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Old 03-27-2013, 11:56 AM   #1
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Dishwasher drain pipe fitting


I need some room above the trap to install the dishwasher drain piece, is there any issue with moving the trap down? Right now the bottom of the trap is 16.5" above the floor. I didn't know if there were any codes requiring traps to be a certain height off the floor. Thanks for your input.

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Old 03-27-2013, 05:03 PM   #2
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As far as I know, the trap in that picture is not to code regardless.

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Old 03-27-2013, 05:31 PM   #3
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Ok...what's not to code?
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Old 03-27-2013, 06:07 PM   #4
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It's am S-trap.
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Old 03-27-2013, 06:30 PM   #5
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A trap that goes straight down to the drain is an" S" , no longer permittted by code. It is subject to being siphoned dry as it is not vented properly.

Code now calls for a "P" trap that goes horizontally into the junction of the drain and the vent.

As far as I know, your S trap would be grandfathered and you can add a longer tail piece and lower the trap.
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Old 03-27-2013, 06:36 PM   #6
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Yes, it's an S trap and if I came to your house and did some work on the sink drain I'd have to bring it up to code...around here anyway. However, you own it and I assume you arent having it inspected. Lowering the trap isnt going to be an issue.

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Old 03-27-2013, 06:58 PM   #7
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So methane gas in your house is OK as long as you are "Grandfathered"? That is one really intelligent approach.

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Old 03-27-2013, 07:14 PM   #8
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So methane gas in your house is OK as long as you are "Grandfathered"? That is one really intelligent approach.

S traps have been around for many years and most in fact do not siphon dry. Although methane is a odorless gas, the other components in sewer gas make a very noticeable odor. If the OP has not had a problem in the past, adding a longer tailpiece will not cause a problem to appear.
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Old 03-27-2013, 07:15 PM   #9
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Not grand fatherd by this inspector. That S trap is a health and safety issue and can be easily fixed with a p trap and a tee and AAV vent.
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Old 03-27-2013, 11:31 PM   #10
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Thanks for the info everyone, I always appreciate your code knowledge. Plumbing aisle here I come...
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Old 03-28-2013, 08:30 PM   #11
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Not grand fatherd by this inspector. That S trap is a health and safety issue and can be easily fixed with a p trap and a tee and AAV vent.
Ghostmaker is 100% on the money, someone could be suffering from methane gas poisoning and not even know it.
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Old 03-28-2013, 08:50 PM   #12
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Absolutely. An AAV could be installed very easily and eliminate the threat. Why take a chance for 10 bucks worth of fittings?
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Old 03-28-2013, 10:57 PM   #13
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Totally agree w/ you guys. I'm going to get a hold of the building/plumbing inspector and find out if AAV's are allowed here.
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Old 03-28-2013, 11:11 PM   #14
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Totally agree w/ you guys. I'm going to get a hold of the building/plumbing inspector and find out if AAV's are allowed here.
You really don't have any other easy way to vent it. Google "AAV Vent" (images)
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Old 03-28-2013, 11:52 PM   #15
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Well if I absolutely needed to I could plumb in a p trap with a horizontal section long enough to break the siphon. It might not look great but I think it would satisfy code. Do you need an actual vent w/ a double sink?

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