing down an awful old tile backsplash in a kitchen on a new house purchase and it appears what is under it is plaster over a cement board. Any advice? My options I thought of is try to scrape the top coat of plaster off and save the cement board underneath. Option 2 is to replace the cement board with drywall. I don't want to take off the cabinets though and think option 2 might be problematic on matching the cement board with drywall and a seam? Any ideas? Help! Thanks in advance.
 
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Old 07-11-17, 03:21 PM
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Welcome to the forums!

Do you intend to put up a new backsplash? I'd scrape off what is loose and then smooth it out with a setting compound like Durabond.
 
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Old 07-11-17, 03:25 PM
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That is a great idea. Yes i am going to put up a new backsplash. Would you do the durabond then mortar the tiles over the durabond?
 
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Old 07-11-17, 03:44 PM
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Thinset can be applied over the durabond. It's possible you could use thinset alone, it all depends on how thick it can be used under the tile.
 
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Old 07-11-17, 03:55 PM
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Thanks mark. One last followup. As i removed the old tile it left a brownish adhesive. Not sure if that is old thinset or adhesive. It is sitting on the plaster. As I chiseled away at the tiles, the plaster would come off in some spots leaving my able to see the cement board underneath. How can i remove all the plaster efficiently to durabond it? Some of it doesnt want to leave the cementboard easily...
 
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Old 07-11-17, 04:44 PM
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A 3" wide stiff putty knife with a hammer used like a chisel to cut across the direction of the trowel lines to remove as much of the mastic as possible. It is tedious work but you need a smooth surface to retile. If using a setting type compound like Marksr suggests, I would prime and paint it before your tile application of thinset. You will get a better bond.
 
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Old 07-11-17, 04:58 PM
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Thank you. Very tedious indeed. I am chiseling right now. Great idea about the tile and paint before thinset. I would have thought the reverse. Thanks all!
 
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