The roof tar has a vent sticking up out of it !!...........definate source of a leak too !!

Let`s flash that tar with a vent, first,...yes,.... the wheather can effect you,..not the season. Now if that first row in front of the vent,with alot of tar on it, had gone on with the hole cut-out, cut,then the vent put on over that row, nailed at the top corners and the nail line on the shingle (threw the metal), then make the vent part of the shingle by covering the flange with Ice-n-water shield or 12 inches of roofing tar on three sides down to the exposier, then the next row cut around it ,applied with roof tar over that headlap then the last row across the back,.....not only would we not see the tar on top,....it wont leak either !!

If you turn your method upside-down,...it wont leak !!

I have tar on all 4 sides. Do I need to open up the bottom seal to allow this water to drain out? is that on of the problems?

This week, I cut a big peice of flashing to go over a lot of the tarred area hoping any water would pass over whatever was leaking. I shoved it about 6 inches under the shingle above the vent and cut it so it was tight against the back and sides of the vent. I used more wet/dry tar beneath this.

it may have helped a little, but not perfect. So if you think it is a good idea, I will open up the flashing on the bottom edge so any moisture has a place to go.

Your leak is do to the first row in front of the vent not sitting under the vent. You are creating a cavity to accumulate rain, snow, fog, or even condensation from the vent itself no matter how much tar on all four sides. If the first row is cut around the hole, placed on first, then the vent on top of that row, the cavity don`t exsist. The vent becomes an attachment of that row, then any other roofing will drain on it without any way of getting under it.

Keep in mind,....any water under the roof from somewhere else on the roof will drop down openings such as this vent. Water does travel horizontally and up hill too.

Do you have any shingles left over ?