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Old 12-12-2005, 12:12 AM   #1
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Bathroom Remodel

I need some clarification on the proper method to tile my bathroom. I'm completely remodeling it, basically new everything. We added some new electrical and had to make numerous holes in the drywall. Long story short...the bathroom is going to get all new sheetrock. There is a tub shower and I'm going to be using 13 x 13" porcelain tiles with quarter-round trim to hide the unfinished edge of the porcelain tiles. For the quarter-round trim to work the tiles need to be elevated above the surrounding wall. Here's what I was thinking and tell me if this is on the right track. I was going to sheetrock the bathroom and use greenboard for the tub surround, keeping it elevated an inch or so from the tub lip, install 4 mil plastic over the greenboard draping into the tub lip, and then use 1/4" hardibacker as my tile underlayment. Is this an acceptable practice, will it hold up over time? Can 1/4" backer be used on the walls or should 1/2" hardibacker be used instead? What would be the acceptable method of spacing the tiles up enough to accomodate the quarter-round trim tiles? Or should I use 1/2" backer in place of the greenboard and then put 1/4" backer over that to help raise my tiles? Any help is appreciated

Last edited by RyanL; 12-12-2005 at 12:26 AM.
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Old 12-12-2005, 01:20 AM   #2
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Hi Ryan, welcome! You don't need to put the greenboard in then cbu, just the 1/2" cbu will be fine with the poly behind it.
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Old 12-12-2005, 07:50 AM   #3
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Welcome, Ryan.

No advantage to the MR board (greenrock) in that application, plain sheetrock would be fine. You can do as you suggested if you want the mud-wall look with the quarter-round edges. The quarter-inch Hardi would be technically acceptable for your purpose. Hardi rates their quarter-inch board for use alone on 16" centers. But I don't know that it would raise your tile enough to accommodate your trim. You may find that half-inch CBU would work better.

Of course, mud would be the very best option.

My opinion; worth price charged.

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