Does anyone know what this 4 inch pipe on the outside of my house could be for? It has a concrete base around it. We are installing an egress window that is next to this and wondering if this pipe is functional for something else.

Pipe outside of house

  • Have someone flush a toilet while you listen for noise. It may be a vent that someone cut off or a clean out without a cap.
    – Ed Beal
    Commented May 6, 2020 at 16:45
  • Have you usef a fish tape or other means to see how deep it goes? Are you in a community where some people use well water? Does it look like someone did a cut at the top of the pipe? Commented May 6, 2020 at 16:49
  • 3
    Any chance it's for a flag pole or a pole for a sail awning?
    – JACK
    Commented May 6, 2020 at 17:25
  • 1
    The "bent over part" looks like damage/wear common for a post base in the direction the post is laid down or stood up from.
    – Ecnerwal
    Commented May 7, 2020 at 1:25
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    Turns out it was just about 3ft deep. When we dug it up, it was encased in a large 3ft x 3ft block of concrete. Very odd, but seemed to be a pole of some sort.
    – Logan
    Commented May 7, 2020 at 19:35

2 Answers 2


Quite possibly it was a pole for a clothes drying line that was cut off once no longer needed.


It could be for radon.

Half your state has a lot of radon and the other half has more than normal.

I’d verify before installing an operable window that could allow gas back into the house. In fact, just to be safe, I’d move the window.

  • Yeah, it definitely wasn't a radon mitigation system, I am familiar with those too. There was an existing window there and we were replacing it.
    – Logan
    Commented May 8, 2020 at 12:51
  • Usually radon pipes are extended up to a dry location so the airway remains open...but just an idea.
    – Lee Sam
    Commented May 8, 2020 at 14:31

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