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Discussion Starter #1
After hurricane sandy destroyed my basement with backed up sewer water, we decided to put a backwater valve on our main sewer line. Our main sewer lines comes into the house about 2' below our basement floor, and is accessible in a "pit" near the front of my house. Coming into my house I have a 4" cast iron pipe, which then attaches to a double trap ( it has two clean outs) then there is a tee which goes to a vent. the vent and everything after that is PVC. I have been told that plumbing codes no longer require traps on the main sewer line by some plumbers, others tell me I need one. I am located in Staten Island, NY. I would be very happy if I was not required to have one, because I could take out the trap and Put in the backwater valve. If I need the trap then that means a LOT of breaking of cement. Any advice on how to proceed? Should I take out the trap? The house is about 15 years old. There are no drains without traps anywhere in the house.

Thank you!
 

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You will need to check your local building code or plumbing code. In general a master trap for the building is not needed nowadays.
 

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I was surprised to reach the end and see that your house is only 15 years old. I usually only see house traps on much, MUCH older buildings. But, as AllanJ said, you'll have to consult your local plumbing codes and/or inspector.
 

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Discussion Starter #4
Thank you - the building department is insanely jammed over here with all the hurricane damage. I asked four plumbers now. 2 say yes and 2 say no... I need a tie breaker...=)
 
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