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Old 02-13-2007, 06:48 AM   #1
jvarnes
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Mastic or Thinset Mortar?

Everything I've read here says not to use mastic in wet environments (tub surround), but use thinset. I mentioned this to a friend and he insists that thinset is not sticky and it's for floor applications only? He says use mastic. Am I missing something? Can someone please confirm exactly what I should use? I'm finally to the point that I'm ready to hang the durock and need to know which side to face outwards.


Thanks - Jeff

Admins - I attempted to post this on the end of my original thread since you moved my last post there...it went unseen so I posted it as a new thread.
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Old 02-13-2007, 06:52 AM   #2
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use thinset, durock rough side out and tape the joints at the same time you tile.
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Old 02-13-2007, 06:57 AM   #3
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Use thinset.

The durock goes with the sticker side facing the studs or the rough side out.

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Old 02-13-2007, 07:00 AM   #4
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Jeff,

I just used thinset to stick tiles to my ceiling. How much more sticky does it need to be?

Mastic is water soluble. There are plenty of mastic disasters documented on this site.

Additionally, mastic causes warts, global warming, and it won't protect your shower from meteors
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Old 02-13-2007, 07:17 AM   #5
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Jeff,
Don't even think about Mastic when you have VersaBond or other modified thinsets available to ya.... and another good thing - it's cheaper..... Tape with alkaline resistant tape and make the tape joints as smooth and thin as possible if taping before tiling..
Use a "Mix yer ownself" thinset...
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Old 02-13-2007, 07:54 AM   #6
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Jeff, I'd say its highly possible that your friend mixes his thinset way too watery. Its not very sticky at all if you use too much water. Follow the directions on the bag and you'll end up with a mix that's pretty close to the consistency and 'grabbiness' of mastic.
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Old 02-13-2007, 08:08 AM   #7
stullis
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Is the tub surround for a tub/shower combo? If yes use thinset. They do make anti-sag thinsets.
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Old 02-13-2007, 08:11 AM   #8
jvarnes
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Thanks you all very much for the replies. I'll definitely go w/ the thinset (not premixed). Two related questions:

1) Should I use the latex modified thinset?

2) As for taping the CBU joints...do I do the corners also?

Thanks again all - Jeff
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Old 02-13-2007, 08:16 AM   #9
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Unless your tile manufacturer says otherwise, I think you can't go wrong with the Versabond from Home Depot or other Customs dealers. It's lightly modified.

And yeah, tape the corners. Make sure you use the alkali resistant mesh tape.
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