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Old 07-05-2013, 11:29 AM   #1
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mastic on drywall


I want to do a pebble backsplash trim on top of existing backsplash (granite) on my bathroom vanities. What so I need to do to the drywall before using the mastic? Do I need to seal it? It has been painted and the home is new, so there is no foreign matter on the walls.

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Old 07-05-2013, 12:23 PM   #2
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mastic on drywall


100% sure you really want to do that?
Going to be near impossible to clean.

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Old 07-05-2013, 02:40 PM   #3
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mastic on drywall


I have done it before. Maybe I didn't describe my intentions well: the pebbles/stones will go ABOVE the granite backsplash, about 4" high, directly on the drywall and will serve no other purpose than a decoration. I will grout around the stones as well. My concern was more about whether or not the moisture from the mastic will penetrate the drywall and cause problems. Last time I did this application I really did not consider the moisture in the mastic damaging the drywall. Thus, my quandary. I did this in a spa in my last house. Over the 7 years I lived there I did't see any problems, but the spa was not used very often.
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Old 07-05-2013, 03:02 PM   #4
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mastic on drywall


Tiling over painted drywall is fine---simply scuff sand the paint,lightly before proceeding.

You will be okay with mastic if the border is in a dry area--I prefer thinset as it sets faster and bonds better--

-you might investigate using a modified grout to set the pebbles,using the color you wish to grout the finished work---Youtube

has an excellent video showing that--(I lost the book mark,sorry) I have used that technique with stone mosaics with good success.
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Old 07-05-2013, 04:16 PM   #5
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mastic on drywall


I appreciate your input! I will go ahead with the mastic as planned. I will also check out the modified grout idea!
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Old 07-05-2013, 04:51 PM   #6
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mastic on drywall


That worked well with the picky little mosaics----
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Old 07-06-2013, 12:51 AM   #7
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mastic on drywall


Technically moisture will probably penetrate to the drywall through the paint, but it doesn't matter. Think of how much moisture penetrates the drywall when it's first installed - when joint compound is applied 3 times to bare drywall. Or think about how much moisture there is when paint is applied to bare drywall.
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Old 07-07-2013, 07:34 PM   #8
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mastic on drywall


You will no water in your drywall. First this is not like a shower it's a backsplash any water that hits it will be small amounts. Second that small amount of water will not go thru the tile then the mastic then the paint.

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