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-   -   bathtub vs. cement board for tile (http://www.diychatroom.com/f5/bathtub-vs-cement-board-tile-123327/)

amakarevic 11-13-2011 02:59 PM

bathtub vs. cement board for tile
 
i was wondering if there is any reason to install cement board under the bathtub. it is a plain and simple recessed bath tub on three sides. i thought maybe only if i put an inch of cement board under the apron of the tub it would be enough so it sits on it instead of putting the tub directly on top of subfloor and then cement board outside would raise tiles too high against the tub.

oh'mike 11-13-2011 03:16 PM

Actually the cement board is best butted against the apron--It's only 1/4" --that and the ceramic tile will not bury to much of the apron--

This will hide be bottom edge of the apron---good if the floor is out of level and the apron is shimmed.

amakarevic 11-14-2011 04:53 PM

but it's the bathroom floor -- i am using 1/2" backerboard

DannyT 11-14-2011 05:22 PM

the only time you need to use 1/2 inch is on walls or if you need to raise the height of your floor to match existing. 1/4 inch will work fine on the floor like Mike said.

amakarevic 11-14-2011 05:26 PM

Quote:

Originally Posted by DannyT (Post 771172)
the only time you need to use 1/2 inch is on walls or if you need to raise the height of your floor to match existing. 1/4 inch will work fine on the floor like Mike said.

i thought 1/2" is for the floor by default and 1/4" for the wall by default. why does the wall backerboard need to be thick?

i thought 1/2" for the floor to make it firmer so that the tile doesn't break.

oh'mike 11-14-2011 05:57 PM

The backer boards only purpose is to offer an ideal surface to bond the tile to---

It adds no real strength to the floor system---that's the job of the floor joists and the subfloor.

The backer is set into a bed of wet thinset and nailed or screwed--the thinset is there to fill in any voids.

!/2" is used on walls--it matches the thickness of the drywall----Mike---

Bud Cline 11-14-2011 06:46 PM

You do what you want......

But, 1/2" is a must for walls, anything less is not thick enough.

Quarter inch is generally for floors but 1/2" can also be used.

Doesn't matter how thick the cement board is it still offers NO structural value what-so-ever. You are over-thinking this and have your information backwards.:)


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