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Old 05-12-2013, 07:58 PM   #1
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Double shower drain vent question.


Hello again.

This is the orientation of the P trap for the double shower (roughly). Will this set up be ok? Assuming I pitch the horizontal portion of the vent (downwards toward the drain), can I use a 90 degree el to tie into the vertical portion of the vent pipe. . .or are 2 45s preferable (required?)? Or ladies choice?

Thanks in advance.

Tom
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Old 05-13-2013, 06:58 AM   #2
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Double shower drain vent question.


Is this how you are proposing to vent the shower?

Do you know what a flat vent is?
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Old 05-13-2013, 09:18 AM   #3
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Double shower drain vent question.


Hi Hammerlane. Thanks for the reply.

Quote:
Originally Posted by hammerlane View Post
Is this how you are proposing to vent the shower?

Do you know what a flat vent is?
I know what a flat vent is now! This was just a very crude mock up to get the question out there.

So, if I were to rotate that wye so it comes off of the top, keep the run to the wall on an incline and then tie into the vertical portion, would that still not be acceptable since it's horizontal below the sink fixture. (That vertical portion ties into the sink vent in the attic and then exits through the roof vent, btw, if that makes a difference).

I'm a little confused on this one. Need to do a little more research. Any advice is appreciated.

Tom

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Old 05-13-2013, 10:18 AM   #4
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Double shower drain vent question.


That's not legal here. I don't know what code you are under. Also don't use that style of p-trap unless it's accessible.
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Old 05-13-2013, 10:35 AM   #5
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Double shower drain vent question.


Where are the shower walls located?
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Old 05-13-2013, 12:32 PM   #6
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Double shower drain vent question.


Alan, the bathroom is above the garage, so the P trap can be accesible if I choose. It's currently open from below.

E, I'll have to upload a photo when I get home later. It will definitely be easier to visualize where the walls of the shower will be. Basically, 30"Wx60"L with two ~16"Lx42"H "walls" on either side with glass and entry door in between.
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Old 05-13-2013, 05:12 PM   #7
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Double shower drain vent question.


Ok, here we go. . .

Crude pic, but hopefully you get the idea. 2x4 walls will be built to house a 32x60" walk in shower.

Tan = back wall
Black = side walls
Blue = front walls
Red = old shower stall and drain
Green = sink wall

The drain will fall roughly where it is placed. Below is the garage. The sinks will be on the wall to the right - you can see the drain rough in for the left sink at the bottom right of the pic.

Originally, the shower stall was in the left corner (the next joist bay to the left for the drain) and there was a sink facing the camera roughly where the lights are hanging from the ceiling. The stack and terlit are in the bottom left of the pic. The shower used a wet vent via the sink. I'm not sure I am expressing this correctly. . .I'll dig up a pic.

So what options do I have? How do I vent that shower drain without a flat vent?

Tom
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Old 05-13-2013, 05:21 PM   #8
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Without looking real hard for alternate methods- I'd put the line back in it's original joist bay- vent 1.5" up the new blue wall on the left side by using a 2x2x1.5" combo on it's back. then run the 2" trap arm into the shower and use a long sweep 90 to turn through the joist to the trap into the next bay- your proposed location. Now your vent is 100% vertical
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Old 05-13-2013, 05:54 PM   #9
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2 problems. . .

1. The vent pipe would have to make that 45 degree turn inside the blue wall, then another 45 to become horizontal, and then travel roughly halfway through that upper blue wall because there is absolutely no room to work up there in the attic. Where that current vent pipe sits was cramped enough!

2. To enter the attic, it would have to go through two plates. . .

My head is beginning to throb. . .
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Old 05-13-2013, 06:25 PM   #10
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Double shower drain vent question.


Do you have more room on the right side?
Drilling plates is plumbing rough-in 101
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Old 05-13-2013, 07:25 PM   #11
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Ha! I guess that came out the wrong way. I've done way more than my share of "construction" (and destruction!) over the years. Drilling through a plate is certainly not a problem. I'm not sure it would be a slam dunk. . .this house has not been very cooperative! If something can be in the way or require 5 additional pain in the @ss steps to accomplish, it's happened at EVERY turn. Yes, there is plenty of room from that vent pipe over (to the right) as this is heading towards the middle of the attic. It would be ideal to use that existing vent pipe, but I'll go take a peek an see what's a' doin' up there again. . .
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Old 05-13-2013, 08:29 PM   #12
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Double shower drain vent question.


Ok, after I came down from snooping around, the insulation dust went to my brain and I had a thought. . .

What if I were to move the drain back to the original joist bay like you suggested (which I'm still not completely sure how to do ), and when I come up the left side blue wall and get above 42":

1. take it through the studs on the side wall (black), then
2. with a 90 el or 2 45s, go across the back wall (tan), and then
3. 90 el up into the existing vent pipe (that connects with the sink vent in the attic and exits through the roof vent).

Like the white in this pic. Ignore the top white line - I don't think that's an option.

Thoughts??
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Old 05-14-2013, 06:56 AM   #13
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Double shower drain vent question.


Quote:
Originally Posted by TALDE View Post
1. take it through the studs on the side wall (black), then
2. with a 90 el or 2 45s, go across the back wall (tan), and then
3. 90 el up into the existing vent pipe (that connects with the sink vent in the attic and exits through the roof vent).
That could work.

Last edited by hammerlane; 05-14-2013 at 10:12 AM.
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Old 05-14-2013, 09:56 AM   #14
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Double shower drain vent question.


It looks like the wall on the left is an exterior wall. It would be a lot easier to just go straight up and pay a roofer 50 bucks to put a jack on for you, i think.
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Old 05-15-2013, 11:45 PM   #15
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Quote:
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It looks like the wall on the left is an exterior wall. It would be a lot easier to just go straight up and pay a roofer 50 bucks to put a jack on for you, i think.
Thanks for the suggestion, Alan, but I wouldn't do that since:
1. there's no room in the attic to get into that area
2. the vent would be too close to the gutter, and
3. I wouldn't want a third vent in that area of the roof.

So. . .put on your imagination caps on with me.

Here's a quick mock up with some stuff I had laying around (these are 1.5 inch for demo purpose only). It looks like I can squeeze by in the inside portion of the 16"W (blue) wall. Like you said E, come from the trap arm, through the joist with a long 90, add a wye on it's back and take the vent up vertically in the wall, and then continue on to the stack. Looking at the pics, what would be best to connect the last horizontal run. . .2 45s? 2 60s? 2 22s? (Less acute the better?)

Also, 2 questions about the sink drains. The original was 1.25 inch going into the stack. Is this 1.5"x1.25" into the stack a no no? If so, if I can cut just behind the bolt I (may??) be able to get a 2" part of the 1.5"x2" fernco screwed on there.

Do they make long turn 45s?? Is this 45 asking for trouble (draining from the sinks)?

That's all for now. It's been a long two days at "real" work. Thanks!

Tom
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