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Old 09-11-2010, 01:36 PM   #1
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Greenboard to Backer Board

OK, so we completely gutted our bathroom, rewired, moved plumbing,and have hung our drywall ceiling and all our backer board and greenboard. We are going to tile a tub surround since our tub is the width of our bathroom and has a window on the back wall. We put our backer board up the height and width that we want our tile to go out, and green boarded the rest of the walls. We are getting ready mud and tape the green board and are stuck on how to finish the seams where the backer board meets our drywall. Can anyone help us on how to seal this seam? Any suggestions on trimming out the tile other than spending a fortune on bullnose tile would be greatly appreciated too!


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Old 09-11-2010, 05:48 PM   #2
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Bullnose tile is the usual way. Otherwise, you would use the frame for tub doors to close the edge, and seal with a good Silicone caulk. A picture would help to see what you are talking about.


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Old 09-12-2010, 07:06 AM   #3
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Typically seams between CBU and drywall are planned to lie beneth the last course of tiles (vertically and horizontally). They are hidden by tiles. Seam are joined with alkali resistant mesh tape (yellow) and thinset. A tip I learned after doing my bathrooms is to apply the tape as you are applying the tiles so as to avoid a hump at that spot.
Bullnose is actually a cheaper alternative to more decorative and more attractive tiles. Some of these look like ledges. You could use a regular tile and than a piece of plastic channel but the look would not be very good.
Since tiles are meant to last for many years, I'd say to resist the temptation to save a buck. Avoid use of mastic in the tub/ shower area and remember that the first course of tile must be perfectly level even if the tub is not.
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Old 09-12-2010, 08:40 AM   #4
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There are a variety of metal edges used to Finish off the tile instead of bullnose.

Look at the tile work at a McDonald's---Kind of a modern,industrial look---

These are available at any tile store.
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