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HomeInstallHow To Install Vent Pipe Flashing On Existing Roof

How To Install Vent Pipe Flashing On Existing Roof

How To Unclog A Roof Vent Pipe

ROOFING REPAIR – How To Replace Pipe Flashing

When the vent pipe is clogged, the issues can manifest in various ways. Foul odors emitting from drains, and sinks and toilets that wont drain are signs of vent pipe issues. Many things can clog a vent pipe:

  • Leaves, branches, or other debris
  • Bird nests
  • Bird or rodent remains
  • Baseballs or tennis balls

If your vent pipe is clogged, there are two ways to clear a roof vent pipe unclog it yourself or hire a professional plumber.

Why Is My Vent Dripping Water


Mandita Erkiaga

How to Find a Leak in a Sewer Vent Pipe

  • Open the drain system at the cleanout point.
  • Block the sewer pipe on the outflow side of the cleanout opening.
  • Fasten a smoke-generating machine to the cleanout opening.
  • Look for points where the smoke exits the piping system within the home.
  • Block the sewer vent on the roof.
  • Riasat Mendigoyen

    Vent Pipe Flashing Is Durable And Easy To Install

    Posted By: RoofingAdminNovember 8, 2017

    Quarrix offers the Pipe Boot, a durable vent pipe flashing that is compatible with PVC and other vent pipe materials. According to the company, the product offers roofing contractors a durable yet easy-to-install way to elegantly camouflage, cover and protect plumbing vent pipes while also withstanding freezing temperatures and rodents.

    Pipe Boot is made of all-steel construction and engineered to withstand frigid temperatures and frost damage via a patented design that allows air space to circulate properly, while still resisting freezing. According to the manufacturer, the product has passed vigorous 110-mph, wind-driven rain testing. Additionally, installation is quite easy as Pipe Boot simply slides over the existing venting pipe, nails into place, and then the top is twisted to form a weather-tight seal. No specialty tools are needed.

    The telescoping sleeve allows for varying pipe heights, pipe widths and roof pitches and comes in four color options. It is paintable to coordinate with any roof color so vent pipes are cleverly camouflaged. Pipe Boot base sizes are available in both standard and high-pitch sizes for a custom fit.

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    How To Install Roof Flashing In 2021

    Roofers use roof flashing to ensure no water leaks into areas of roofing features like vents, chimneys, dormers, skylights, etc. Its critical during roof installation to avoid any damage in the future and helps uphold the integrity of a new roof.

    However, flashing may need to be replaced throughout the lifespan of a roof, so we will walk through the steps of installing or replacing roof flashing. Pay close attention to keep your roof safe from leaks and water damage.

    How Do I Determine The Height Of My Chimney

    How To Install Vent Pipe Flashing On An Existing Roof ...

    You can use our Chimney Height Calculator to help you choose which product will best suit your application. Please note that we recommend a minimum 24 inches above any roofing material and 42 inches above any framing members . If you need further assistance, please feel free to reach out via phone or email.

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    What Is The Warranty On This Product

    Our chimney kits are backed by a 20 year limited warranty, which covers any defects in materials and workmanship from date of purchase. Please note that damages caused by improper installation or other modifications will not be covered under our warranty agreement. Damage to your property may also cause an exclusion from our warranty agreement.

    Choosing The Right Roof Flashing

    Other factors youll need to consider include:

    • Pitch of the roof. If the homes roof is flat, then you will need to use flashing that accommodates a 90-degree pipe angle. However, a roof that is pitched requires flashing that is angled and designed to work with the amount of the roof pitch.
    • Location and climate. To retain its water-tight seal, the flashing must be able to handle the expansion and contraction of the roof through a variety of temperatures. It must also withstand constant exposure to UV rays without becoming brittle. If the home is located near a source of salt water, then the flashing should feature a galvanized base or a coating to help prevent corrosion.
    • Size of the vent pipe. To ensure a water tight seal, choose a flashing with an opening slightly smaller than the pipe size exiting the roof. Using a flashing with the same size opening as the pipe or larger will not create a water tight seal, allowing water to leak into the attic.
    • Specialty applications. Some homes will require specialty flashings, such as side flashings. Side flashings can be used for plumbing, electrical and HVAC pipes that exit the side of the home rather than through the roof or over solar posts. In applications where the integrity of the flashing is in good shape but the rubber boot is not, Oateys Rain Collar for No-Calk® Roof Flashings can easily be installed over the existing rain collar to restore its seal.

    Also Check: How To Build A Pergola With Metal Roof

    How The Vent Pipe Flashing Works

    Most newer homes will have a flexible vent pipe flashing that is made of aluminum and a rubber seal that the pipe passes through. This type of flashing is common and inexpensive for the contractor to install because one flashing unit can fit pipes from 1-1/2 inches wide to 3 inches wide and there is no custom work needed to size the flashing.

