How to Attach a Roof Boot

What You'll Need
Peel and stick roof boot
6-inch knife
Primer tape
Silicone roller

If your pipe vent is allowing water to penetrate the inside of your home, you may want to install a roof boot. Roof boots are designed to create a water tight seal around the diameter of a pipe vent. This helps keep water from seeping into your roof from the pipe vent. There are a number of ways to install a roof boot. You can install a new flashing with a built-in boot. However, this job is very involved and requires the removal of shingles. The average do-it-yourselfer will find installing a peel and stick roof boot a much easier task. With a few materials from your local home improvement store you can add roof boots to all of your pipe vents.  

Step 1—Clean Pipe

The pipe that you plan on fitting with the roof boot needs to be clean and free of old caulk, sealant, and debris. A 6-inch knife usually works well to remove the hardened material. It is best to take the extra time to clean the pipe because you want the roof boot to create a water tight seal free of gaps and tears. Pay extra attention to the area where the boot will be placed. It is imperative that this area be clean and dry so that the boot creates a tight fit.

Step 2—Cut Roof Boot to Size

The peel and stick roof boot comes ready to use for any size pipe vent. You will have to cut it to size. First, you’ll need to measure the diameter of your pipe vent. Once you have an accurate measurement, you can look on the top of the boot, for a small guide. The guide will instruct you exactly where to cut the boot. It is very important that you take accurate measurements before you cut the boot, because once it is cut inaccurately you will have to buy a new one and start over. 

Step 3—Fit the Roof Boot

Now that you have the boot cut to size, you will need to pull the boot over the pipe. The underside of the boot should be covered in paper. Under this paper there is an adhesive that will seal the boot to the pipe. 

In the package with the peel and stick roof boot, you should find a roll of primer tape and a clamp ring. Apply the primer tape the base of the pipe vent. If there is flashing on the base, you should cover that as well. You’ll want to take the tape out at least 10 inches in all directions.  

Step 4—Adhere to Pipe Vent

Remove the paper from the back of the roof boot and press it down to create a tight seal. If you have a silicone roller on hand, you can roll the surface of the boot with the roller to ensure a tight fit. 

Now that the boot has adhered to the surface, you should roll down the top lip of the boot and apply mastic to create a water tight seal along the top of the boot. Once the mastic has been applied, clamp the tip of the boot with the adjustable clamp ring.

For extra protection, many professional roofers add a rain and repair collar to pipe vents. This adds another form of water penetration and also helps to keep your new rain boot in working order.

That’s it. The peel and stick roof boot has been applied and will keep your pipe vent free from water penetration.