Basement Plumbing help please

yyaassoo · Mar 9, 2010

Hello , I'm putting in new plumbing in my basement under cement slab .I have Attached drawing. Does this look right or will the wet vent from upstairs or the washing machine siphon out the floor drain ? Can you see any changes that need to be made ? Thanks for your help

Jadnashua · Mar 9, 2010

As you go down towards the main drain, anything that is acting as a drain is no longer a candidate to be a vent for those things below. You should run a new vent line so it can join up to the vent above the highest drain by at least 6".

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FloridaOrange · Mar 9, 2010

If all those fixtures are at the same level I think you are fine (some sketches can be misleading). Is the floor drain on the same level as the washing machine (I'd assume yes since it is the basement)? Your washing machine trap (tee) looks high, make sure you'll have some fall to the trap from the washing machine box.

hj · Mar 10, 2010

Florida, you must have missed the notation that the vertical line is the drain for the upstairs lavatory, which means that it CANNOT be the vent for the washer or floor drain, NOR a connection point for the sink's vent. And the washer discharge going past the floor drain's unvented connection COULD siphon it.

yyaassoo · Mar 10, 2010

Yes the clothes washer is on the same level , it has been working good the only thing im , realy changing is im puting in a floor drain , will it siphon out the floor drain ?

yyaassoo · Mar 10, 2010

Forgot to add that the line from the upstairs sink is also a vent that goes out the top of the roof .. Thanks for any help

FloridaOrange · Mar 10, 2010

hj said:
Florida, you must have missed the notation that the vertical line is the drain for the upstairs lavatory, which means that it CANNOT be the vent for the washer or floor drain, NOR a connection point for the sink's vent. And the washer discharge going past the floor drain's unvented connection COULD siphon it.

I guess I glossed over that. I read it as it was the vent (and vent only) for the upstairs lav.
OP, these guys are correct, if that line is a drain then in that situation it cannot be a vent.

hj · Mar 10, 2010

Whether the rest of the piping is there now or not, if you have drawn it correctly, it is an "illegal" system, possibly added by a DIYer or handyman, since it would NEVER have passed an inspection, as drawn.

NHmaster · Mar 11, 2010

Well, not all newer homes. In this part of the country we hardly never put floor drains in residential homes.

hj · Mar 12, 2010

Floor drains are basically a "basement thing" in residences and since basements are almost as scarce as chicken's teeth here, they are seldom a factor in sewer gas odors.

Basement Plumbing help please

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