Roof Pipe Flashing Installation: 3 Tips

What You'll Need
Putty knife
Roofing nails
Flat pry bar
Urethane caulk
Work gloves

Occasionally your roof pipe flashing will need to be replaced. It is especially good to do this prior to winter or the rainy season. We are going to walk you through this process one step at a time and give you some tips that will help you to avoid common mistakes when replacing the flashing.

Tip 1 - Removing the Old Flashing

You want to do this without damaging any of the shingles that may be attached to the flashing in any way. Damaging the shingles could cause a leak to occur. Make sure you are wearing your gloves to protect your hands. Using the pry bar, bend back the shingles at the vent pipe above and below. Then very carefully remove the shingle around the flashing itself. Do not damage this shingle. Pry the nails out of the old flashing and pry it off the roof pipe. It should come off clean.

Tip 2 - Installing the New Flashing

Slide the new flashing over the top of the vent pipe making sure that you only slide it under the side and top shingles. Turning the flashing as you push it down onto the pipe will help it go on smoothly and help insure a snug fit. Now fit the cap on top of the flashing and make sure it is secure and snug. Using the roofing nails, secure the flashing under all the shingles you pulled back. Hammer the nails into the top and side of the flashing, do not hammer into the shingles. Make sure to leave the flashing laying on top of the shingle below it. This will make sure that the wet will slide down over and not under the shingle.

Tip 3 - Finishing Up

Now hammer the nails in the bottom edge of the flashing. Cover all the nail heads with the caulk or roof cement. Now go around all the edges of the flashing with the caulk. Recover the the flashing with the shingles and make sure they are laying flat again.

Additional Tips and Mistakes to Avoid

Check all the other shingles in the area around and make sure that there are none sticking up or that need to be replaced. When a roof is installed usually have left over shingles that you can make this repair with. Also, if you happen to tear the shingles that you pry up, you can replace them with new ones if needed. While you are prying up the shingles be sure to do so slowly and not rip them up. When you are installing the flashing, be sure it is snug against the bottom and not leave a gap that moisture can get under. Do not leave the nail heads without putting caulk around them. They will leak and cause damage inside you home. The last thing to remember is to put the caulking all around the edges of the new flashing. If this is not done properly it will not only cause a leak, but the wind and weather can rip it up and you will have to reinstall.