Freezing Vent Pipes on Roof

Discussion in 'Plumbing Forum, Professional & DIY Advice, Tips & ' started by floerchinger, Feb 5, 2007.

  1. floerchinger

    floerchinger New Member

    Messages:
    3
    My husband and I live in Iowa where our winter weather has turned extremely cold (currently 7 degrees). Our home has two 3" vent pipes and one 2" vent pipe on the roof coming from our bathrooms/kitchen. Over the last week, each of the pipes have frozen over. When this happens, our basement smells of sewer gas. To eliminate this problem, we have had to climb up on the roof and pour hot water down each pipe to unfreeze them. Any ideas on how to eliminate the vent pipes from freezing (aside from not using any hot water)? Any suggestions will be greatly appreciated. Thanks.
  2. Rancher

    Rancher Guest

    Frozen over... I assume because of snow? I don't know if this is legal or to code, but you could dry fit 2 street ells to the top of the vents, that should keep the snow out.

    Rancher
  3. floerchinger

    floerchinger New Member

    Messages:
    3
    Thanks for your response. However, they freezing is not due to snow, just frigid temperatures. The steam rising up out of the pipes freezes when it reaches the roof line and causes the pipes to freeze over.
  4. Rancher

    Rancher Guest

    Heat tape down the vents?

    Rancher
  5. plumber1

    plumber1 Plumber

    Messages:
    1,423
    Location:
    Florida
    It's not snow, it's steam coming up the vents, condensing and freezing.

    Next summer change all the vents so that 4" pipe comes through the roof.

    Don't take long showers.

    Wrap a short heat tape around the vent pipes.
  6. floerchinger

    floerchinger New Member

    Messages:
    3
    Thanks for the advice. I sure hope it works.
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