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Old 11-13-2011, 02:59 PM   #1
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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.

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Old 11-13-2011, 03:16 PM   #2
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bathtub vs. cement board for tile


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.

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Old 11-14-2011, 04:53 PM   #3
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bathtub vs. cement board for tile


but it's the bathroom floor -- i am using 1/2" backerboard
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Old 11-14-2011, 05:22 PM   #4
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bathtub vs. cement board for tile


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.
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Old 11-14-2011, 05:26 PM   #5
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bathtub vs. cement board for tile


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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.
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Old 11-14-2011, 05:57 PM   #6
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bathtub vs. cement board for tile


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---
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Old 11-14-2011, 06:46 PM   #7
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bathtub vs. cement board for tile


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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