203 858 0080 naas@mac.com

Flat Roof Repair - How to Repair a Leaky Rubber Roof Membrane - DIY Guide

This website is meant to help you get familiar with "Flat Roof Repairs"

How to repair a flat roof.

 “How to locate a flat roof leak” for Repairing Flat Roofing

Flat Roof Repair – How to Fix a Leaky Roof – This DIY Guide covers the repairing of EPDM Rubber, TPO Vinyl, and Modified Bitumen Torch Down Roofing. This includes:

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DIY Flat Roof Repair Checklist

  • Step 1Determine what type     roofing materials – is it an EPDM, TPO, Tar, and Gravel or a Torch Down?
  • Step 2Find out how old the roof isEPDM, TPO do not last much longer than 15 years. Torch Down can continue indefinitely
  • Step 3 – Look for apparent problems around vents, drains and other objects
  • Step 4 – Check the pitch pockets, flashing, cracked skylights, storm damage, holes made by flying debris from a storm
  • Step 5 – Clean or wash the roof to expose issues easier
  • Step 6Clean out drains and gutters regularly
  • Step 7 –  Apply compatible sealant where holes, cracks are visible causing leaks
  • Step 8 – Replace broken skylights and vent boots
  • Step 9 – Find an experienced roofer – not a handyman, to make the necessary repairs

This Video is about “How to Repair a Flat Roof” that has a Torch Down Rubber membrane. Follow the links to see how to make flat roof repairs on different roofing materials.

This video shows how a pitch pocket could cause a leak in a flat roof.

It is not always easy to locate what causes a leak on a flat roof. From experience, we know flashing against brick walls, chimneys are very susceptible causing leaks. Pitch Pockets on commercial roofs are know for causing leaks. Watch the video to see how to look for a leak and then what you are supposed to do to fix a flat roof leak.

DIY Flat Roof Repair support is available in all states:

  • Connecticut
  • New York
  • Rhode Island
  • Pennsylvania
  • Texas
  • Massachusetts

How to “Repair a Flat Roof Guide” – Follow the Instructions and make a list of things to do

Flat Roof Repair can be as easy as using s little caulk or tar. Finding the leak can be a problem. Look for the obvious. Things that can be obvious are places like flashing, vent pipes, drains, skylights. It should be relatively easy to spot a problem if there is a leak.

When it comes to seams, then it is harder to find a leak in the roof. This takes an experienced eye to detect a leak.

Locating the leak on your flat roof to look where a possible leak in the flat roof can be:

Flat Roof Repair is easy to perform. Once you have located the problem area. To make a flat roof repair, very few tools are required and the cost of repairing is minimal.

1. Skylights on flat roofs

Making Skylight Repairs on a flat roof can be tricky. Here are a few tips where you can begin.  Check the following on a skylight:

  • Skylight flashing – make sure that the rubber membrane has not come loose from the metal flashing. In some cases, the rubber membrane is the flashing as well and is tucked underneath the skylight frame. In other circumstances, the membrane is attached to the skylight flashing. Pull up on the membrane and see if you can lift it from the flashing. It should be tight and secure
  • Skylight Dome and Frame – when the glass or plexiglass dome of the skylight is secured with a metal frame, then it is likely that the rubber gasket that seals between the glass and the frame has dried and cracked

This 3 D video shows where an EPDM Rubber Membrane can leak

  • Corners on skylights – In many cases where the rubber membrane is galvanized around the corners of the skylight, can cause leaks due to the seams separation
  • Cracked Plexiglass – The plastic or plexiglass domes on skylights crack due to ultralight exposure
Cracked Plexiglass skylight causing a leak on a flat roof

Cracked Plexiglass skylight on a flat roof causing a leak

Plexiglass on skylight can crack Flat Roof Repair - CT, NY, PA, TX

The image above is a Round Domed Skylight made by Wasco

2. Bathroom Vent pipes – Flat roof repairs

Vent pipes piercing through a rubber membrane can become the cause of a flat roof leak. The rubber gasket or “roof boot” deteriorates over time and crack causing the leak.

  • Check the “roof boot” around the vent pipe
  • Check the rubber membrane and seams that attaches to the metal flange of the “roof boot”
  • Sometimes the “tar” that is used to seal the  pipe to the rubber, gets dry and crack, causing the leak
Flat Roof repair vent Boot -CT, PA, TX. CA, Vent pipe on flat roof repair - Greenwich CT and Latrobe PA

Bathroom Vent pipe with a Roof Boot – To make a flat roof Repair, you need to identify the leak areas. The vent pipes are prone to leak.

3. Pitch-Pockets on flat roofs causes leaks

A Pitch-Pocket is a bottomless container that is placed on a flat roof where airconditioner pipelines and wires are fed through. After the wires and pipes are fed through, the container is filled with liquid “tar” or roof cement to seal around the wires and pipes.

