Can I have my washer p-trap tied directly into the main drain line? There is a vent located nearly 5 feet away upstream for the bathroom sink. Will that suffice?

Hi Chfaber...

Great that you asked the question as you CANNOT just connect directly into the main drain line without venting the washer. Here, the sink vent can be used to wet vent certain fixtures but it cannot be used to wet vent a washing machine.

A washing machine needs to have a dedicated vent and its own ptrap with an 18-36" standpipe coming out of the trap.

2" drain size is best with an 1.5" vent piped back to the sink vent and connected in at 42-48" off the finish floor of the bathroom. The vent must pitch so that any rain water that gets into the vent pipes from the main vent stack can flow back to the drain via gravity, OK?

You may also be able to install an AAV (mechanical vent) in place of a dedicated vent at the washing machine, but most plumbing codes will not approve of this.

Questions? Let me know, OK?

Mark

Ok thanks for your help. I have some pictures of the current plumbing situation with washer stand pipe and p-trap options. Will they work? Any suggestions? Also, there is currently a p-trap connected to the main drain line. Should it be replaced with a 90 degree sweep elbow or could I just leave it in place. I will obviously have a p-trap above the floor and have it vented as well.

C:\Users\CareNet\Desktop\Picture1.jpg

C:\Users\CareNet\Desktop\Picture2.jpg

I couldn't access the pictures. You posted your desktop info. Only... need to post it to the site.

Also, if you are saying there is a trap downstairs and you plan on adding the trap and vent upstairs then you definitely want to remove the trap in the basement as you cannot double trap a fixture.

Add a full size cleanout tee when you remove that old trap and use a long sweep 90 to go vertical for best job.

Try to post the pics. Again, if you like.

Mark

Sorry, I'm not sure how to get the pictures posted. Any help?

I think I got it. Give these a try.

http://img.photobucket.com/albums/v354/conrada/Picture2.jpg

http://img.photobucket.com/albums/v354/conrada/Picture1.jpg

I definitely see a few issues here. Please find out if wet venting is allowed in your area and then I can revise your drawing as needed, OK?

Back to you...

Mark

This house is located in rural Utah and I believe wet venting is permitted. Thanks for your help. It's greatly appreciated.

Take a look at the revised drawing below. Here, I made it so you are wet venting the toilet and the tub using the 2" lavatory drain and vent. The washing machine vent can connect into the sink vent at about 42"-48" off the floor and then you can continue the 2" vent over to the vent stack and connect a little higher.

Use all WYE fittings on the horizontal... no sanitary tee fittings here. Invert the vent fittings as drawn and pitch the vents so rain water can drain down the vents and into the drain pipe via gravity.

Install a full size cleanout at the washing machine if possible and hang all pipes every 4 feet, OK?

Any questions just let me know...

Mark

Thanks a lot! I will try to get this done. Just a question, would it have worked like this? See picture.

http://img.photobucket.com/albums/v354/conrada/PLUMBING.jpg

Only if you add a 2" vent to the toilet branch..then yeah, that would work, too. Here, you would be individually venting all fixtures...exactly as most codes want! Although, that vent stack is so far away from the tub, technically you should add another 1.5" vent just for the tub...

Wet venting will usually save time and money, but if it doesn't in this case go with it as drawn below (top drawing).

You could also connect the sink into the 2" toilet vent as drawn at the bottom as long as the sink is within 3-5 feet of the toilet vent.

Consider installing that 1.5" vent within 5 feet of the tub trap... that's what code wants if you are individually venting this bathroom... ;)

SO there you go... 3 ways to do it by code... your choice... :)

Mark