    When the shingles were originally installed the vent pipe was already in place protruding from the roofing plywood decking. The contractor that installs the shingles should have laid down a piece of roofing tar paper and then shingled up to the bottom of the vent pipe.

    When you reach the vent pipe you then insert a vent pipe flashing and continue adding shingles around and above it as normal.

    Diy Vent Pipe Unclogging

    How-To: Shingle around a vent pipe Flashing

    If you decide to unclog it yourself, start by cleaning any debris around the vent pipe. Remove any blockage you come across and use a plumbers snake if you find any debris that you cant reach. Feed a hose down the vent and carefully turn on the water to push the remains down the drain.

    If youve never done this before or are unsure where the problem lies, its always best to leave it to a professional contractor. You can find verified and trusted plumbers on popular sites such as Angies List or similar internet services companies. A professional can save you from potential injury and ensure a clean job.

    Read Also: How To Install Snow Stops On Metal Roof

    Other Types Of Roof Flashing

    If youre in need of vent stack flashing, your roof may be in need of other types of flashing as well. Of course, the best way to tell would be for an expert to look at your roof. Here are the kinds that come in pre-formed styles, so they can be installed more easily:

    Valley Flashing This type is typically formed in a V or W shape, and its used where two different planes of the roof meet to form a valley.

    Step Flashing This type is made to protect the joints between roofs and other objects like skylights and chimneys. Its called step flashing because it steps up above the shingles and attaches to the object, which helps to provide comprehensive water protection.

    Drip Flashing This type is installed on the edge of roofs, which helps guide water into your gutters and away from your roof. Drip flashing includes two types: T-Shaped and L-Shaped. T-shaped overlaps edges on an existing roof to let water drip off more easily. L-shaped is used when youre beginning to install flashing on a roof in areas where the wall and roof meet.

    How Do I Clean My Chimney

    Our primary recommendation is to contact a professional chimney sweep service. If you choose to attempt it yourself, we recommend using a brush and scraper as well as an ash vacuum such as the Ash-Away Cleanout Tool. Please note that this tool should not be used with pellet stoves, since the high temperatures could cause damage to your chimney kit.

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    Installing The New Vent Pipe Flashing

    Now it gets a little tricky to install the new vent pipe flashing you first need to work the opening of the rubber where the pipe will pass through by stretching it. You just want it flexible so the pipe will pass through easily.

    Now put a small amount of silicon on the inside of the rubber flashing and spread it around so it will slip over the pipe without problem.

    Lower the flashing onto the pipe rotated 90 degrees or the opposite way that it came off.

    At the same time you want to lift the top two rows so that the metal flashing can be rotated under the middle row of shingles.

    BEFORE the flashing is pressed down to the surface of the roof you want to apply a bead of silicon on the shingles about an inch in from the edges.

    Now press the aluminum flashing flush to the shingle surface.

    Nail the bottom two corners about an inch in from each side the same position as when you took the flashing off.

    Nail the two middle edges of the flashing.

    Nail the top shingles in place through the flashing on the outside corners.

    Types Of Roof Flashing

    Guide to Roof Flashing Installation, Roof Flashing Repair ...

    Roof flashing is not a one-size-fits-all kind of material. For each type of roofing feature, there is a different type of roof flashing. And its imperative to install the right one in the right place, or you may risk it failing and causing severe water damage. So here are different types of flashing and their purpose.

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    Environmental Protection And Safety

    The process of installing a wood stove chimney through the roof is very safe and environmentally friendly. The installation does not require any power tools, making it great for home owners who live off-grid or in ecofriendly neighborhoods where gas powered devices are frowned upon such as condos and HOAs. Furthermore, putting up the piping only requires some basic carpentry skills using only a few common tools and minimal materials.

    Materials you need to install the chimney:

    • A drill with a ¼ inch bit.
    • Saw to cut the plywood for your chimney collar. Make sure its deep enough so that you can screw in two pieces of wood on each side, creating a tight fit around the pipe when installed through the roof. Cut at least ½ inches deep and large enough to accommodate the thickness of your chimney pipe.
    • Screws for attaching a collar around the piping, and weatherproofing sealant such as caulk or clay used in roof repairs.
    • A stud finder .
    • Wood shims
    • A ladder thats tall enough to get on top of your house.

    One: Loosen The Shingles

    Once youre up on the roof, the first thing youll want to do is loosen the shingles. Take a pry bar and pry back the shingles that are above and on the sides of where youre installing the flashing. Theres no need to do this to the shingles that are at the bottom of the vent pipe.

    If you dont have a pry bar or are short on space, a putty knife will work perfectly fine. Slip it under the bottom of each shingle and break the seal.

