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jpm6621 · 10-11-2012, 12:08 AM

Does a washing machine drain need a vent when its tapped into the main stack? Or does the vent of the stack act as a vent for the washing machine drain too?

**phishfood** · 10-11-2012, 12:22 AM

If there are other fixtures on the stack above it, then in most cases "Yes" it does need a vent.

With more detailed information as to what fixtures drain into the stack and where, I could possibly be of more help.

**stevemachine** · 10-11-2012, 12:46 AM

Yeah if there's a toilet draining in the same stack above your laundry then yes you need to vent the laundry. Toilet has to be the lowest connected fixture on a wet vent (at least that's what I was taught in school)

**IFIXH20** · 10-11-2012, 02:29 AM

how did you seal the pvc pipe in the cast iron hub , with silcone ?

**stevemachine** · 10-11-2012, 02:59 AM

Didn't even see that, good call cause that does look like silicone

jpm6621 · 10-11-2012, 03:53 AM

PVC Pipe into Hub is sealed with oakum. I use to have Hercules Plastic Seal around that, but i have changed some things and have not got any more yet. The pipe you seein the picture is the main stack on the left, and the pipe with the drop is for the washer only, it rises up out of the picture where the washer hose hooks in. All of this is in the basement, the picture and the washing machine, so it's all below the toilet b/c thats on the first floor, draining into the main stack above what you see. Does this mean that the drain in my picture needs to vent up and into the main stack above where the toilet drain enters the stack? What about an Air Admittance Valve for the washer drain, just after the trap before it enters the stack? or is that completely wrong?

**stevemachine** · 10-11-2012, 04:59 AM

You could do an AAV, ideally a proper vent tied in above flood level rim of the upstairs sink is best but AAV may be the most practical option for you. And yes after the trap but before the tie into the stack is perfect

**johnjh2o** · 10-11-2012, 09:35 AM

What is the other fitting below the washer line? There should also be a full size clean out before the line enters the slab.

John

journeyman · 10-11-2012, 02:33 PM

Personally i would have cut off the cast iron hub and used a no-hub band to go from cast iron to abs pipe. I personally dont trust silicone like that. And john is right you should have a clean out some where especially since it is in your basement.

jpm6621 · 10-11-2012, 03:40 PM

Heres another picture. You can see the washer drain and the drain below that goes over to a sink, and that sink has a AAV on it just after the trap. The low spot or "pit" has a lead plug for a cleanout, in which i need to install a sump pump since any outside water that enters the basement ends up here. The sink im talking about use to just drain into that "pit" and there was no plug, letting sewer gas into the house. I installed a plug then tapped into the main stack for the sink. That washing machine machine does't get vented from the main stack? Even being so close?