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Posted by Speedy Jim on November 1, 2007, 12:52 pm
DerbyDad03 wrote:
>> 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
>
> I believe the cast soil stack is 4" so I guess my house is
> exceptional. :-)
>
> However, this statement confuses me: "Lav trap could empty above the
> uppermost toilet"
>
> The uppermost toilet is on the second floor, and obviously the toilet
> drain is on the floor. How could anything empty *above* this?
>
> Both the sink and tub empty into the pipe that the toilet sits on,
> just a few inches below the shoe.
>
Ah. That's a side-inlet to the "closet bend".
It wouldn't normally be done without some vent
provision, but could have been allowed by local
exception. It worked and that was the ultimate test.
Over the years, every state/county had their own
interpretation of what constituted good practice.
Unlike the Electrical Code, we never had just one
plumbing code.
Jim
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