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    Sealing Around Stovepipe With Insulation Foam

    Sealing around the stovepipe with insulation foam is a crucial step. The last thing you want is for air to flow through your walls and out of the chimney, which will lead to poor drafting . A quick search on Google Images shows how much damage can be done by drafts! Check out this picture:

    How to seal around stovepipe with insulation foam:

    • Make sure youre working on a clean surface and that the chimney is located in an area of your house where its not too cold or hot. You dont want all that work to get undone!
    • Cut pieces of fiberglass insulation into small strips that will fill the space between your chimney and roof.
    • Use a caulk gun to apply insulation foam around any gaps you may find, such as where two sections of stovepipe meet or join onto another pipe. Allow 24 hours for it to dry before continuing with other steps in this project. Once fully dried, there should be no gaps between the insulation foam and your chimney or roof, which will prevent air from escaping.

    How To Install A Roof Plumbing Vent Flashing Boot

    Plumbing roof vent install on existing roof

    Installing a roof plumbing vent is typically an easier task than flashing a chimney. Here is how you do it:

    • Step One: Install shingles as normal up to the base of the plumbing vent.
    • Step Two: Place the flashing or boot onto the plumbing vent, so the base is resting on shingles. Momentarily lift the boot and apply sealant to hold the flashing in place.
    • Step Three: Firmly push the flashing back down into place.
    • Step Four: Install the next course of shingles. When you reach the plumbing vent, allow the shingles to overlap the top of the flashing.
    • Step Five: To make room for the vent itself, cut out a circular piece of the shingles, as shown below.
    • Step Six: To secure the circular edge of the shingle, apply roofing cement beneath it. Ensure you also nail it where you normally would.

    Do you need information about how to install the other kinds of roof flashing? IKO has already explained how to install drip edge flashing and how to install metal valley flashing.

    Old roof plumbing vent flashing boot

    New roof plumbing vent flashing boot

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    How Do I Install My Stove Pipe Kit

    The installation process will vary based on your chimney height and spacing from combustibles. For a complete guide, please refer to our Fireplace Chimney Installation Guide for more information. If you need further assistance, we recommend consulting with a professional contractor or contacting us directly via phone or email.

    How Do You Flash Around A Vent Pipe

    The process of flashing around a vent pipe is easy if you follow the instructions. Go through the steps below to complete the task:

  • Remove Old Shingles and Clean Pipes
  • Remove the shingles from your flashing carefully. Ensure that you clean the pipes outer surface to remove the old caulk.

  • Install Underlayment
  • Here you should use water and ice shields around the penetrations. It has a rubbery substance that wraps around the nails, thus preventing water from getting through.

  • Install Roof Cement
  • Apply a line of roof cement at the aluminum base. It assists in preventing water from entering the sides.

  • Pipe Flashing
  • After placing the flashing on your pipe, ensure that the pipe doesnt move and pull the rubber gasket out of position. Nail the flashings in areas that cant be touched by water easily.

  • Shingles
  • Cut your shingles to leave ½-inch around the base. You should leave the flashings bottom exposed and cover only the top and sides with shingles. If you notice a split in the shingle, proceed to caulk the flashings edge.

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    Roof Leak Repair Costs

    Since flashing helps to stop leaks before they start, I wanted to go over what it can cost to repair a leaky roof. It tends to be anywhere between $10 to $120 for a simple fix. Because this is such a wide range, Ive included a cost comparison chart to narrow down what you can expect to pay.

    Task at hand

    Safety Warnings And Considerations


    First and foremost, you need to know that installing the furnace vent comes with multiple safety challenges, including the following

    • Risk of personal injury and property damages: Improper installations, adjustments, alternations, servicing, and maintenance of the furnace venting system can cause an explosion, fire, CO poisoning, electrical shock, and other conditions that can cause personal injury or property damage.
    • Appliance damage or failure: Failure to follow proper installation protocols can also result in unit component damage.

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    Top Five Ways To Stop A Leak From Your Vent Pipe

    Some of these options listed below address just the rubber gasket and others address the whole flashing system.

    1. The Rubber Ring Gasket

    If you are looking for possibly the least expensive repair, sliding a new rubber ring over your existing pipe flashing will do the trick. Install caulk around the old rubber gasket before putting the new rubber gasket on. The problem here is that if you have misdiagnosed the leak and it is actually coming from the flashing kit or the shingles, then the rubber gasket wont stop anything.

    2. Pipe Sleeve

    The pipe sleeve works in similar fashion to the rubber gasket ring. It solely addresses the top rubber of the flashing and does not address anything related to the base of the flashing or the shingles around it.

    3. Standard Flashing With Extra Gasket

    Replacing the whole flashing kit is definitely the best way to fix a pipe leak. Make sure you go with an aluminum base not plastic. Install a second rubber gasket over top of the new flashing. This way, you get double the protection on your flashing kit. This is the most affordable option that will also maintain integrity for the duration of the life of the shingles.

    4. The Ultimate Pipe Collar

    Typically the most expensive remedy, This comes with a larger pipe collar flashing that has a custom sized rubber gasket. Everything about this product is bigger and stronger. It requires specific measurements for the pipe and a slightly more labor intensive installation.

    5. Shingles and Underlayment


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