How to Replace Roof Pipe Flashing when Reshingling How to Replace Roof Pipe Flashing when Reshingling

What You'll Need
New roof pipe flashing
Collar (optional)
Roofing nails
Roofing cement/caulk
Asphalt flashing cement
Caulking gun
Scrap block of wood
Safety gloves
Pry bar or crowbar

If you will be reshingling the roof of your home, it is also a good idea to replace old pipe flashing as well. Over time, pipe or chimney flashing can develop leaks and it is much better to do it before you lay new shingles. Doing the work yourself is much easier than you might imagine, and this easy to follow how-to guide will walk you through the process. Let's get started.

Step 1 – Set Up Your Ladder

Place your ladder against the wall that is closest to the roof pipe you'll be working with. Make sure that your ladder is not placed over or near any electrical wires or in an area that makes it dangerous for you to work. If possible, you'll want to replace the pipe flashing while standing on the roof and not on the ladder. However, if you must replace the pipe flashing while standing on the ladder, make sure that you choose a location that is flat and safe to anchor your ladder.

Step 2 – Remove the Shingles

Before replacing the pipe flashing on your roof, go ahead and remove all of the shingles. This will make it much easier to work with the pipe flashing.

Step 3 – Remove Old Pipe Flashing

After you remove the shingles from your home, you can go ahead and start removing the old pipe flashing. To do this, take a pry bar and slip it under the edge of the old pipe flashing. Then, slide a scrap block of wood under the pry bar. Gently pry up the old pipe flashing until you loosen the cement or adhesive used to hold it in place. Then, simply lift the pipe flashing up and off of the pipe. Be careful not to knock the pipe out of alignment. If there are any stray nails in the pipe area, remove those with the pry bar as well.

Step 4 – Insert New Pipe Flashing

If the type of pipe flashing you are installing and requires a pipe collar, go ahead and slide it over the pipe at this time. Simply slide the new piece of pipe flashing down over the pipe. Once you have correctly positioned the flashing at the base of the pipe, secure it with nails. Then, use flashing cement to seal the nail holes and edges.

Step 5 – Seal Base of the Pipe Collar

If you installed a pipe collar for your flashing, use asphalt flashing cement or roofing cement to seal the collar as well. When applying the cement, apply a generous amount and make sure to smooth it out so it is flat and even. Check to ensure that you seal all edges and nail or screw holes.

Step 6 – Install New Shingles

Now you are ready to install the shingles on your home. When you get to the pipe area, simply cover the flashing as you would any other part of your roof.

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