sealing roof jack

Discussion in 'Plumbing Forum, Professional & DIY Advice' started by chetwynd, Mar 17, 2006.

  1. chetwynd

    chetwynd New Member

    Joined:
    Jul 27, 2005
    Location:
    California
    Hi,

    The project I'm working on is actually electrical, but the same question applies. I have a piece of galvanized 3/4" pipe going down into a roof jack on a garage. Right now it's sealed with some kind of tar or putty or something that looks like it's been there forever. I need to replace the piece of galvanized pipe, and will then have to reseal where the pipe goes down into the roofjack. What should I use? 20mil tape?

    Talk to me fellas!

    THANKS!
     
  2. Master Plumber Mark

    Master Plumber Mark Master Plumber

    Joined:
    Feb 6, 2005
    Occupation:
    Sensitivity trainer...to be caring and loving to a
    Location:
    indianapolis indiana - land of the free, home of
    use silicone

    jsut buy a tube of clear silicone

    it works great
     
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  4. hj

    hj Moderator & Master Plumber Staff Member

    Joined:
    Aug 31, 2004
    Occupation:
    Plumber
    Location:
    Cave Creek, Arizona
    seal

    Or a tube or can of roofing cement.
     
  5. Cass

    Cass Plumber

    Joined:
    Nov 12, 2005
    Location:
    Ohio
    Thoes will do the job.
     
  6. modbit

    modbit New Member

    Joined:
    Jun 26, 2012
    Location:
    Atlanta
    That will work or roofing bull.
     
  7. bluebinky

    bluebinky Member

    Joined:
    Aug 31, 2011
    Occupation:
    Software Engineer
    Location:
    Santa Clara, CA
    Just in case you didn't already know, you should use rigid conduit instead of plumbing pipe for electrical.

    Of course, that has nothing to do with sealing the roof penetration...
     
  8. hj

    hj Moderator & Master Plumber Staff Member

    Joined:
    Aug 31, 2004
    Occupation:
    Plumber
    Location:
    Cave Creek, Arizona
    The only real difference is that electical conduit has a straight thread, but I do NOT think electrical nipples are any different than plumbing ones.
     
  9. bluebinky

    bluebinky Member

    Joined:
    Aug 31, 2011
    Occupation:
    Software Engineer
    Location:
    Santa Clara, CA
    Plumbing pipe isn't "approved" for electrical work. Not a big deal, other than an inspector might notice...
     
  10. kreemoweet

    kreemoweet Member

    Joined:
    Sep 7, 2009
    Location:
    Seattle. WA
    Electrical conduit is deburred, both at the threaded ends and internally. That is most emphatically not the case with the plumbing nipples sold
    most places, which could easily damage wiring pulled thru them. It is a big deal.
     
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