waste pipe design

Users who are viewing this thread

pancho

New Member
Messages
4
Reaction score
0
Points
0
Location
MN
I recently purchased an old church that I am converting to a home. It has minimal plumbing and I am trying to design the new waste system. Its in a very small town that doesn't require any permits for plumbing,electrical, or really anything unless you change the footprint of the building. I am doing most of the work myself and want to stick to code as much as possible. After looking over the venting methods in the irc code book and numerous google searches I came up with a crude drawing of what I would like to do. I am looking for any suggestions or obvious problems with this design.
plumbing_layout.gif
 

pancho

New Member
Messages
4
Reaction score
0
Points
0
Location
MN
Thanks for the reply.

I thought they should be vented but ended up copying examples close to my layout. Do you vent the shower with 2" also?
Do you think venting is needed on the water closets and floor drain as well? would it hurt to do it even if it wasn't required?
 

hj

Master Plumber
Messages
33,599
Reaction score
1,037
Points
113
Location
Cave Creek, Arizona
Website
www.terrylove.com
The shower, floor drain, and right hand toilet on the first floor are not vented, and the left hand one does not have the right sized vent. If that is a "two sink counter top" you should NOT use a single trap for them. The washer's trap should not be under the floor. The toilet on the second floor is probably not vented if it is actually connected the way you show it. The third floor MAY be done properly, but it depends on HOW you do the piping. The shower drains have to be 2".
 

pancho

New Member
Messages
4
Reaction score
0
Points
0
Location
MN
O.k. Thanks for the info.
I changed shower drains to 2" and added vents (1.5" ?), the left basement lav WAS a double sink I'm just not sure how to draw it but it will have a trap per sink. Added vent to floor drain (1.5"?). Washer trap is above ground. I thought toilets don't need venting, should they be? (2" vent?).

Currently there is One toilet and one sink in the basement, the rest is what I want to add in the building. the existing toilet and sink will probably be moved so I'm basically starting from scratch and will be having to tie into the existing cast iron stack. The closest plumber is 2hrs and doesn't return calls but I'm up for the challenge.

here is the new drawingplumbing_layout2.gif
 
Last edited:

Terry

The Plumbing Wizard
Staff member
Messages
29,946
Reaction score
3,460
Points
113
Location
Bothell, Washington
Website
terrylove.com
The upstairs plumbing will need to enter below any venting takes place. That means you will need to break up the floor and install a wye fitting for the upper floors.

dwv_b2.jpg
 

hj

Master Plumber
Messages
33,599
Reaction score
1,037
Points
113
Location
Cave Creek, Arizona
Website
www.terrylove.com
quote; I thought toilets don't need venting, should they be? (2" vent?).

The don't "need" venting to flush properly, but they do need venting to eliminate "positive pressures" from the water flowing down the pipe from the upstairs bathroom. This is the reason that the basement and first floor toilets NEED venting, which you do not have according to your drawing. In all cases, however, what you actually install will determine how the system works, NOT how you draw it. I have seen many "good" drawings, but the actual installation was completely incorrect.
 

Terry

The Plumbing Wizard
Staff member
Messages
29,946
Reaction score
3,460
Points
113
Location
Bothell, Washington
Website
terrylove.com
With positive pressure, the toilets on the lower end of the stack will have water movement in the bowl, every time a toilet above them is flushed.
Sometimes that means that water is slopped around and the water level in the bowl is lowered.

Venting properly is a "good" thing and something we strive for. Done right, all the fixtures can be used without affecting the others.
 

pancho

New Member
Messages
4
Reaction score
0
Points
0
Location
MN
If I add vents to the toilets does the "drawing" otherwise seem to work?
I will be there this weekend to do some measuring and will work on a layout drawing with the actual fittings and pipe lengths I'll be using.
Thanks for the help so far.
 
Top
Hey, wait a minute.

This is awkward, but...

It looks like you're using an ad blocker. We get it, but (1) terrylove.com can't live without ads, and (2) ad blockers can cause issues with videos and comments. If you'd like to support the site, please allow ads.

If any particular ad is your REASON for blocking ads, please let us know. We might be able to do something about it. Thanks.
I've Disabled AdBlock    No Thanks