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Old 02-25-2013, 04:07 PM   #1
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Onyx shower base


I am going to install an onyx shower base in a remodel setting. I have replaced the subfloor which is over the top of some 1x material, it's an old house. I still have some voids where the plywood edges don't exactly line up, plus I'm pretty sure the whole thing isn't level any way. Conventional wisdom is to pour mortar, quickcrete, thinset, etc then wiggle the base down into the concrete, level and then let set up. The instructions from the base manufacturer say not to use the concrete in this way. Any Ideas, or should I just go ahead and do it that way any way?

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Old 02-26-2013, 07:51 AM   #2
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Onyx shower base


I've set a lot of those over the years----I always used masons mix--brick mortar---with good results----

What does the manufacturer recommend?

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Old 02-26-2013, 10:55 AM   #3
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Onyx shower base


The manufacturer says not to push it down into wet concrete so that it stays free to allow to expand and contract, they say to use silicone for uneven edges and cracks. If I go this way I'll have to try and pour thinset or self leveling in there to try to achieve an overall levelness. I mentioned in the earlier post that the whole thing is a bit unlevel. I wasn't really wanting to go to that trouble. If I do how thick would I want to pour it? I'm really tempted to use the pour and wiggle theory, but I'm a little nervous about that as they say not too.
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Old 02-27-2013, 05:17 AM   #4
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Onyx shower base


Lay down some tar paper first---then the unit ca move a bit if it expands---Your call--I never had an issue---
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