The new toilet I'm installing has a side to side rock(pre wax ring test) of between 1/16" and 1/8". Is the wax ring sufficient to overcome this gap? A level indicates the left side of the toilet as I face it is where the shim would need to be placed in order to stop the rocking and have the toilet remain level.


Install the wax ring pressing firmly all the way around the toilet. Use your level again. You can add wedges on one side by sliding them in gently. I would use more than one for stability. Don't slide them in too far or you will break the wax seal. Once you get them where you need them, tighten up the floor bolts. To finish, cut the excess from the wedges and caulk around the base.

  • Caution....caulking around the toilet looks clean, however, if the wax ring leaks....you'll never know until you step to use the toiet, squish squish and through the floor you go. Not to mention if you ever need to replace the whole toilet, the mess of cleaning the caulk and possiby the flooring materal. – Jeff Cates Feb 10 at 21:10

There's a few ways to play this. You'll need to make sure you don't overtighten the toilet.

Use plastic shims

Plastic shims are readily available. It will level your toilet and keep it from working the bolts loose

Install waterproof flooring

My son's toilet needed a lot of shims (the flange was cast iron and tall). Not long after, we decided to install some vinyl plank flooring in his bathroom. We just put the vinyl plank down on top of the tile. I was amazed how well the toilet fit afterward.

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