Installing Shower Base over existing tile floor


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Old 05-26-13, 07:30 AM
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Installing Shower Base over existing tile floor

We are installing a Dreamline Corner Shower Base in an existing bathroom. We wanted to install over the existing tile floor for a much cleaner look. The installation instructions tell you to apply enough bedding material (mortar) to support the entire bottom of the base. Can we apply the bedding material over the existing tile or must we remove the tile?

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Old 05-26-13, 07:42 AM
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You should never short cut on the preparation of an install. The chances of the drain lining up perfectly are slim. You will then end up making series of little adjustments. Wedge this, notch this, force that and before you know it you have a leaking failed base. Break out the hammer and chisel, don eye shield and mask and take out some frustrations and remove the tile. You will be happy in the long run for it. Bathroom remodels are challenging enough, why complicate it even more.
 
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Old 06-02-13, 06:03 AM
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This is not a short cut decision. There is currently no tile in place and we are beginning this project from sub-floor up. We removed a coat closet from the opposite side of the existing powder room wall to convert to a three piece functional bathroom.

My question pertained to esthetics -- providing for a cleaner finished look of the basin. The floor is level and we are setting the drain ourselves. So the question was whether you can lay mortar over tile. I would appreciate a technical response to this question and not an opinion.

Thank you.
 
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Old 06-02-13, 07:38 AM
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We wanted to install over the existing tile floor for a much cleaner look.
There is currently no tile in place
You will have to pardon my confusion, only read what info you provided.

I have never seen nor ever built a shower set on top of existing tile. Confused about the "cleaner look" but that is your opinion.

If you look at the back of your tile you will see that it is unfinished and rough and provides an optimal bonding surface for your tile to mortar bond. On the exposed surface of the tile you most likely will have some sort of glazing or shine/sheen. Contrast the two and if you wish to place the shower base on top of the tile, I would consider scarifying the surface with a grinding wheel to provide a better bond.
 
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Old 06-02-13, 07:44 AM
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In a nut shell---yes you can--the mud bed is there to fill voids and prevent the pan from flexing.

Long answer---don't tile before the pan is installed.

Pan first--then the 1/4" backer set into a bed of fresh thinset--then cut the tile to the pan.

Why is this better? The rock and tile will hide any gaps under the pan--which looks better and keeps water from getting under the pan---

It's your project----so you must decide -----
 
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Old 06-02-13, 09:42 AM
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Thank you both for excellent information. Given that there is currently no tile in place we will have to weigh our options. This definitely helps get us closer to a decision.

Many thanks!
 
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Old 03-31-15, 12:57 PM
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Did it work installing shower base over the tile

We too are looking at installing a Dreamline shower base over tile for a clean look around the base (rounded shower base makes for tough tile fitting). Did you end up putting the base over the tile and if yes, did it work ok? Thanks!!
 
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Old 03-31-15, 01:26 PM
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Welcome to the forums - The original poster has not been back to visit since his last message 2 years ago. My suggestion to you is to tile the bathroom everywhere except against the shower base. Then return, hand place the tiles in position with spacers, temporary lay the base in place over the loose tile, and scribe a line that follows the front of the base. Remove the base, and then cut the tile. You will need a wet saw with a fresh diamond blade. Cut up to near the line in a series of parallel cuts 1/8" apart. Then snap the little pieces of tile off. Then you can use the diamond wheel like a grinder and drag the tile across it to produce your arc. If you choose a grout color that is very close to the tile color, it will all blend in.
 
 

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