I am a homeowner who occasionally installs toilets for myself and friends and have noticed many manufacturers no longer make much of an effort to ensure their toilet bowl bases are indeed flat. Most recently I replaced a 3.5 gallon toilet. The old toilet had a bottom which had obviously been ground flat by the manufacturer after the porcelain had been fired and no shims had been required. The new unit bowl would not sit flat without extensive shimming (the floor was flat). Inspection of the bowl bottom with a straight edge easily found the problem spot. I was able to correct the problem by grinding down the high spots.
Does Toto make any special effort to ensure a flat bowl base for their toilets?
Does Toto make any special effort to ensure a flat bowl base for their toilets?