height of sink trap

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Old 07-08-03, 02:37 PM
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height of sink trap

How low can the sink trap be? I think the code is 24 inches, but I want to verify that. If I can go lower, I want to place my trap under the floor, making the drain much easier to run because of a brick wall. Once under the floor, I only need to run the drain 3 feet to the stack. Sound reasonable?
 
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Old 07-09-03, 05:33 AM
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You can not trap under the floor.

Min distance off the floor must be 6" to bottom of the trap.

Tailpiece to trap must not exceed 24".

Where is the vent for this sink line?
 
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Old 07-09-03, 06:31 AM
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thanks Plumber 2000

The vent is 3 feet to the left of the sink in a corner, but the walls are brick. The current approach is to run the drain through the old cabinets, but I want to avoid that because I'm installing new cabinets.
 
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Old 07-09-03, 06:46 AM
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Code says here on a 1-1/2" drain line to the vent no more then 2' 6" what you want to do is not code but it will work that way, is this under the floor a basement?

If you don't have a basement then it is not advisable to put that trap under the floor.
 
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Old 07-09-03, 07:37 AM
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There is an unfinished basement underneath, so access is no issue.

If I use a larger diameter pipe, install a trap just below the sink, I assume my only option is to go through the cabinets to be compliant with code.

Is the no way to run down into the basement after the trap and then cut left to the stack?
 
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Old 07-09-03, 02:46 PM
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Well like I said, it's your call, if you run 2" trap and the waste arm is 2" then code here says max distance to the vent will not exceed 5'

Of course to trap itself needs to be 2" by code.

The trap under the floor will not be to code, but it can work that way.

If the tailpiece exceeds 24" to the trap, this will also violate the code.

Keep in mind that I get this info from the code we use here in Oregon and may be totally different there.
 
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Old 07-10-03, 06:35 AM
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Here's a new way that should be up to code, I think.

The trap is standard under the sink, then the drain heads to the wall, bends 90 down through the floor. Once in the basement, the drain bends 90 to the left and to the stack(3 feet away). I can use two inch pipe all the way to be compliant with code. Seem rational?
 
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Old 07-10-03, 06:41 AM
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That creates a s-trap, this is not close to code and very much illegal, here is the closest I can get you to being at code, trap under sink, to a santee, above santee pipe with female adapter and a studer vent or auto-vent screwed into it, below the santee is the pipe heading to the stack

Then again use of studer vents and auto-vents are not code approved.
 
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Old 07-10-03, 08:35 AM
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That makes sense. Are you saying I can drop down from the T and Studor vent to underneath the floor and then head vertically to the stack.

In other words, the Studor vent eliminates the problems associated with a S- trap configuration.

Thanks Plumber 2000.
 
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