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Old 03-08-2012, 07:35 PM   #1
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Mortar shower pan over concrete


What do I use between the concrete slab and the first layer of mortar for my pan? Can I use 4 mil plastic?I don't want to bond it because of the small cracks in the slab already.

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Old 03-08-2012, 10:09 PM   #2
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Mortar shower pan over concrete


I think it is best to wet the concrete and apply some thinset with a notched trowel, then put in the mortar.

I don't think it's going to matter too much how your mortar sticks to the concrete. Gravity will hold it in place. But it is always a good idea to moisten things when dealing with masonry as well as other endeavors.

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Old 03-08-2012, 10:53 PM   #3
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Mortar shower pan over concrete


What if I wanted it not to bond to the concrete? The slab has a few cracks and a section I had to fill with concrete and it left cold joints. And I read that the cracks could transfer in to the tile if the mortar bed was bonded?
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Old 03-08-2012, 10:54 PM   #4
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Mortar shower pan over concrete


Thanks for you input and time!
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Old 03-09-2012, 08:11 AM   #5
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Mortar shower pan over concrete


If you don't want to bond, then almost anything. Plastic, roofing paper.
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