Updating exsisting plumbing

Discussion in 'Plumbing Forum, Professional & DIY Advice' started by naglejob, Jun 10, 2010.

  1. naglejob

    naglejob New Member

    Messages:
    5
    Location:
    pittsburgh, pa
    hello,
    i recently purchased a home. While doing some concrete work in the basement i started to notice a sewer gas smell coming from my drain in the garage. I decided that since i was doing concrete work i would dig up the drain and see exactly what was going on. It turns out that 40 years ago when they built an addition onto my house the built it over the main line trap ( which is normally outside?) and the drain was an open vent to my trap. I talked to a plumber and he thought it would be alright if i just capped it off but then i would lose my garage floor drain, but if i put a trap on top of the trap i would lose my access for snaking my main.... so i am not sure what to do. Also i wanted to replace some of the floor drains in my house and noticed they are all of the bell trap design. If i change them to p traps i am afraid of the problems that might arise from ventilation. Any suggestions?
    Last edited by a moderator: Jun 10, 2010
  2. cacher_chick

    cacher_chick Test, Don't Guess!

    Messages:
    3,249
    Location:
    Land of Cheese
    In some areas floor drains in garages are no longer permitted unless there is an oil/water separator installed.
    Before you change anything I recommend checking with your building inspector.
  3. naglejob

    naglejob New Member

    Messages:
    5
    Location:
    pittsburgh, pa
    Good call, never even considered that one. What about the bell traps?
  4. hj

    hj Moderator & Master Plumber Staff Member

    Messages:
    26,831
    Location:
    Cave Creek, Arizona
    They have been outlawed for decades. Just changing to "P" traps will NOT change the "ventilation", other than the bell traps were probably not working anyway. There are ways to keep the access to the house trap, (although I, and many other plumbers, would remove the trap IMMEDIATELY), and still connect a floor drain to it.
  5. naglejob

    naglejob New Member

    Messages:
    5
    Location:
    pittsburgh, pa
    I don't think I can remove the main trap, I would have to relocate it outside, and that would get expensive.
  6. jadnashua

    jadnashua Retired Defense Industry Engineer xxx

    Messages:
    22,143
    Location:
    New England
    You're missing the point about the main trap...most systems do not have one at all...it's not an issue with relocating it, it's eliminating it altogether. It's an impediment to good flow and a likely problem if you do need to run an auger through the lines.
  7. naglejob

    naglejob New Member

    Messages:
    5
    Location:
    pittsburgh, pa
    I believe the main trap is required in Pittsburgh by code
  8. naglejob

    naglejob New Member

    Messages:
    5
    Location:
    pittsburgh, pa
    talked to a plumber, his suggestions are 1. cap off the drain temporarily to see if my system functions properly
    2. If everythings good just install a finish grade cap and close it up
    ( if i was going to add another floor drain i would have to move my main trap outside, this would involve ripping up my driveway cost hundreds...)
    He also said the floor drains in the house could be changed over to p traps and if they don't already have traps hooked to them, this would cause no problems

    Thanks for all the help Terry!
Similar Threads: Updating exsisting
Forum Title Date
Plumbing Forum, Professional & DIY Advice 1929 House updating Bath plumbing layout Sep 22, 2014
Plumbing Forum, Professional & DIY Advice Advice on updating old drain plumbing to current code. Nov 1, 2011
Plumbing Forum, Professional & DIY Advice need advice on updating boiler system Feb 20, 2007

Share This Page