"Re: IRC requires toilet be caulked to floor?"
Always has.
Even the old pre-ICC codes have.
I've never understood how you can 'seal the fixture watertight to the floor' and yet 'leave out some sealant at the back' - just boggles my mind I tell you.
From the last post there:
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Very nice Dana- bottom line is the code specifies where a fixture comes in contact with the wall or floor,the joint between the fixture and the floor shall be made watertight."
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followed by
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I don't see much room for misinterpretation but apparently there is some.
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Okay, at this point I thought that poster had it down, down pat, but, after reading on, he stated:
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I do agree that not sealing a slight spot at back side of base is a desired application as it will alert owner and others to a leak at bowl to flange connection as well as allowing any moisture which might develop under toilet to dry up.
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Let me get this straight - he says ... 'okay, I understand, it needs to be sealed watertight, and, I think that pretty much clears it up so there should not be any mis-understanding, and, by the way, leave an un-watertight opening at the back' ...
Huh!