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Old 03-27-2011, 12:46 PM   #1
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Bullnose. MAstic or Thinset.


I have just had a tile floor installed in my hallways, entry, living room and dining room. I had all the baseboards removed from the drywall before installation. Now I'm going to install bullnose all around. I'm not sure if I should use mastic or thinset and this is the reason why.

When the base boards were removed much of the paper backing to the drywall went with it and I'm concerned that the moisture in the thinset will seep into the exposed drywall material.

What are the disadvantages of using mastic over thinset if any.

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Old 03-27-2011, 04:29 PM   #2
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Bullnose. MAstic or Thinset.


Use a modified thin set. It'll say modified or polymer modified or something like that. It's very common available every where. Be sure to leave the expansion space between the tiles and wall open.

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Old 03-27-2011, 04:33 PM   #3
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Bullnose. MAstic or Thinset.


What do you mean by "expansion space"? Placing a grout spacer under the bullnose?
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Old 03-27-2011, 04:57 PM   #4
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Bullnose. MAstic or Thinset.


Are you talking about using bull nose as a base molding?

If so, Jazzes suggested setting material (modified thin set) is good.

If the area is a dry area---tile mastic should also be acceptable.---Mike---
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Old 03-27-2011, 05:07 PM   #5
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Bullnose. MAstic or Thinset.


The tile floor is already down. The bullnose will sit on top of the floor as a base molding. Are there any disadvantages to using tile mastic?
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Old 03-27-2011, 05:48 PM   #6
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Bullnose. MAstic or Thinset.


No disadvantage---go for it!!
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Old 03-27-2011, 07:14 PM   #7
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Bullnose. MAstic or Thinset.


I believe the expansion space Jasman refers to is the space between your bullnose and the floor tile. Do not grout this space. Use a caulk. Preferrably the same color as your grout. If you grout this joint, it will very likely crack as there is almost always some movement between walls and the floor. Caulking has enough give to allow some movement without cracking!
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Old 03-27-2011, 07:50 PM   #8
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Bullnose. MAstic or Thinset.


Thanks for the caulking clarification and all the helpful comments!


Last edited by Xchair; 03-27-2011 at 08:14 PM.
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