If the tar has penetrated the protective mineral granules leave it alone or you might remove the granules.
How to tar a roof vent.
Go into your attic.
Tar roofs are often topped with gravel which can quickly wear down standard saw blades.
Roofing tar itself melts when heated and can stick to and gunk up blades.
Check around the edges of your attic for any wiring.
Lay the tarp out flat over the roof.
Use small amounts and apply it with the roller in short smooth strokes.
As you work you will move back toward the end where your ladder is taking the bucket with you.
Let the rest of the tarp hang off the lower border of the roof that overhangs the wall known as the eave.
Lay the tarp across the roof so that at least 4 feet 1 2 m lies on the sloped part of your roof on each side known as the peak.
Tar the roof keep your tar bucket close to you as you start spreading the tar on the surface with the roller.
Cut a piece of roofing membrane with a utility knife to cover the pipe opening in the roof and the now bare area where the flashing was on the roof.
Flake off sporadic drips and dollops of tar from asphalt shingles with a plastic scraper.
Cut a hole in the center of the roofing membrane.
How to cut through a tar roof.
Drive a nail through your attic to mark where you want your vent.
Never lay the tarp out during a storm.