Sink Draining To Slow

nywoodwizard

All new plumbing has been installed.apparently there was a problem venting the kitchen sink (windows and obstructions),so the plumber puts an island vent in downstairs with a p-trap in the basement. My freind calls me over and asked if i could help install the new sink ,the problem is the waste line coming out of the wall was too high,so it needed the p-trap to drop the height to connect the tail piece to the sink.The sink is draining way too slow, i'm assuming too many traps now?. I guess the only fix is to break open the wall under the sink base and cut the waste line down lower and install a 45 and just remove the trap under the sink?

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The plumber

I'm not really getting the image in my head, but a drain should never be double trapped. The trap needs to be under the sink and I do not know why there would be a trap in the basement. If you could post a picture it would help. Did this not get inspected?

A W Smith

Our plumber Bruce showed us this method of island venting recently.
Does your vent look like this?
island vent

Herk

I'm not sure what you're talking about. An island sink doesn't have a trap under the floor.

Island Sink (illustrated)

(edited to add: Whoops, A.W. beat me to it . . .)

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nywoodwizard

Ah ha. It certainly don't look like that! What the heII was this plumber thinking. There is a p-trap under the floor and its vented ,the pipe comes up behind the sink base and in. I'll try and get a picture tomorrow. Looks like its all wrong from those pictures.

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A W Smith

the only time I have seen traps under the floor is for tubs and showers. You sure that was a plumber and not a handyman?

The plumber

If it is trapped under the sink and then 90s down that is an s-trap and it's illegal due to the trap sucking vacuum that it creates. There should be a sanitaty tee in the wall that the trap arm/sink drain goes directly in to. Above this san-t there needs to be some form of a vent like an island vent or studor vent. I prefer the island vent.

I would ask to see that license

KillerToiletSpider

A fixture that is double trapped will become airbound, and drain painfully slow.

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aWorkaHolic

Wouldn't installing a stuedder(sp*) valve help relieve that??

The plumber

Why not just rip it out and do it right? It would be hard to install a studor vent between the traps to relieve the pressure, plus it is frowned upon to put a studor vent that far beneath the flood level rim of a fixture if you put it in the basement

aWorkaHolic

I didn't read your first response, that is what I envisioned.

neolitic

This "S" trap, covers those suckers that trap and then sweep back down through the floor? I've had a few women that had their "designers" sell these thing to them.

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(Sorry....it seems there really are dumb questions)

Putty Truck

I'm beginning to see those Studor vents in some very wrong applications. I saw a garage full bathroom with nothing but Studor vents. They were terminating in the wall....the walls weren't rocked yet. The gc said that there would be openings in the wall...yeah right.

I did the small and quick repair and got the heck out of there. I wouldn't give the customer a receipt and demanded cash because I didn't want a paper trail to that abortion.

In a another Studor vent example, it was venting a full bathroom in a cabin. The Studor was located in the basement, a good 5' below the fixtures.

Someone ought to complain about Studor vents....

tzzzz216

I'm right there with you putty , I see that all over studor vents in the attic and the whole system either revented into 1 studor vent or each vent have a studor on it.

PARA1

CAN I SE YOUR PLUMBING LICENSE PLEASE?

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nywoodwizard

Here's what it looks like ,the pipe leading off the trap goes to the sink upstairs,the other goes to the vent stack,i can see its going to be a mess to fix,kitchen is complete with granite tops.The cabinet back would have to be cut open to make the proper repairs,from the look of the photos i've seen.

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nywoodwizard

forgot the picture ,here it is

Attached Images

  

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A W Smith

why would you need to open the cabinet back? Just drill two holes in the floor inside the cabinet and then through the sub floor and install a new drain and vent loop. abandon and cap off the inaccessible pipe behind the cabinet.

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nywoodwizard

pardon me,i just took to many dummy pills today
i guess i was just thinking cosmetics. the cabinet its stepped out 4" off the wall,i was just considering removing the back, installing the new piping where it can't be seen and just put a new back in. But if my knucklehead friend don't mind i'll do it thru the floor of the cabinet. thanks

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The plumber

The damage is done so the easiest fix without demo would be to get rid of that trap below the floor. Throw a sanitary tee with a riser coming up after the trap under the cabinets and put a studor vent as high as you can get it under the sink. Or you can cut out the back of the cabinets and run an island vent. I would do the island vent, but I figured Id give you another option.
I do not see any primer on those pipes either.