Shower Ceiling

[MARK T V]

Hi, My Name Is Mark, I Am New To This Site. My Question Is We Are Building Shower, Walls Are Already Partially Up, Noticed Ceiling Is Angled Aproximately 1/2 Inch. Currently Have Green Board, Thinking On Shimming And Adding Cbu. Would Thinset And Screws Be Sufficient? Planning To Tile With 4" Tile. Thanks

[muskymike]

Hi Mark, welcome! You can stick the tile to the greenboard with thinset or if you wish to flatten it you can use regular drywall.

[MARK T V]

Thanks Muskymike, Appreciate Advice, Mark.

[jadnashua]

CBU on the ceiling over the greenboard would work. Tiling direct to the greenboard would work, too, but it needs to be supported at 12" rather than the 16" you probably have. A ceiling over a shower, unless a steam shower isn't considered a wet area, and plain drywall would be okay (it is a little stronger than greenboard, and 16" on center works). BTW, greenboard in the national codes no longer is spec'ed for use...it's either cbu if it's wet, or drywall if it isn't. Some local agencies haven't changed the local rules, which override the national ones.

[MARK T V]

Jadnashua, Thanks For Reply. Other Question Is Ceiling Being Approximately 1/2 Inch Off, Is This To Large To Make Up With Thinset. Using Regular Drywall Sounds Like Good Idea. One Probem Is Walls Are Already Floated So It Will Be Tough To Screw In To Studs On Edges. Would Support In Center + Gluing To Greenboard Work, Or Would It Be Best To Open Up Ceiling And Put More Supports Along Edge? Thanks, Mark

[Mike2]

Mark, FYI. By eliminating the initial caps from every word, your posts would be much easier to read.

A 1/2" out of level really is too much to correct with thin-set mortar. What exactly is causing this, do you know? If you stop the wall tiles at about the shower head or slightly above it, would this condition even be noticeable? My guess is, probably not.

[MARK T V]

Mike,
I believe the ceiling joists must have been off . When new greenboard was put up we did not notice. The point on stopping above shower would probably make it less noticeable, however we are planning on tiling the entire shower. Any other suggestions? Thanks. Mark

[jadnashua]

I'd probably cut out the existing stuff, shim the joists, put up drywall, and tile it. Or, forget about tiling the ceiling and do as Mark suggested. My ceiling was out of whack about the same. I was tiling with granite. I cut a 2" strip, and made a crown moulding effect to the ceiling. That probably wouldn't work for you, so making the ceiling plumb and level would be best.

[MARK T V]

Thanks Jim,
Leaning towards tear out idea. Mark.

[jadnashua]

Rather than shimming the overhead joists, you could nail some 2x4's up along the sides of them that are all nice and horizontal and aligned.

[MARK T V]

Thanks for all the good ideas, I should be able to fix it up this weekend and continue tiling. Mark