Kitchen sink P Trap

Wayco Wayne_2

After my kitchen sink drain pipe comes out of the garbage disposal, how much drop should I have before the trap? Much thanks. WW

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Jim Bennett

I try....

to keep the trap up as high as possible to maximize under sink storage.

Just make sure the outlet of your trap, the top of the "S" bend, is lower than the disposal so you don't retain water in it.

Happy New Year!

Wayco Wayne_2

Can you

have it too high? My drain isn't draining so fast. WW

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Ed_26

slow drain

Always slow since install? Or just now... after Xmas/new year?

bovide_4

three or four inches average

going down into your p-trap. The disposal comes with the slip elbow. I'm assuming it is a p-trap to the wall, not an s-trap into the floor?

bob young

sluggish drain

2 " kitchen sink waste is usually roughed out at about 15 " off finished floor with a tee wye & intersecting continuous vent. if line is not draining properly you might have a slight stoppage or possibly line is not vented. did it ever work properly ?

hot_rod

or is it

tied to the other side of the sink with a combo waste. Those tees have a baffle in them that may be partially plugged.

hot rod

Wayco Wayne_2

Thanks for replys

We got a new sink with our new cabinets last Spring. The new Sink was deeper than the old. I attached to old drain but there was barely any slope to the drain pipe that came out of the back wall of below the sink. Water wouldn't drain unless we turned on the disposal. I always meant to get around to fixing it. Last night I was told it was time, by she who must be obeyed. (yikes!) I cut some holes in the drywall and found the drain turned left and ran horizontal. Not good. I wanted some drop to the drain. I traced it down to basement ceiling where it came down through the outside wall. Cut it down there and ran new drain up under floor to side of under cabinet. Now it has slope but I re-used old P trap which only had about a 1/2 inch drop before the trap. Drain works better but still isn't very fast. I'm going to add 3 inches of drop into the trap and see if it speeds things up. This is fun. I get to play plumber instead of hvac. WW

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hot_rod

Is it vented properly?

lack of proper vent can also make for a slow drain. An auto vent under the cabinet is one way to solve that.

Lack of pitch in the trap arm with a sink full of water above generally doesn't cause a slow drain. Could the drain line be obstructed downstream?

hot rod

bovide_4

Is this drain vented?

Like HR said, if not get yourself an air admittance valve. Dont get a "pro vent" ($2-$3). Get a Studor or Oatey, about $20 and pipe it according to their specs.

Todd_17

AAV

Air admittance valves are not all that great. I use them sparingly and usually also install a loop vent. Yes alot of extra work, but it will not cause problems later

Weezbo

well, on the new drain did you install a 2\" cleanout?

an approved air gap , break out the plug in the garbage disposer.. tie the dish washer into the air gap?
the longer the drop to a trap on a drain ,the more noise it makes.
..*~/:)

Wayco Wayne_2

Bingo!!!

It's not vented. Where does the vent tie in? I got a disposal. Does it tie into the dishwasher drain that runs to the disposal? Thanks for helping me. WW

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mtfallsmikey

Vent

Horizontal pipe in the wall should terminate into a tee (which will be "bullheaded",or come into the center of the tee) then vent comes off the top of the tee vertically eiether thru the roof, or into a vent stack. All you have now is an extended-arm s-trap! Tees are code-required, max run from trap to vent on 2" is 8' (if memory is correct). Old CABO code allowed for a tee-wye / combination fitting: BOCA considered this an S-trap. You could put an AAV under the sink just downstream of the trap, pipe it as high in the cabinet as you can, sometimes it works, sometimes it don't.