I built a new shop and plumbed it for a toilet and sink. My question is, do I need to vent plumbing out through roof. My shop is 26x40 with 10' walls and a aggressive peak. I don't have an attic, its all open. Its a steel framed building and I bricked it and shingled roof. I really don't want to cut into roof. Can I run pipe up a foot or so above restroom or will it not work properly. Shop is only used by me to work on hobbies. Thanks in advance.
Does My Shop Need Plumbing Vent Through Roof
- Thread starter Slim38
- Start date
jimgood
Well-known member
In my barn, the plumber ran a vent tube in the wall that has a check valve. The walls are 10' and IIRC the tube terminated in a valve about 8' up. Been working for 10 years with no odors.
Do a search on "plumbing vent check valve".
Do a search on "plumbing vent check valve".
Last edited:
coljar
Well-known member
I recently went back and forth with the same thoughts with my garage bathroom, thinking I would use an air admittance valve under the sink instead. In the end, I done it right and took it up through the inside of the wall, but I went up the height of the room and out below the soffit, then put a foot and a half stub straight up outside. I like as few roof penetrations as possible. With all that said, I did use an air admittance valve with the shop sink close by, because it would have been difficult to tie it into the vent.
Thanks Jim. I bet that will work. Have you ever had to replace valve or do they last a long time.
zeeway
Well-known member
I have seen some vents done with check valves in kitchen islands - legal to code in some areas.
zeeway
Well-known member
...check out "air admittance valves".
LS6 Tommy
Well-known member
If you don't run it all the way up and out, an air admittance valve is a must. Especially if you don't want your shop to smell like a sewer, forget about the fact that sewer gases can be flammable/explosive. I'd check with your AHJ to confirm it's acceptable.
Tommy
Tommy
jimgood
Well-known member
No. 10 years so far. I don't know what type/brand of valve it was. Do your research and I'm sure you'll be fine.
Stuart in MN
Well-known member
I've seen them used on sinks where access to the main stack was not available, but I don't know if air admittance valves (also referred to as Studor valves) are allowed on the main stack itself. Also, in some areas of the country they aren't allowed at all. You need to do some research on local codes to be sure.
My old house had a vent stack on the outside of the building. Might work for you. One of the reasons for the vent is to vent the whole waste system. As **** decomposes it out gasses and could come back up the drains if it was not vented to atmosphere with the vent stack.
The one way vent valves work to relieve the vacuum created by water flowing down the pipe. They will not replace a vent stack.
lg
no neat sig line
The one way vent valves work to relieve the vacuum created by water flowing down the pipe. They will not replace a vent stack.
lg
no neat sig line
sberry
Banned
It should have a vent, its not that big a deal.
ard
Well-known member
You say you 'plumbed for a toilet and sink'? No need for a vent.
Until you install the toilet and sink.
Honestly, just put it up through the roof. Asphalt shingles? It's a hour futzing with the hole, pry some shingles, cut some tar paper...some mastic.
Until you install the toilet and sink.
Honestly, just put it up through the roof. Asphalt shingles? It's a hour futzing with the hole, pry some shingles, cut some tar paper...some mastic.
RVDan
Well-known member
An air admittance valve can be used on the sink to break the suction created by the water flowing down the pipe so it won't siphon out the P-trap.
An air admittance valve will be insufficient for a toilet. The toilet needs at least a 2" vent to let air out of the pipe to make room for the water and waste, and of course be close enough to the toilet to make sure there's no siphon effect on the toilet trap.
An air admittance valve will be insufficient for a toilet. The toilet needs at least a 2" vent to let air out of the pipe to make room for the water and waste, and of course be close enough to the toilet to make sure there's no siphon effect on the toilet trap.
DFB
Well-known member
Down to farm where I work the vent stack for the plumbing in the old packing house built years ago was on the outside but with all our recent new construction code here dictates thru the roof. The new donut shop/certified kitchen area I built was over a pre existing slab so the sink plumbing went out low on the wall and to meet code with the plumbing inspector I built a little box in area attached to the building with a shingled shed roof and the vent stack goes up thru the "roof" of this little addition of course the pipe is extended past the eave of the main building but meets code!
Right now I'm looking in my files for photo of what I did
Right now I'm looking in my files for photo of what I did
Radix2
Well-known member
Is this building on its own septic? Sewer? Or shared with a house.
A AAV or studor vent is not enough if there is not another vent.
kj_mustang
Well-known member
I had the plumber run the vent stack up inside the cupola on my building so no need to exit through the roof.
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Its on a separate sewer . My uncle helped build shop. He does custom steel buildings for a living and he says that alot of his customers are going the AAV route anymore. I still wanted some opinions though.
RegeSullivan
Well-known member
It's real simple. You can use an aav or you can do it right.
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Sent from my SM-G920V using Tapatalk
James-W
Well-known member
If it were me, I would definitely follow the code and get it done right.
Bib Overalls
Well-known member
In my shop the toilet is located adjacent to the back wall and the 2" vent runs up the outside back wall and terminates a couple of inches above the roof. My building is clad with grey metal and I used grey, UV resistant PVC electrical conduit that blends in. I also have the sink plumbed with a Studor valve. I'm using an old, pre-regulation toilet that has a slow, elegant flush that takes me back to the good old days.