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Sewer pipe im installing a new sewer pipe and wonderind how much fall it needs

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  • miltonl Mar 26, 2009

    hi harvey

    i wonder if you can help me !!

    my sewer pipe is about 2 inches lower than the outlet to the public sewer what are my options ?

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Hi sir simon,

I'm Harvey the Master Plumber.

Your problem is: You're installing a new sewer pipe and wonderind how much fall it needs

1/4" per foot. You can buy a plumbers torpedo level to make it easy. You'll see 4 hash marks on the tube. Center the bubble in the middle and the pipe is level, so just adjust the pipe so that the bubble is just touching the outer line and you've got 1/4". No measureing. And it only costs a few dollars.

Feel free contact me again!
Please give me a rating here at fixya.com before you sign off
Thank you,
Harvey your Master Plumber


Posted on Oct 03, 2008

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Sewer smell in house since installing the new toliet and the toliet gurgles when the washing machine is on. It started with the new toliet now the gurgling and smell is also present in another bathroom.


It sounds like a vent problem.
On top of each house is a vent stack.
There should be a vent stack above each toilet, and above kitchen sink.
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When you run a column of water down a drain, the vent stack lets air flow in front of and behind the column of water.
This air flow prevents the gurgling sound.
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If you have a two story house, there are vents that run between floors to prevent the air flow from gurgling or bubbling sewer air into each drain as water column moves down pipe.

http://www.bradyinspects.com/plumbing-vents.html
http://chestofbooks.com/home-improvement/construction/plumbing/Standard-Practical/Venting-Part-3.html

Look for bird nest over vent pipe on top of house.
Run a snake down into pipe from roof and see if the is a stoppage.
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Did you connect the sanitary pipe stack to the sewer line that takes away the flushed effluent? Check to see that the pipe is connected, not leaking sewer gas, not plugged up with an animal carcass, and that the pipe extends through your roof three feet past the roof line (keeps smell out of house).

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How do i get the collars of a ''y'' over the cut ends of the existing sewer pipe where I need to install the ''y''? I'll dig down 24'' to the existing sewer pipe but I don't think it will move or flex...


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Fowl smells related to plumbing can have several causes. Here's a few potential issues that you can check. If none of them solve the problem you may need to call a plumber.

1) Look at your pedestal sink drain connection. Is there an an elbow connecting to your drain or a P Trap? A p trap is a pipe shaped like the letter "p" (hence the name) and it prevents sewer gas from rising into the bathroom. **sometimes an apprentice plumber puts in a pedestal without a p trap because they are fairly difficult to install, and ALL fixtures need P traps. If there is no P trap, then you need to put one in. It will be a tight space, but you may be able to do it yourself.

2) Do you have a floor drain? If so, your sink will need a trap primer at the drain. Or you can pour water into the drain from time to time before it evaporates from the trap

3) If the smell is more of a sulfur type smell and it appears from running water in other places in the house, then it could also be due the type of tank you have if you are on well water

My offhand guess is that number 1 is your issue.

Without further info, those are some of my best solutions so far, but if none of these are potential solutions, then make the following tests

1) close the door to the bathroom and leave it for an hour or two. Return to the room. Do you smell sewer smell? Is it in the entire room or more concentrated in a certain area? If you don't have a floor drain and its everywhere, there could be a missing P trap from a fixture, a lose toilet flange, a cracked drain pipe
2) without running water, smell your drain. Does it have a sewer smell? Then the P trap either is not present or you need to clean the drain with a drain cleaner due to a list of reasons
3) run water. does the sewer smell increase or does one suddenly appear. Is the smell more a different odor than sewer. See if it is the water itself. If so, check other places. If they do not have the smell then you may have recently installed your sink and there is some smell related to the new valve. Then you would need to use it some more until it disappears.

Check the top list, though because I really think you're just missing a P trap

Sewer breaks below the slab, an open pipe somewhere, some issue with the water supply, are among some other issues but that depends on the test

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When you have problems with sewer gas smells around a
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1. Sewer gas coming back up into the home
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b. No vent.
2. Leaking drains that cause rotting below the floor.
3. Moisture that causes mold buildup.
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If there is a vent, the pressure is relieved up to the
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If your drains are partially clogged it can work
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If your fixture is not set right or is wabbling, the
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Make sure before you call a plumber to check
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