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Old 06-21-2013, 04:22 PM   #1
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Why does my newly installed toilet rock back and forth?


We installed my toilet about a month ago. My fiance, who weighs almost 400 pounds, sat on the toilet to seal it so that should have sealed it. We bolted it down, and it sits flat on the floor. But when you sit on the bowl, it rocks forward. When you stand up, it rocks back. This was my first time ever attempting to install a toilet. What could be causing it to rock?
I would like to solve this without breaking the wax ring's seal but somehow i get the feeling i wont be able to. Why does it rock?

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Old 06-21-2013, 04:39 PM   #2
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Why does my newly installed toilet rock back and forth?


If it's sitting flat on the floor it shouldn't rock- unless:

It isn't actually- maybe a side/end that needs a noncorrosive shim

Sub floor flexing

toilet outlet riding on the flange- meaning the flange is too high or toilet off center

Flange not anchored to the floor prior to setting toilet

toilet bolts too loose

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Old 06-21-2013, 04:53 PM   #3
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Why does my newly installed toilet rock back and forth?


the only one of those it might be is loose toilet bolts. The sub floor is solid, plywood. The flange was installed by the factory, and sits level with the floor. The same toilet was installed on the same flange a few months before reinstalling it. Here is a couple of pics, it seems to be sitting flat.
yes i know its dirty, we have no running water to clean it yet
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Why does my newly installed toilet rock back and forth?-bathroom-floor-2.jpg   Why does my newly installed toilet rock back and forth?-toilet-hookup.jpg  
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Old 06-21-2013, 04:54 PM   #4
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Why does my newly installed toilet rock back and forth?


An old trailer or mobile home ? Each of the several that I've worked on needed some type of subfloor reinforcement or replacement, and/or better flange attachment.
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Old 06-21-2013, 05:00 PM   #5
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Why does my newly installed toilet rock back and forth?


its about thirty years old, and a mobile home, but the subfloor is solid. It was recently replaced, along with most of the drainline plumbing.
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Old 06-21-2013, 05:00 PM   #6
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Why does my newly installed toilet rock back and forth?


the only part of the drain that is still factory is the flange
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Old 06-21-2013, 05:01 PM   #7
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Why does my newly installed toilet rock back and forth?


Maybe a contributing factor- you need stainless steel washers on top of the plastic washer (toilet bolts)

And I also agree with the subfloor-manufactured homes do not have good fllor systems
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Old 06-21-2013, 05:07 PM   #8
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Why does my newly installed toilet rock back and forth?


That plastic washer is just sitting there, its meant for the cover but the bolts are too long for the cover to fit. the stainless steel washer is there.

This home has a recently replaced plywood subfloor, only one problem with it and that is from a severe water leak left untreated for a year
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Old 06-21-2013, 05:20 PM   #9
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Why does my newly installed toilet rock back and forth?


your problem is the laminate floor, its a floating base. the way i have seen floors replaced on mobile homes 7/8 ply followed by wonder board, then tiled. then toilet gets a grout base.
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Old 06-21-2013, 05:26 PM   #10
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Why does my newly installed toilet rock back and forth?


Quote:
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your problem is the laminate floor, its a floating base.
I think you're on to something. I thought that seam was in vinyl flooring
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Old 06-21-2013, 05:29 PM   #11
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Why does my newly installed toilet rock back and forth?


Quote:
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I think you're on to something. I thought that seam was in vinyl flooring
You may be right looking closer it might be vinyl.
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Old 06-21-2013, 08:49 PM   #12
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Why does my newly installed toilet rock back and forth?


Toilets are designed to be able to take hundreds of thousands of vertical pounds. The toilet is operating as it should. The anchor bolts and the floor may not be able to withstand the weight being applied

It sounds like you need to have the floor reenforced.

You can rebuild a section of the floor, reenforce the flange or remove it and install a metal one.

Install grab bars to facilitate moving onto and off the toilet.

Also removal of the current toilet and the installation of an ADA Compliant toiletry be needed. The said toilet will come furnished with back supports that drill into the stud to provide better structural support to the toilet.
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Old 06-23-2013, 10:07 PM   #13
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Why does my newly installed toilet rock back and forth?


I dealt with this with one of my tenets that was over 400 pounds as well. I lag bolted a brass flange to the floor Joice and he ended up breaking the toilet. This was like a 2 month headache and I thought I was done with it after replacing everything. The final solution was as mentioned with the ada compliance. I framed everything out of wood. I made a wooden cage around the tank because I realized he was falling into the toilet as he sat down. Grip bars and basically shielded the toilet from his slammed weight. Did you dry fit the toilet to make sure the flage is not making the toilet rock. Those flanges that fit inside the pipe can make a toilet rock
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Old 06-24-2013, 03:09 PM   #14
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Why does my newly installed toilet rock back and forth?


The floor is fine. It does not need reinforcement, it is new and perfectly sturdy. And we do not need grab bars, for God's sake i am 24 years old, i am perfectly capable of sitting properly on a toilet, as is my future spouse. The floor is vinyl, not laminate. This toilet was installed when i bought the house. We uninstalled it to demo the room, then put it back with a new wax ring.
I asked my dad to take a look at it this weekend. He grabbed ahold the bowl and shook it side to side, and it did not rock or move at all. He said that if the flange was loose, it would have moved when he shook it. I showed him how it moved when you sit on the bowl, and he said that is due to the bolts not being tight enough, and that we needed to tighten them with a wrench, not by hand. Which makes sense. So sometime this week i will go out and use a wrench to tighten the bolts down. The problem has nothing to do with the floor, the floor is perfectly level and not rotten, and its properly supported. The problem is loose bolts, i guess. I will know for sure if it still moves after i tighten down the bolts.
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Old 06-24-2013, 03:34 PM   #15
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Why does my newly installed toilet rock back and forth?


I understand what your saying.


I would recommend a ADA toilet furnished with grab bars and vertical support. If excess weight is applied to the flange you may have a problem down the road.

There are several institutional style toilets that may suit your bathroom.

The bathroom floor may be compromised and using the same flange may be a bad idea.

If the user of the toilet is of a heavier weight there should be some support to the toilet to prevent it from cracking

A structural cage should be fabricated to the studs of the residence.

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