Hi i am in the process of replaceing my plumbing in my house, my
question is if i install a bathroom in my basement do i have to vent
the sink sepreatly or can i stack vent it? The sink is less than 12
feet from the stack, do i also have to vent the upstairs sink or is it
ok to be stack vented like the existing system?
my other question is what size should a floor drain be? I am from
IANAP, but it is my understanding that this would be a bad idea -- the
vent for the sink should connect to the stack above the highest fixture
in the house. It would be easier and cheaper and (to my understanding)
better to just use one of those re-vent devices with the one-way air
vent. Hide it in a wall behind the sink, or somewhere similar, and
provide adequate air flow into the wall cavity.
Not sure about this so check with a plumber...
You may not need a vent at all for the sink in the basement. There are
times when you are within a certain distance of underground drains a
vent is not needed.
It depends, among other things, how big the existing soil
stack is, and what's hook up to it on the upper floors.
Simplest thing to do would be to run a separate pipe up
alongside the existing soil-stack, connected above the
flood level of the highest fixture, and tie all the
things that you are considering hooking to the
soil stack to that. THat makes sure that everything's
vented but you don't need an extra roof penetration.
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