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We are replacing shingles on our roof and need to find out if the covers for the exhaust fans on top of the roof need to be installed before or after the shingles are installed.

  • I put all the vents down first then cut the shingles around the vent or pipe. Keep any tacks at least several inches above the pipe or this can be a leak point when leaves or needles help to back water up on the top side of the pipe. I may have misread , if this is the upper section of a vent and the attachment points are above the shingles it is easier to put the tops on after the shingles. – Ed Beal Aug 22 '16 at 22:52

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