Hello everyone,

I am building a new bathroom in the back of my garage and need some help. I need a plumbing schematic for the permit, but I am having trouble figuring out how to do it. I found this (https://www.askmehelpdesk.com/plumbing/help-doing-pvc-plumbing-whole-new-bathroom-433120-3.html) thread and learned a lot from it. Maybe Mark or someone could help me out too.

I already have it framed and have built up the floor with 2x6s above the concrete garage floor so I can run my plumbing under it for 12' until I go into the basement.

Here is my plan in which I added plumbing to give you guys a good picture of it.
http://img837.imageshack.us/img837/8655/plumbing.jpg

Considering how far away the existing vent stack it, I assume I would need another one.

Oh, and this is a 1 floor ranch in NY.

Thanks!

HI Jonny21...

Glad to draw something up on this, but it will take a day or two. Please find out if wet venting is allowed in your area and then let me know and I'll get to work.

Milo and Tom have gotten pretty good at drawing stuff up, too so if they pop in and take this I'm fine with that, too!

Chat soon...

Mark

Mark,

That would be awesome! Yes, wet venting is allowed here.

Thanks for the help!

Jon

Mark's more familiar with the East Coast codes so he's the expert to call on. Milo and I are around if needed. Good luck on your project, Tom

Hi Jonny...

I didn't forget about you... just having trouble with my computer drawing. I should have the kinks worked out by tonight and will post something no later than tomorrow morning.

Thanks...

No problem at all. I appreciate it so much.

Jon

HI Jonny...

I drew a WET VENTED BATHROOM on your diagram in yellow for the drain lines... see image below. You need to cut a WYE fitting into the main drain line and then immediately install a 3" test tee cleanout before sending the 3" drain line into the garage.

The next issue focuses on what the inspector will want to do with the vent/vent stack for this garage. He could require you to run a 3" vent stack up and through the roof or he could require you to run a 2" vent up and through the roof or he could let you run a 2" vent from the bathroom and connect into the existing vent system for the house...this is up to him. Ask him before proceeding further...;)

In the diagrams below I assumed a 3" stack through the roof. If the inspector doesn't require the 3" vent out the roof simply ignore the 3" vertical in the diagram below and send the 2" vent from the fixtures wherever he tells you to go with it. You will still want to keep a 3" test tee cleanout as an end of the run cleanout as indicated below, but you will just install a 3" pressure cap on top to close it off. Be sure it faces out so the cap it is readily accessible.

Use 45s in place of the 3" 90s to change direction.

Hang/support all drain/vent pipes every 4 feet.

Use long sweep 90s whenever you bring a pipe out of the ground.

Install cleanouts as indicated... again, making them accessible.

Wrap the drains with foam liner as they come through the concrete and wrap the toilet drain pipe with a 3/4" thickness of foam wrap all around the pipe as it goes through the concrete. This will be removed later when installing the toilet flange.

Vents cannot turn horizontal until at least 6 inches above the flood level rim of the highest fixture in the bathroom, i.e., the lavatory rim , or in other words, a minimum of 42" to 48" off the finish floor.

Vents must pitch back toward the drain so rain water and condensation in the vent can fall back to the drain by gravity.

The 3"x2" wye that comes off the toilet drain MUST roll above the centerline of the toilet drain to allow the lavatory drain to act as a wetted vent for the toilet. The 2" wye branch drain for the shower can come off at the centerline of the lavatory drain line.

The last image shows what I mean about rolling the fitting above the center line of the toilet drain. It also serves as another example of wet venting a bathroom. <<<IGNORE THE DRUMTRAP>>>

Let me know what you think... OK?

Mark

Wow Mark, that's awesome. Thanks so much! I really appreciate it.
Jon