Trap to vent distance and how to do what i'd like to do!

[fcat]

I've removed one vanity and am adding either two seperate ones or a twin vanity with one trap.



and I'd like to move two vanities over to as below:


Distance at the moment from vent to proposed furthest trap is about 90"

Questions:

1. I believe the max distance from vent to trap is 3' 6" , is that correct ? ( The vent and waste as 1 1/2")
2. If i were to move the vent over to the right to bring the traps nearer does the whole vent have to move, (ie from under ground in the concrete) or can just the section that I'm connecting to be moved ?
3. is there a maximum height for the stub out for the waste for vanity ? i know suggested is 16-20"

cheers for any info


p.s. The outlet is going to be disconnected and removed

 

[Jadnashua]

You can put a vent line behind the new vanity within the necessary limitations, run it vertically at least 42" above the floor, then over to attach it to the existing vent line.

 

[Sponsor]

 

[fcat]

You can put a vent line behind the new vanity within the necessary limitations, run it vertically at least 42" above the floor, then over to attach it to the existing vent line.

Thanks for the reply, does it have to be run 42" or just so its above the overflow of the sinks ?

 

[Cacher_Chick]

quote; At least 6" above the FLOOD RIM of the sink, which puts a standard installation at 42".

The codes states, "at least 6" above the flood rim OR 42" WHICHEVER IS HIGHEST. A conventional lavatory is usually 31" so 6" above the flood level would only be 37".

 

[fcat]

At least 6" above the FLOOD RIM of the sink, which puts a standard installation at 42".

Ok, great , thanks, so am i ok with the length of my waste being 94" to the furthest vanity ?

 

[Jadnashua]

As long as it is vented properly, the rest is just drainage, and that could go on forever as long as it has the appropriate slope.

 

[fcat]

As long as it is vented properly, the rest is just drainage, and that could go on forever as long as it has the appropriate slope.

Thanks again

 

[fcat]

Could i use one of these on each sink instead of having to run the vent lines ?

https://ipscorp.com/plumbing/brands/studor/

 

[Terry]

Could i use one of these on each sink instead of having to run the vent lines ?
https://ipscorp.com/plumbing/brands/studor/

If you are perfect from the wall and don't need to swivel the trap, maybe. What are the odds you will be perfect?

 

[fcat]

If you are perfect from the wall and don't need to swivel the trap, maybe. What are the odds you will be perfect?

Thanks Terry, slight change of plan, have got a combined double vanity with one waste so i should be able to go into the vent pipe which will be within 3ft 6" to the left appreciate the help

 

[Terry]

There are a lot of ways, I've never done two lavs on a single trap arm though.

 

[fcat]

I am right in that i'll just need one vent now even though there's two sinks, because there's only one trap that's one vent yeah ?