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Author:
Palm329 (VA)
Looking for review/advice on my planned plumbing job... I made a diagram of my whole house including the new plumbing:
(Red lines are dry vents, blue lines hold water)
Pretty much left side of diagram all exists already, the new plumbing is over to the right side of diagram. (Kitchen and laundry room, as well as basement bathroom at center)
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Author:
NP16 (OR)
1. need 2" vent off new basement lav for wet vent (toilet)
2. no clean-outs shown at all.
3. backwater valve required?
4. good start to a drawing. But if you were to redo this drawing using a 30-60-90 triangle and put horizontal pipe at 30 degrees and vertical pipe vertically that would improve your drawing 10 fold.
5. will you add a trap primer for your emergency floor drain?
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Author:
Palm329 (VA)
Basement lav I was planning 1.5” trap arm to 2x1.5x1.5 sani tee... so 2” down to intercept toilet branch. Is that sufficient?
No backwater valve needed.
Cleanouts at base of each vertical stack above basement floor. Not sure of optimal height for these?
No knowledge about trap primers. None in existing traps.
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Author:
srloren (CA)
Your vent for the tub needs to be more than 15". It should be tied in at 6" above the overflow rim of the tub (in the event you have a stoppage)
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Author:
packy (MA)
the wet vent and "its extension to the vent stack" needs to be 2 inch. it can not be reduced at the top of the san tee.
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Author:
Palm329 (VA)
Ok understood. I can do that for the basement drains but the upstairs bathroom is already wet vented with 1.5... designed in the 50’s... can fix that in the future if I work on that bathroom...
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Author:
packy (MA)
you're OK upstairs. the top floor fixtures are treated differently from lower floor fixtures.
the upstairs toilets are stack vented since there really isn't anything draining into that stack above them.
so draining the sink into an upstairs toilet drain is not going to syphon out the toilet but flushing that toilet can syphon out the sink trap. BUT !!! the sinks are vented so that can not happen.
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