Hammer a shim gently between the floor and the toilet base to bring a low side up.
How to level toilet on uneven concrete floor.
Start with small adjustments and if the toilet still feels uneven move on to more extensive adjustments later 1 x research source if you are trying to make the toilet completely level use a carpenter s level to measure how step 2 purchase stainless steel washers or plastic shims from a hardware store.
The shims should be inset 1 4 inch from the outside edge of the toilet.
Place a level on the back of the toilet.
Pour water into a bucket around of the way up then add the powder aiming for twice as much as the water volume.
Select a batch of adhesive again there are multiple variants suited for ceramics porcelain concrete underfloor heating etc.
Set the toilet down on the shims and take another level reading.
Sit on the toilet and rock it back and forth or side to side.
If it s not yet level lift the toilet again and push the shims in another quarter inch.
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Continue adjusting until the toilet is level.
Insert the hard rubber shims beneath the toilet on the side or sides that are uneven working your way around the bowl according to the reading on the level until the toilet is level.
If you ve shimmed too high and the toilet is off level in the other direction pull the shims out a quarter inch.
Step 1 check the toilet for wobbliness.
If the uneven floor is due to floor joists that have warped or twisted over time or were incorrectly installed the only way to level the floor is to remove the subflooring and shim the joists.
Place the carpenters level across the toilet bowl side to side and note where the bubble level is.