I recently discovered that my washing machine drain does not have a trap. I have a picture here of the connection in my crawl space with the sewer pipe showing the old cast iron vent going to the roof and the 2 inch pipe going to the washing machine that transitions to a 1-1/2 pipe through the floor. The second picture is my plan to add a P trap replacing the 1-1/2 pipe with a 2 inch and putting the trap outside the wall as I can not find a way to put it in the wall.

I'm not sure if I am creating an S trap this way or if I need to put in a tee and add an AAV going up the wall and cutting out a space to make it accessible. I need to know if the vent connection you can see in the crawl space picture is acceptable and would pass inspection and if my planed P trap would also pass inspection. The picture with the trap also shows a 90 degree elbow that would get it a bit closer to the wall but I am not sure if that elbow is acceptable. I am also wondering what the height of the standpipe needs to be and if it could be a few inches lower. It is about the height of the washer now. The P trap horizontal piece is more than 4 inches long and although it is sitting on the floor now, it would be several inches higher at the top of that cut out making the horizontal section more than 6 inches from the floor. I have tested these pieces dry fitted down to the sewer line below.

I have tried for over a week now to get a local plumber to come and look at this for me but so far have been unsuccessful. I am now covering the existing no trap connection with a rubber cap and only take it off when we use the washing machine. I am grateful for any advice.

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Edited 1 times.

GAG CHOKE PUKE


EVERYTHING needs to be torn out and redone



At this point, PENDING A PLUMBER AND A PERMIT, you could simply add a trap in the crawl space .......................

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"Measure Twice & Cut Once" - Retired U.A. Local 1 & 638

AFTER turning the backwards tee around?

Yes the piping in the crawl space has multiple issues hire a pro, the way that was piped looks like a homeowner did it

........ a drunken, blind, moronic home-owner ........

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"Measure Twice & Cut Once" - Retired U.A. Local 1 & 638

Or an unhandy, handyman.