Kitchen sink running out roof overflow - Page 2 - Plumbing Forum

**PrecisionPlumbing** · 10-11-2011, 03:06 PM

Im an owner of a plumbing company and i have seen this. It was the weirdest site to see water coming from the roof vent. It was caused by a clogged sink p trap, and drain, and when the washer drained the force of pressure shot it out the roof vent.

**Mr_David** · 10-15-2011, 11:49 AM

That's Crazy.
So for that to occur the washer is connected to the drain some how after the clogged p-trap.

LeakFinder · 10-17-2011, 07:07 PM

Sounds like you need a longer snake! They also make camera's which go down the vent pipe to see if there is a problem under your house that is causing these clogs. Normal pipes should not clog unless there is an issue under the house, or if things are put down the pipes that shouldn't be put down them. Older houses with cast iron pipes are notorious for cast iron scale building up inside the lines causing issues.

**Fansplumbing** · 10-18-2011, 01:05 AM

Quote:

Originally Posted by Mr_David

That's Crazy.
So for that to occur the washer is connected to the drain some how after the clogged p-trap.

Seems odd. Wouldn't the water back up into the dishwasher before shooting all the way up the vent and out the of roof? I'd have to see that!

Bulldog77 · 01-18-2012, 06:13 AM

I have seen water come out of the roof vent from a backed up kitchen sink but was only when there was a blockage and I used the garbage disposal. Fixed the problem by snaking thru the kitchen sink trap arm with my mytana 3/8' cable.

LeakFinder · 01-20-2012, 08:35 PM

Do you have a garbage disposal installed that you can use to help grind up some of the things you put down the sink?

**Another-Plumber** · 01-20-2012, 11:17 PM

i once pulled up to a customers house and seen the laundry vent overflowing with water, the roof and lint stains real bad, found out the guy used a fernco to clamp his hose to the pipe forcing the water into the pipe, up and out, LOL... he said its been coming out his roof vent for a year now, needless to say the drain was so packed from the start, i was not able to get my 1/4inch gorlitz cable thru it, i even tried the jetter, no luck, only thing left was to dig it up, how do you think he took that? well thats what happens when you neglect your plumbing, you will always end up paying..