Installing a bathroom in my basement the attached picture is what Im working with. The horizontal 2" against the wall is venting the kitchen sink(this pipe is the pipe that runs at the top of the pic). I want to put a toilet, shower stall, sink and washer what would be the proper way to achieve this with the proper wet venting.

This is how we install our bathroom groups using a wet vent.(see image).

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The horizontal 2" against the wall is venting the kitchen sink

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Not if it's below the sinks flood rim it isn't. That pipe's a drain if I ever saw one and if you were planing on using it to vent the basement bath you will have to go another route. If it's too difficult to run up a vent to the roof perhaps, if codes allow, you could install a AAV.(Air Admittance Vent.
Good luck with your new project. Tom

If you notice there are two pipes that run up into the floor the first one is capped it runs into the second one in the corner that runs up and out through a lower roof,this is how it would look if I took out the one that use to be a drain. I want to connect to the 3" below the clean out replacing the sweep so I can tap into to it

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there are two pipes that run up into the floor the first one is capped it runs into the second one in the corner that runs up and out through a lower roof

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Are you telling me that this pipe's completely dry and has never had a fixture draining into it? If that's the case your drawing looks just fine. Go for it. I was wondering, if the vent for the sink in the basement wouldn't that indicate a "S" trap on the sink? Just wondering. Regards, Tom

If you look at the first pic you will notice a 2" pipe running across the top of the picture this is a drain for the sink in the kitchen on the first floor (it connects above the clean out), the pipe running to the back of the wall is going up and out. Can I extend the pipe running up and out down further to vent the new bathroom in this area. Thanks

This is called a "revent" and yes you can use this pipe as a vent PROVIDING that it's dry with nothing draining into it from above, Good luck, Tom

Thanks

Anytime! More questions? I'm as close as a click. Tom

Hi Dennm69

As Tom said,you can use the 2" vent to vent the bathroom group (and washer), but you CANNOT install the side inlet elbow at the base of the stack that you propose... not allowed by any code that I know of. Here, code wants you to install a WYE fitting after the long sweep elbow at the base of the stack.

You can wet vent the toilet and the tub/shower using the 2" sink vent (must remain 2" all the way), but you must run an individual 1.5" vent for the washing machine drain. This 1.5" vent can connect into the 2" sink vent or the other vent (going out the roof), but must connect into the vents at a minimum of 48" off the floor, OK?

More questions just let us know, OK?

Mark

Ok this is the deal, going to extend that 3" to the back of the wall with a 2" vent stack at the end, then all in a row against the wall have toilet, sink, shower. Wet vent the toilet and the shower with the sink ( have the vents branch out from the sink) up and over to the vent stack in the coner. Anything I should keep in mind code wise. Fitting that are reqiured etc. Does this sound good thanks