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How To Flash a Vent Pipe - Pg. 1


Before you begin, make sure you have all the right tools and equipment. Here's a sample list to help you:
  • Shingles
  • Hammer
  • Roofing Nails
  • Utility Knife
  • Hook Blades
  • Lead Roof Jack


hammer.jpg (1827 bytes) Roofing Nail.jpg (1364 bytes) utility knife.gif (4958 bytes) hook blade2.jpg (3078 bytes)
Hammer Roofing Nails Utility Knife Hook Blades
lead jack.jpg (5285 bytes)
Lead Jack


If you aren't real familiar with the anatomy of a shingle, you may want to visit https://www.roofhelp.com/3tabpage.htm.

ventpipeflash1.jpg (16403 bytes)

This is generally how the roof will look when a vent pipe is ready to be flashed. The underlayment nails are shown to give an idea of how to properly nail down the felt underlayment. The spacing between the underlayment nails should be about 12 inches.

First, we'll check to see if we can install another shingle. It looks like it will be close.

ventpipeflash3.jpg (15408 bytes)

Since another course of shingles fit without having to make any cuts, let's move on to the next step.

ventpipeflash3.jpg (15274 bytes)

What we're doing now is checking to see if the flange (flat part) of the jack will come down far enough so that it extends down onto the exposure (visible part) of the shingle. Take the lead jack and slip it over the vent pipe (the dotted red lines indicate the vent pipe). See how the flange doesn't come down far enough onto the exposure? We need to add another shingle. Remove the pipe jack.

ventpipeflash4.jpg (13495 bytes)

Take a full shingle and butt it up against the downslope side of the vent pipe. Mark where the shingle needs to be cut. We can mark it with a lumber crayon, scratch it with a blade, whatever is convenient.

ventpipeflash5.jpg (14840 bytes)

Now butt the shingle up to the side of the pipe. Make sure it lines up with the next course of shingles. The blue circle indicates where we want it to line up. Make a mark where the downslope side of the pipe lines up with the shingle. The mark is indicated by the small red line.
ventpipeflash6.jpg (7054 bytes) The dotted red line in this picture shows the approximate shape of the area we want to remove from the shingle. Let's remove it now.
ventpipeflash7.jpg (6915 bytes) Here's the shingle with the piece removed.
ventpipeflash8.jpg (17339 bytes) Now we'll set the shingle in place and nail it down.
ventpipeflash9.jpg (15795 bytes) Now let's go ahead and put another shingle in that same course. We're going to have to cut it, too.
ventpipeflash10.jpg (6635 bytes) Let's go ahead and make our mark and cut it. It will look something like this.

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