How high does the toilet overflow pipe need to be in a standard residential toilet?
Normally 11/2" vent and a 3" soil line. BUT some codes want a 4" waste and then a 2" vent may be required depends on the local inspector.
If you're referring to a "stack", the pipe that protrudes from the roof of the structure, then yes. All indoor plumbing; sink drains, bath and shower drains, toilets, etc. require a stack. The stack...
drain the water?
Everything needs the toilets if you hold your urine in for too long [you will need an operation.]
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