Foot Vent question for island loop vent

[j-flux]

First post here so a huge thank you ahead of time to all the folks offering great advice on this forum. I'm hoping someone can clear up my confusion about foot vents in an island loop vent configuration: My question is: since a foot vent is technically below the flood rim level of the sink fixture, is a horizontal change in the direction of the foot vent prohibited by code (UPC in this case)? Or is this vent now technically considered to be above the flood rim because it's an island foot vent and can change direction like any other vent above the flood rim?

 

[j-flux]

Ok, couple months now, and was hoping someone might no the answer to this, so bump...

 

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[Jeff H Young]

yes you can . Onty possible issue would be an inspectors opinion was that your offset wasent nessesary eg like poor lay out on your on your part , So he could say and Im not infering he will that had you thought your layout through an offset in the foot vent wouldnt be nessesary. Inspectors vary some take a hard stance sometimes the stance is correct in that someone plumbed it in a dumb way is now having a problem meeting code that dosent mean they just get a pass but throwing a 45 in that foot vent might be ok depends on the reason I think

 

[Tuttles Revenge]

Yes it violates the portion of the code that says a vent must not offset horizontally below the flood level of the fixture. But this is the acceptable method for doing it. That is why those portions under the flood level must be installed as drainage fittings, sloped and with a cleanout.

 

[Jeff H Young]

Yes it violates the portion of the code that says a vent must not offset horizontally below the flood level of the fixture. But this is the acceptable method for doing it. That is why those portions under the flood level must be installed as drainage fittings, sloped and with a cleanout.

Its sort of semantics if the inspector agrees that a island vent can be used then the offsetting of vent below floodlevel is not a violation at all but if you do a bunch of silly offsetting of that vent or even a single fitting without need I could and would agree to it as a violation but basicaly the foot vent comes down that wall with a long sweep slopes toward a combi (not a santee) and should have no fittings in between or my opinion its a fail unless you have some good reason ( structural ) but you cant go a few feet and then just decide to throw a fitting on without good reason in my opinion . there are diagraghms on legal Island vents and slight mods can be an issue.
Ive had some real bullshit calls and even had to tear out an island sink set up , was instructed by foreman to run a vent less than 6 inches above flood level had to tear that out and finally had to moove the waste line and run a 5 ft 2 inch trap arm for a kitchen sink. None of this work was under my control or choice High dollar homes Palo Verde Ca on the bluff.

 

[j-flux]

Thanks everyone for your replies. The question here was on a renovation project and the reason for the potential offset was because of existing structural conditions. Appreciate the help!