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Old 11-21-2003, 10:01 PM   #1
Marko F
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Cement Board/Drywall Transition

I am tiling about 4 feet up my wall in a bathroom. I haven't put up an cement board yet. (Bathroom is gutted) I am wondering if I shoud put the cement board higher than the tile will be, maybe 4.5 feet. If I do this how will I finish the cement board to make it blend in with the drywall?

I heard that you shouldn't just try to skimcoat the cement board with joint compound. What is usually done in these situations?

Thank you for all the help!!
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Old 11-21-2003, 10:40 PM   #2
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Stop the CBU an inch and a half or so below the top of your tile layout, Marko, and sheetrock above that. Tape and float the joint with either thinset or sheetrock mud, then let the top of your last tile cover the joint.

Is all of this wall outside of any wet areas?
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Old 11-22-2003, 08:03 PM   #3
Marko F
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Thanks CX. I actually put up some of the CBU and drywall today. I did exactly as you mentioned. I ended up stopping the CBU abouy 3 inches below where the tile will come to. It is not a wet area.

Thanks for the help!!
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Old 11-23-2003, 05:32 AM   #4
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Another procedure for transition where the area will be painted and not tiled is:
- Mix 1 part organic mastic with 4 parts water (very loose mix)
- Trowel this about 1-2 inches onto the cement board
- Mix some Durabond and tape the joint (using paper tape) as normal
- Completely embed the paper tape with the Durabond.

The reason given for the mastic on the cbu is to seal the cbu to protect the paper tape.
Cement boards can pickup moisture and you do not want that to soak the tape and compromise the joint.

This was given to me by the US Gypsum the makers of Durock

Nino
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Old 11-23-2003, 06:07 AM   #5
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Scares me, Nino, and I'm usually neigh on to fearless.

I don't manufacture sheetrock nor CBU, but it seems to me that if I wanted to seal either against moisture, the last thing I would choose would be a water-soluble organic compound, one known to re-emulsify in the presence of moisture.

If you have a link to where you saw that information, I'd kinda like to send them an email question about their rationale.
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Old 11-24-2003, 05:16 AM   #6
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Durock Transition

this all started when I called the company to ask a question.
we got talking and they gave me this procedure over the phone.
I ended up calling them back twice more just to make sure I understood this procedure they were talking about.
I found it rather interesting myself. thought this was a good thread to get some reaction to this procedure.
the number for US Gypsum I used is: 800-874-4968
maybe you could call to question them.

thanks

Nino
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