I am remodeling my kitchen which is on the first floor. Right above the
kitchen is full bath. All second floor bath fixtures batt outside wall.
As 2 X 8 joist run perpendicular to that outside wall and the wall is
framed with 2 X 4 all second floor fixtures drains are not hidden
inside plumbing wall but instead ugly hang a foot or so from the wall
inside space above the kitchen cabinets. I do not think the venting is
correct. Curently drains from bath tub, toilet and lavatory come almost
to the same point in 3" drain vent stack (they are not exactly in the
same point, may be a foor apart) and 3" vent continues through the
rough. Is it correct venting? I thought all individual vents for each
fixture should go up and then connect to main vent stack 6" above
flooding level of higherst fixture, it means in the artic. First, I
need to do something to hide all drains as right now they break entire
kitchen, I do not want to close space above new kitchen cabinets.
What's the best approach to do this? What maximum size of holes can I
drill in 2 X 8 joist close to the end? I obviously cannot dril holes
for 3" toilet drain but can I drill holes for 1 1/2" or 2" in PVC
In some places, that type of stack venting
arrangement IS permitted.
Important point is that the toilet must be the
*lowest* fixture discharging into the stack.
I am not the wood framing expert, but there
is probably no problem drilling for 1 1/2"
pipe near the end of the joist (close to center
or near the top).
I am not sure I understand what ou mean "lowest fixture discharging
into drain". I have bath tub, lavatory and toilet. I do not have any
vent issues, like sucking water our of toiltet. Regarding drilling
holes, 1 1/2" is inside diameter, outside diameter for PVC pipe is
I was concerned that maybe you were going to
re-arrange the way the fixtures connected into
the stack. In that case, make sure the toilet
does not enter the stack *above* the tub and sink.
If you are not changing it, disregard.
Yes, I know that 1 1/2" pipe is ~ ID.
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