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Unread 01-29-2003, 09:03 AM   #1
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Join Date: Jan 2003
Location: washington, dc.
Posts: 1
cbu over drywall/greenboard

Rob Z:

I have one customer who insists on us affixing a 5/16" pc of cbu on top of his ready to go greenboard in standard tub surrounds. This is done in an effort to achieve a "mudded" look; we finish the sides and top (run to standard height) with A-4200s. (The baths are always 4x4/6x6). For a variety of reasons I remain uncomfortable doing this. However, our approach so far has been this (no problems by the way in over 50 tub surrounds done over the last 2+ years): We "laminate" the CBU w/ 118.4 thinset, using proper screws. We then silicone (very heavy) the tops and bottom before setting the tile. (You may be able to infer that moisture is my biggest fear--that and gravity!) Rob, should i be doing anything differently? We then set the tile in 118.4 also. Maybe some sort of moisture barrier? 118.1 thinset to affix the board? Your thoughts would be appreciated. As a final note, the quality of framing is usually excellent. Thanks, Jim.
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Unread 01-29-2003, 06:47 PM   #2
Bud Cline
Tile Contractor -- Central Nebraska
Join Date: May 2001
Location: Central Nebraska
Posts: 7,567
That procedure has been used for decades...what's wrong with that? It's done in Texas all the time.
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Unread 01-29-2003, 07:00 PM   #3
Tile Setter
Join Date: May 2001
Location: Austin, TX
Posts: 4,840
No problems with using the CBU. Heck, it's better than greenboard !!

I add a layer of roofing felt between the greenboard and CBU as a vapor barrier

Good..Fast..Cheap. Pick any 2...can't have all three
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Unread 01-29-2003, 07:13 PM   #4
John Bridge
Join Date: Mar 2001
Location: Rosanky, Texas
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Hi Jim,

You might have to email Rob. He's in over his ears right now.

Nail the CBU over the greenboard with a moisture/vapor barrier in between the two. Forget laminating it. Use the 1/2 in. product and the A-4200 will work out perfect.
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