  • Check the pitch-pocket:  and see if it is full to the brim with tar. Many times this tar will dry and shrink and cause a low spot in the container. When it rains, this low spot will collect water, and water will eventually leak through where the wires and pipelines are.
  • Check the foam insulation that covers the pipelines. This foam deteriorates and causes openings where water can leak through the Pitch-Pocket.
  • Fill the Pitch-Pockets with tar – As a precautionary step, these pitch-pockets should be filled to the brim at least once a year.
  • Always check the Pitch-Pockets – When looking for a leak on a flat roof, always check the pitch pockets to see if the tar in them is filled to the brim.
  • Flat Roof Repairs can easily relate to a Pitch-Pocket that has wires and pipes going through it, and all you need to do is make sure the insulation foam around the pipes is not the cause of the leak.
An Example of a Pitch-Pocket -Flat Roof Fixing a Pitch-Pocket on a flat roof. Make sure it is filled with tar to the brim

An Example of a Pitch pocket with Tar. Notice the foam insulation around the pipes is all torn. This cause leaks on flat roofs

4. Flashing on flat roofs causing leaks

Flashing is probably the biggest cause of flat roof leaks. Many roof technicians will not take their time and make a proper flashing transition from a rubber membrane to flashing. This can be attributed to lack of experience or did not charge enough for the job.

Locating flat roof leaks – This video points out how counter flashing, if not done right, can cause a leak. 

  • Counter flashing – whenever flashing is used where a roof meets a wall, there must be proper counter flashing. Counter flashing is when siding or stucco or any other methods are used to cover the flashing from the top side. One should never be able to see the edge of a flashing.The vertical section should be covered by stucco, wood siding, or even other metal. The horizontal part that lies flat on the roof, should be covered by the rubber membrane.
  • Test the rubber adhesion on the metal – try to pull the rubber membrane away from the metal, if it comes up easily, then that could be the cause of the leak.
  • Check for cracked stucco or siding – If the siding or stucco has cracks in it, then the counter flashing is compromised.
Fixing a Flat Roof Installing Counter flashing - This is where a lo0t of flat roof leaks starts - Flashing is a very important part of a flat roof

Installing Counter Flashing – To fix the roof leak on this flat roof we had to install counter flashing. We used an angle grinder to cut a slot into the wall where the metal flashing can be inserted.

Flat Roof Repair – Installing Counter Flashing

The brick wall in the image shows that the membrane was brought up the wall about 12 ” high. They then adhere the roofing membrane to the wall. This way of making flashing doesn’t work. The membrane will eventually pull away from the wall. We cut a slot into the brick wall at a 30 degrees angle.

After the slot was cut, we inserted a metal counter flashing that hang over the membrane. This is what counter flashing is and how it is done.

Flat Roof Repairs mostly involves flashing on flat roofs that were not done correctly.

Flat roof repair - after installing cutting the grove in the brick wall, the counter flashing is installed

Counter Flashing Installed – After cutting the slot into the brick wall, a metal flashing was inserted into the slot and that went over the membrane to cause the flashing.

5. Chimneys – the Cause of Flat Roof Leaks

The counter flashing on chimneys is always a problem on chimneys. Many times, the counter flashing has to be embedded in the stone or brick wall. This is where most people don’t get it right.

  • Check if the sealant that is used on the counter flashing still holds
  • Check if the counter flashing is still intact
  • Check for cracks in the chimney
  • Inspect the chimney crown – This is the topmost part of the chimney – Most of the time, these cement slabs crack and causes leaks.
  • Make sure the rubber membrane is properly attached to the flashing on the chimney.

In the image, notice where the metal flashing meets the cement grout. That little crack is where water leaks from on a flat roof

How to Fix a Flat Roof - Flashing on chimney is leaking. Seal the flashing where it meets the cement

Chimney flashing causing leaks – to be able to fix flat roof leaks, you need to identify what causes the leaks. See the flashing in this image

7. Drains – Flat roof repairs around drains

When a drain is leaking, it is not always necessarily what causes the leaking. Because the drain is normally lower than the rest of the roof, a leak could start somewhere else and flow towards the drain underneath the roof membrane.

To locate a leak around a drain area do the following:
  • Try to open the ceiling where the drain is coming through the roof and make a visual inspection
  • Clean all debris that has accumulated around the drain and strainer
  • Remove the strainer to make a visual inspection of the drain pipe from above
  • Make a close-up inspection of the roofing membrane and the drain flange to see if it hasn’t separated
  • If you cant find an obvious problem, call an experienced roofing technician to find and repair the leak
Flat Roof repair - Membrane is not attached to drain and caused leaks

Flat Roof Repair – The rubber membrane was never attached to the drain flashing in this image

8. Dripedge – Locating the roof leak at the perimeter of the roof on the drip edges

Drip edges are made of metal and make the transition from the roofing membrane to the gutter or edge of the roof

Things to inspect to see if the drip edges are causing roof leaks:

  • Inspect to see if the membrane is still attached to the metal edging on the perimeter of the roof
  • Check where two drip edges overlap for a potential gap or crack on the roof
  • Make sure the drip edges are still properly attached to the substrate
  • If gutters are present, make sure the drip edges are pointing into the gutter and not behind the gutter
Lose membrane form drip edge on Flat Roof causes leaks

A rubber membrane should be attached to a drip edge. In this case, the adhesives have failed and the rubber membrane was lying loose on the drip edge

Flat Roof Repairs and Installation Team

Roofing contractors over 25 years – We fix what other roofers mess up!!

