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Thread: Is my bathroom vent designed properly??

  1. #1
    DIY Member Gnfanatic's Avatar
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    Default Is my bathroom vent designed properly??

    Hey guys, now that my heating system is done I am working on my gutted bathroom. I will be filing for a permit this week and be doing the work myself. I never plumbed a bathroom from scratch before so I am working at one step at a time. The sink, toilet and tub are against the exterior wall. Instead of touching the insulation and drilling holes I am building a another 2x4 wall in front of it for plumbing purpuse's. All vent piping will be 2inch's and it will be 3 inchs in the attic coming out of the roof (6 inchs of roof line). The horizontal pvc is above the sink by 8 inchs. Does this design look right? I know it is very vague, just looking at the basics right now.

    thanks!!!!
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    Ralph

  2. #2
    Forum Admin, Expert Plumber Terry's Avatar
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    The sink can use a 1.5" vent
    The tub/shower can use a 1.5" vent
    The toilet uses a 2" vent

    Revent at least 6" above flood level of highest fixture. That would be the lav.

  3. #3
    In the Trades Tom Sawyer's Avatar
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    If he's IPC the entire group can be vent 11/2" for that matter two bath groups can be vented with one 1 1/2

  4. #4
    DIY Member Gnfanatic's Avatar
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    Hey guys, thanks for the reply I truly appreciate it. I am going to call the town today and ask if i can vent everything 2 inchs to make life easier for me. I understand about the horizontal tubing being above the highest flood point at least 6 inchs. The tricky part is the 4 inch drain I need to build runs directly at the bottom of this wall and floor joists horizontally. I will take some pics and hopefully you guys can give me ideas.

    thanks again and have a great day!
    Ralph

  5. #5
    DIY Junior Member Bob Lewis's Avatar
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    While I have gotten good advice from the board I have found the best advice I have gotten is from the person who will be doing the inspection. If you are getting it inspected get a detailed enough drawing of exactly what you plan to do and contact the inspector. In my case the guy was very clear about what he wanted to see and how it would be tested so it took any and all guess work out of the equation.

  6. #6
    Moderator & Master Plumber hj's Avatar
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    In most cases, he will NOT get a permit until he submits a "detailed drawing" of how he intends to install the drains and vents. Vents are easy, ONCE you have the drains installed properly. Our inspectors are NOT in the business of designing plumbing, or any other, systems. They will "reject" incorrect drawings and expect YOU to make any corrections before resubmitting them.

  7. #7
    DIY Junior Member Bob Lewis's Avatar
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    Let me rephrase that then. If you can get a permit without a detailed drawing get the permit and make a detailed drawing and submit it to the inspector. If you can't get the permit first make the detailed drawing and submit it. If it is rejected they will need to tell you why. Fix what they have rejected, resubmit, get it approved, then move on with the plan. Talking with the inspector will also be helpful in that you will know how they plan to test the system. The inspector I have dealt with would much rather have it done right rather than coming to inspect it and have you rip it all out because its not.

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