I have a 4 inch pvc vent pipe that goes from the basement , through the
attic and out the roof. Sticks up about 3 feet. When the wind blows it
vibrates or sings. I can hear it vibrate in the bathroom and feel it in
the basement. What can be done to stop this? The top is cut off square.
Maybe cut it at a 45? or cut a notch in it?
I'd try a 30ฐ cut first. Can't hurt anything and it would change the
harmonics. You can always buy a coupling and cut that on an angle and slip
it over the top to try it. Or just wrap it with some thin sheet metal to
see if it helps. You don't want the cut angle to act as an air scoop. I
don't know if it would or not, but make the cut on the leeward side anyway.
4 inches is code in most places. Even if a smaller vent is legal for that
part of the system it has to be increased when it goes through the roof. And it
can't be covered with a screen as it could collect debris or snow and block the
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