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kahuna

01:44PM | 07/23/04
Member Since: 07/22/04
3 lifetime posts
Bvplumbing
I'm remodeling my garage bathroom from a 1/2 to full (adding a shower). I've had several plumbers come by to give me an estimate on connecting the water supply & drains. I thought it would be an easy task since I've already broken the concrete slab for them & the main stack is located just a couple of feet from the existing sink & toilet. But they're saying it's a major project because there's no existing vent pipe & one of the bedrooms is on the floor above, so they would have to get creative in running this to the roof. My questions are (1)There doesn't seem to be any vent pipe now, so why put one i? The laundry room is adjacent to this bathroom wall & there's no vent pipe there either; (2)Can the pipe be bent to run horizonatlly across the garage, to an exterior wall & up to the roof w/o breaking thru my bedroom; (3) Are the sewere fumes that bad or can the pipe just poke thru the house w/o being run up to the roof?

Thanks in advance for your response.

erkinator

08:13AM | 08/31/04
Member Since: 07/28/04
60 lifetime posts
you should always realize that when water goes down the drain it also needs air to help it go down properly.If there are no plumbing fixtures above this area I suggest to them in using a Studor vent system.This is an in wall or under cabinet venting system used in many log homes.This system has been around for 10 years or so.If they never heard of it then they are looking to take extra money out of your wallet.

LonnythePlumber

08:44PM | 08/31/04
1. Sewer Fumes are bad. Methane. In Wichita we had a house blow up about six months ago from a faulty septic system filling the house with fumes and exploding.

2. Venting is often the hardest in projects where you are adding facilities. A vent to the open air allows the drain to breath. Without a vent it is like turning a pop bottle upside down. It will get out but you get a lot of problems.

3. Air Admittance Valves have traditionally only been approved for use in rare instances by the administrative authority. They only let air go one way, they have to be replaced and you don't get the best drainage. I consider it an honesty for a licensed plumber not to try to get away with installing an AAV instead of a real vent. If you did that to a customer in my jurisdiction you would receive a fine and sometimes go to court or before our plumbing board.

4. Your idea of running across the basement seems workable on the face of it. The Uniform Plumbing Code permits a 2" vent to have a total length of 120 feet of which 40 may be horizontal.


kahuna

06:08PM | 09/04/04
Member Since: 07/22/04
3 lifetime posts
Here's a thought. Since the main stack is located just a few feet from the sink & toilet, and that vents through the roof, can't I just tie the vent for sink & toilet into that?

LonnythePlumber

08:33AM | 09/05/04
You can tie your vent into a vent. If you tie your vent into a drain then you can get upstairs poop in your downstairs fixtures. Some don't like that.

A vent generally doesn't begin until above the top fixture in a structure. I presume this stack is the drain for some fixtures on the floor above the bedroom. You would need to tie your vent in 6" above the flood level rim of the fixture on the top floor. A kitchen sink is usually 36" above the floor so you tie your vent in at 42".

I'm surprised the basement toilet and washing machine worked okay without a seperate vent.

I believe I would give you the same speech your local plumbers are. The best most reliable system is to remove wallboard in the room above and pull the toilet or sink on the top floor to tie in there. Some put the pipe in a corner of the bedroom and paint it or close it in.

In adding a basement bathroom in this situation, adding the vent probably would have cost more than drain and water so they left it out because it would have stopped the job.

Since you broke your own concrete you are likely to come up with a good plan to get a real vent installed.

kahuna

09:11AM | 12/08/04
Member Since: 07/22/04
3 lifetime posts
How about running the vent outside of the house, along the wall, to the roof? It would be the back of the house, so wouldn't be too noticeable & easier than going through the floors of my house.
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