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Old 01-25-2014, 01:51 PM   #1
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prep before backsplash


I am installing a glass mosaic back splash over a torn sheet rock.

What do I need to do for surface preparation?

Thank you for your assistance.

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Old 01-26-2014, 09:48 AM   #2
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prep before backsplash


Rip out the sheet rock and install cement board. You can use a multi tool or another similar device and just cut it out above the counter and below the cabinets. Cut the cement board to size and install. Then use thinset, not mastic, on the tile. Be best to use white thinset if the glass has no backing.

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Old 01-26-2014, 10:52 AM   #3
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prep before backsplash


You could skim coat the rough board with multipurpose tape joint compound---you need a flat surface---cement board is nice--but not really required in a back splash area----------

As to the adhesive? White thinset---or even premixed white mastic--if the tile manufacturer does not have specific requirements---it's not a wet area,so mold growing in the mastic is unlikely---
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Old 01-26-2014, 11:04 AM   #4
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prep before backsplash


Yeah, you can still use drywall, I'm just one to usually over engineer everything I do Honestly though, the time spent doing the skim coat (application and dry time), you could still just rip out the drywall and easily install new for $10. I'd just hate for the bond to break and the tile get screwed up. Just make sure you use color matching caulk between the tile and the counter top, don't grout it.
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Old 01-26-2014, 03:51 PM   #5
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prep before backsplash


Excellent point about the time spent skim coating---

Removing and replacing the drywall might be faster----
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Old 01-26-2014, 07:42 PM   #6
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prep before backsplash


In most kitchen remodels I do I end up cutting out the drywall between the base and upper cabinets if there was tile on the wall already. While the wall is open, it's a good time to add wiring if needed for under cabinet lighting, over the range microwaves, etc. Also a good time to check the heights and locations of existing switches and outlets in the tile area. Many times the height varies, good time to even everything up. About the only time I'll skimcoat with dry mix mud is when I run into plaster walls where year out would make a big mess. Thinset is a better way to go.
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Old 01-28-2014, 12:37 PM   #7
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prep before backsplash


When I tiled my backsplash the badly damaged sections of drywall I cut out and replaced with fresh drywall, and parts that were nicked up a little I skim coated. I primed all the drywall and then installed the backsplash with mastic. As mike pointed out, it sees little/no water so the convenience of mastic is welcome.

I just ripped out the walls for a tub and it was tiled on green board. Surprisingly the sheetrock looked good.. Cement board seems like overkill for a backsplash imo.
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Old 01-30-2014, 07:27 PM   #8
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prep before backsplash


I usually just remove it and replace with drywall. No tape or anything and use pre-mixed mastic with a 1/8 v-notch trowel.

Multimaster/fein tool works but a sharp utility knife works too. Try not to cut into the vapor barrier but if you do, fix it with tuck tape.

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