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Old 12-30-2009, 10:05 PM   #1
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"Taping" Concrete backer


I am doing my basement and in the shower I hung 1/2" durock. My drywall taper (contractor) taped and filled the corners with regular paper and drywall mud. This seems like a disaster waiting to happen.

Am I wrong? I thought the recommended taping was fiberglass cloth and a coat of thinset????

Secondly, every piece of information I've found about installation says overlap the lip of the shower pan leaving 1/8th inch gap between bottom of rock and top edge of pan. This is set up level with the top of the lip, no overlap.

How do I fix these two issues? Can I just peel the paper tape off and brush as much of the drywall mud off as possible and come back with the correct material?

What about the bottom?

Freaking out a little.


Last edited by diykc; 12-31-2009 at 08:10 AM.
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Old 12-30-2009, 10:52 PM   #2
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"Taping" Concrete backer


you are right he is wrong. Use only alkyd resistant mesh tape and thinset or durabond 90 (mix from a bag) compound.

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Old 12-31-2009, 12:13 PM   #3
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"Taping" Concrete backer


You are correct:

"Prefill joints, as well as inside and
outside corners, with latex-fortified
mortar or Type 1 organic
adhesive and then immediately
embed tape and level joints.
NOTE: Use latex-fortified portland cement
mortar for wall shield and floor protector
applications. From: http://www.usg.com/USG_Marketing_Con...tion_Guide.pdf

Be safe, Gary
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Old 12-31-2009, 12:28 PM   #4
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"Taping" Concrete backer


I would recommend you hold back money as well before paying the guy. To often I see people pay the contractor up front and then they are left holding the bag on a shoddy job. If you end up fixing his mistake, don't be afraid to hand HIM a bill for your time.

Oh, and what the other guys here said about the install is right and the contractor is wrong, and yes you do want a gap between the rock and the tub. Need room for the expansion/contraction
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Old 12-31-2009, 12:34 PM   #5
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"Taping" Concrete backer


The required gap is so water does not wick up behind the tile. Water can move by capillary action or diffusion. Water molecules will actually move to another water molecule. Yes water will move against gravity.
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Old 12-31-2009, 12:44 PM   #6
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"Taping" Concrete backer


Oh, thanks for that Bob. All this time I thought it was for handling the movement of the tub due to weight changes as water/people enter and exit the tub/shower
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Old 12-31-2009, 02:31 PM   #7
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"Taping" Concrete backer


flexible silicone caulking is applied to this gap and not grout. This is what is designed to handle the movement you are now talking about
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Old 12-31-2009, 08:24 PM   #8
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"Taping" Concrete backer


Quote:
Originally Posted by jbraun View Post
I would recommend you hold back money as well before paying the guy. To often I see people pay the contractor up front and then they are left holding the bag on a shoddy job. If you end up fixing his mistake, don't be afraid to hand HIM a bill for your time.
This is what keeps Mike Holmes on TV. Love his show. I always wonder what the shoddy contractors think when they see the episode on tv that they caused.
Mike Hawkins

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