Questions about Moving Toilet Location

[broadwille]

I am engaged in a major redesign/remodel of our second-floor master bath. The new layout calls for moving the existing toilet location about 12 feet horizontally from the present site. I plan to install a new Toto Guinevere 1.28GPF toilet.
I have a few questions:
1) What is the recommended/required drop per foot for a horizontal transit to the existing plumbing outlet site? (I have about 16" between floors.)
2) Does the existing venting need to be modified or moved to the new toilet location?
3) Other issues and/or recommendations?
Thanks in advance for any advice.

 

[GQuigley67]

if its tight you can do about 5mm a meter, if not 10mm a meter, as long as there is a run in it it will drain away, or you can make it a total of 40mm drop and use a string line to determine the height of brackets.

without looking at it i think the existing vent should be fine

 

[dontknowitall]

Seeing as you've mentioned 16" between floors, I'm wondering if you're thinking of cutting through the joists to hide the soil pipe under the floor? If you do this it's important to seek the advice of a structural engineer first as this might have a major impact on the stability of your house.

If you're not planning to do this and I'm barking up the wrong tree, please forgive my intrusion and I hope you enjoy the new bathroom when it's finished!!

 

[PlumbBobBob]

he could be lucky and have the joists running with the soil pipe.