Joining backerboard with drywall

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Old 09-23-08, 04:31 PM
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Joining backerboard with drywall

I'm reaplacing about 4' section of wall in the bathroom where it go wet.... I removed the lower 4' section of the wall (old drywall)- Top 4' of the drywall is in tact and fine. Since that bottom portion of the wall tends to get wet more (kids!)- I wanted to make the bottom half tile. Before I do anything with tile- Can I make the bottom half of the wall backboard?
This will mean I will have to join the one piece of backboard to the existing drywall- (then I will tile over the backer)-
Is this doable- or should I install the green sheet rock instead and tile over that? What is recommended to use to join the 2 materials as in tape?
 
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Old 10-21-08, 09:22 AM
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Cement board is the preferred substrate for tile. It comes in 3'x5' sections. Greenboard would be ok, assuming this isn't a tub or shower area.

You can use a mesh tape set in durabond or thinset to tape the joints although many just tile over them. Shouldn't be a problem unless a grout joint lies on a backer board joint.
 
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