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Discussion Forum

How do you fix a hole in cast iron vent?

| Posted in Construction Techniques on May 5, 2003 04:52am

A previous washer installation used a saddle into the plumbing vent. Taking the saddle off will leave a nice sized hole which I would like to seal. How is this done?

Wealth is not created, it’s consolidated.

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Replies

  1. Houghton123 | May 05, 2003 05:18am | #1

    WARNING: I have no idea what the building inspector would say.  This is just what I'd do.

    If it's actually a vent, as opposed to something carrying water, you could probably get away with just a piece of sheet metal caulked in place with silicone caulk, and wired or zip-tied in place while the caulk dried.

    This last January, our son was replacing an old laundry tub in our back entry (let's call it a mudroom -- far more elegant and accurate) with a proper sink, and found that the laundry tub drained into a hole whacked in the cast iron drain line from the toilet, then mortared in place (!).  The hole was close enough to circular that a test plug, tightened thoroughly, sealed it up fine.  The sheet metal/caulk approach wouldn't have worked, both because the line was still in use and because it was darned hard to get to, and wiring around it was out of the question.

  2. User avater
    JeffBuck | May 05, 2003 05:27am | #2

    can ya slip on a fernco?

    Jeff

    Buck Construction   Pittsburgh,PA

     Fine Carpentery.....While U Waite                  

  3. Edgar76b | May 05, 2003 05:27am | #3

    In my Country.....green Banana. Oh no sorry thats how we fix car radiators sorry.  lol Hey i don't know the inspector either, but maybe you could use some of that PC-7 . You know the stuff on display at the Hardware store with the golf ball glued to th side of the glass soda bottle etc.  i used it to fix an antique grinderbase once. It worked great. maybe you could cut a patch out of a slightly larger size pipe or even PvC. Then you can use some oversize hose clamps to hold it in place. after it drys. take them off and grind the edges smooth and paint the D**n thing.

    Thats what i would do after consulting with the president of course.

    Where there's A wheel there's a way, got any wheels?

  4. Wet_Head | May 05, 2003 07:14am | #4

    duct tape and silicone

    at least that is what I see many people do

    wanna do it right?  cut it out and replace that section.  use no hub clamps.  PVC is fine for the new piece.

  5. noone | May 05, 2003 08:37am | #5

    The correct way is to cut it out and replace the piece with a two couplings and a short piece of pipe. This is overkill if it is not going to be inspected. Take a rasp and smooth out the inside edges then run a bead of silicon around the hole and  use piece of sheet metal with a couple of screw clamps (radiator hose clamps) to secure it in place. I've done it a hundred times and never had a problem.

  6. CesarNicolau | May 05, 2003 09:25pm | #6

    Thank you all

    Wealth is

    not created, it's

    consolidated.

    1. DanT | May 05, 2003 10:59pm | #7

      Clean it, put a layer of auto body putty around the hole and lay a piece of screen across the hole and into the putty.  After it sets up add another layer of putty.  nice patch.  Can sand and make pretty if you like.  DanT

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