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Plumbing code question anthonymmfalcone 11-01-2007
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Posted by on November 1, 2007, 9:11 am
Dear Readers,

I need advice on a plumbing code question. My existing 1st floor
bathroom vanity appears to use the drain from the 2nd floor toilet as
a vent stack. Appears that both 1st and 2nd floor toilets have no
other fixtures draining into their respective drains.

Question: does the plumbing code allow me to route the 1st floor
vanity drain into the same drain from the 2nd floor toilet (which is
being used as a vent for the same vanity)? Or must I continue to have
a dedicated drain for toilet?

See sketch at: http://farm3.static.flickr.com/2416/1814061886_24cf91d8d3_b_d.jpg
(If this is not the appropriate way to reference an image on this
newsgroup, please advise and I'll change).

Your comments are appreciated.
Regards,

Anthony


Posted by Steve Barker on November 1, 2007, 9:21 am
you're ok. It's called a 'wet stack'.


steve


> Dear Readers,
>
> I need advice on a plumbing code question. My existing 1st floor
> bathroom vanity appears to use the drain from the 2nd floor toilet as
> a vent stack. Appears that both 1st and 2nd floor toilets have no
> other fixtures draining into their respective drains.
>
> Question: does the plumbing code allow me to route the 1st floor
> vanity drain into the same drain from the 2nd floor toilet (which is
> being used as a vent for the same vanity)? Or must I continue to have
> a dedicated drain for toilet?
>
> See sketch at:
> http://farm3.static.flickr.com/2416/1814061886_24cf91d8d3_b_d.jpg
> (If this is not the appropriate way to reference an image on this
> newsgroup, please advise and I'll change).
>
> Your comments are appreciated.
> Regards,
>
> Anthony
>



Posted by willshak on November 1, 2007, 10:28 am
on 11/1/2007 9:21 AM Steve Barker said the following:
> you're ok. It's called a 'wet stack'.
>
>
> steve
>

Aren't wet stacks only allowed on the same floor?


>
>
>> Dear Readers,
>>
>> I need advice on a plumbing code question. My existing 1st floor
>> bathroom vanity appears to use the drain from the 2nd floor toilet as
>> a vent stack. Appears that both 1st and 2nd floor toilets have no
>> other fixtures draining into their respective drains.
>>
>> Question: does the plumbing code allow me to route the 1st floor
>> vanity drain into the same drain from the 2nd floor toilet (which is
>> being used as a vent for the same vanity)? Or must I continue to have
>> a dedicated drain for toilet?
>>
>> See sketch at:
>> http://farm3.static.flickr.com/2416/1814061886_24cf91d8d3_b_d.jpg
>> (If this is not the appropriate way to reference an image on this
>> newsgroup, please advise and I'll change).
>>
>> Your comments are appreciated.
>> Regards,
>>
>> Anthony
>>
>>
>
>
>


--

Bill
In Hamptonburgh, NY
To email, remove the double zeroes after @

Posted by DerbyDad03 on November 1, 2007, 11:09 am
> on 11/1/2007 9:21 AM Steve Barker said the following:
>
> > you're ok. It's called a 'wet stack'.
>
> > steve
>
> Aren't wet stacks only allowed on the same floor?
>
>
>
>
>
>
>
>
> >> Dear Readers,
>
> >> I need advice on a plumbing code question. My existing 1st floor
> >> bathroom vanity appears to use the drain from the 2nd floor toilet as
> >> a vent stack. Appears that both 1st and 2nd floor toilets have no
> >> other fixtures draining into their respective drains.
>
> >> Question: does the plumbing code allow me to route the 1st floor
> >> vanity drain into the same drain from the 2nd floor toilet (which is
> >> being used as a vent for the same vanity)? Or must I continue to have
> >> a dedicated drain for toilet?
>
> >> See sketch at:
> >>http://farm3.static.flickr.com/2416/1814061886_24cf91d8d3_b_d.jpg
> >> (If this is not the appropriate way to reference an image on this
> >> newsgroup, please advise and I'll change).
>
> >> Your comments are appreciated.
> >> Regards,
>
> >> Anthony
>
> --
>
> Bill
> In Hamptonburgh, NY
> To email, remove the double zeroes after @- Hide quoted text -
>
> - Show quoted text -

re: Aren't wet stacks only allowed on the same floor?

I hope not! My 2nd floor bathroom, 1st floor sink and 4 basement
fixtures (full bath and utility sink) all use the same wet stack.
There are no dedicated vents for any fixtures in my house.

The 1st and 2nd floor fixtures drain into the cast iron vertical stack
and the basement fixtures all connect to the cast iron drain pipe
under the slab. Everything works fine as far as I can tell. The only
drainage problems I've ever had in 24 years were caused by roots in
the town owned section of the drain out by the street.


Posted by Speedy Jim on November 1, 2007, 11:34 am
DerbyDad03 wrote:
<SNIP>

>
> re: Aren't wet stacks only allowed on the same floor?
>
> I hope not! My 2nd floor bathroom, 1st floor sink and 4 basement
> fixtures (full bath and utility sink) all use the same wet stack.
> There are no dedicated vents for any fixtures in my house.
>
> The 1st and 2nd floor fixtures drain into the cast iron vertical stack
> and the basement fixtures all connect to the cast iron drain pipe
> under the slab. Everything works fine as far as I can tell. The only
> drainage problems I've ever had in 24 years were caused by roots in
> the town owned section of the drain out by the street.
>

There is/was an exception in the case where the soil stack
is 4" size. In this case, the 1st floor and 2nd floor
toilets may join the stack without additional venting.
Lav trap could empty above the uppermost toilet.

Today, you probably couldn't do things like this,
but it was accepted practice and did work.

Jim

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