The first thing that needs to be done when installing a toilet on concrete is to make sure that the place you intend to install the toilet has the necessary pipes.
How to level concrete floor for toilet.
Reconnect the water supply line and open the shut off valve again to turn it back on.
If not you may need to make additional minor or major adjustments.
There must be a 3 inch diameter drainage pipe rising up from the concrete as well as a water supply pipe coming from an adjacent wall.
Set it back into position over the floor drain making sure the holes in the toilet base slide over the flange bolts.
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Use tapcon anchors or a similar type of masonry concrete screws to fasten the toilet flange to the concrete slab.
Screw the toilet flange onto the concrete.
With the toilet flange in place you are ready to install the toilet with a new wax ring.
If using a plastic flange ring be careful not to crack the ring by screwing the anchors in too far.
Place the carpenters level across the toilet bowl side to side and note where the bubble level is.
The problem with this is that the floor in our house is tinted concrete so we have very few options to remedy this.
If it is level enough to your liking the toilet is now fixed.
3 place a level on the back of the toilet.