Naas Ferreira - Flat Roof Repair Expert in PA, CT, TX, CA, NY - We repair all flat roof membranes

Naas Ferreira

Roofing Contractor for over 25 years – Flat Roof Repairs

Erik Ferreira -Fixes Flat Roofs in Pennsylvania, Texas, Connecticut, California, New York

Erik Ferreira

Owner – Estimator – Job Coordinator – 12 years -for flat roof repair

Andre Ferreira- How to Repair Flat Roofs Expert - We service all of New England, Pennsylvania and Texas

Andre Ferreira

Manager – Estimator – Roof Assessor – 14 years

Sven Ferreira - Fixing, mending and making flat roof repairs for 15 yeras

Sven Ferreira

Project Manager – Coordinator – 8 years

Below are links to the different types of roofing membranes that you might have and want to repair yourself.

Flat Roof Drains

Always make sure you have a large metal drain strainer for a flat roof repair
It is important to have a correct draining system on a flat roof to avoid structural damage. Drains must be sized correctly and placed in the right location to be effective. Main Page: Drains, Scuppers, Gutters Other Articles:

Rubber Membrane Repair Torch Down – DIY Videos

Flat Roof Repair - Pennsylvania, New York, Connecticut, Texas, California
  1. Main Page: Torch Down Rubber Membrane Repair
  2. Other Articles:
  • Materials and Tools list  with instructions to fix a Torch Down Rubber Roof
  • What to look for before making roof repairs
  • Comparing Torch Downs with other Roof systems
  • Aluminum ...
    More Flat Roof Repairs

TPO Vinyl Membrane Repair

TPO Tools for Flat Roof Repair in Connecticut, Pennsylvania, Texas, California
Articles/ Videos about TPO Membrane:
  1. Main Page: How to repair a TPO membrane
  2. Other Articles:
  • TPO and PVC Roofing - Single Ply Roofing System
  • Advantages and Disadvantages of a TPO roof
  • TPO Roofing membrane
  • Fixing a TPO ...
    More Flat Roof Repairs

EPDM Rubber Roof Repair

EPDM Tools for a Flat Roof repair - CT, PA, NY, CA, TX, CA
Articles/ Videos about EPDM Rubber:
  1. Main Page: DIY  EPDM Rubber Roof Repair instructions
  2. Other Articles:
  • Comparing EPDM Rubber with Torch Down
  • Explaining three types of Rubber membranes
  • Ultra Violet Degradation of EPDM Rubber
  • EPDM Rubber Roof Issues
  • ...
    More Flat Roof Repairs

How to Determine the Type of Flat Roof Membrane to make roof repairs

Tools to repair rubber membranes
Always make sure you use the right roofing materials for flat roof repairs First Step:  Determine the Type of Flat Roof Membrane There are basically three types of roof membranes used:
  1. EPDM Rubber Membrane - you can tell it by the ...
    More Flat Roof Repairs

Flat Roof Repair – How to Fix a Leaky Flat Roof – DIY Guide – Videos

Demonstration on how to do Torch Down Rubber Membrane on a flat roof
How to repair a flat roof.  "How to locate a flat roof leak" for Repairing Flat Roofing Flat Roof Repair - How to Fix a Leaky Roof - This DIY Guide covers the repairing of EPDM Rubber, TPO Vinyl, and ...
More Flat Roof Repairs

We have been fixing flat roofs for over thirty years in these towns of Fairfield County.

We serve Connecticut :

  • Greenwich
  • Stamford
  • Darien
  • Norwalk
  • Westport
  • Fairfield
  • New Canaan
  • Ridgefield
  • Weston

We have a base in Pennsylvania where we have been installing and Repairing Flat Roofs.

We serve Pennsylvania in the following towns:

  • Latrobe
  • Greensburg
  • Jeanette
  • Monroe
  • Pittsburgh
  • Harrisburg
  • Altoona

We have a base in Texas where we have been installing and repairing flat roofs for the last twenty years.

We serve the North East Texas corner in the following towns:

  • Longview
  • Tyler
  • White Oak
  • Kilgore
  • Marshall
  • Gilmer
  • Jefferson

Determine the type of flat roof you have

Torch Down Rubber Membrane 

This is what a Torch Down Rubber Membrane looks like. The membrane come in three foot wide rolls and the seams are fused together with a torch.

When making flat roof repairs on a Torch Down Roof, you can use any petroleum product as in tar, butyl caulk. This roof in the image has a white granular embedded on the surface to protect it from ultraviolet rays.

Many times a plain torch down membrane is installed with no granular, then a silver coating must be applied to protect it.

How to Fix a flat roof - This is a roof in CT, PA, TX, NY, CA, Westport - It is a Torch Down Rubber membrane over Tar and Gravel

Torch Down Rubber Membrane – Fixing flat roofs and making repairs Westport, CT

EPDM Rubber Roof Membrane

This is what an EPDM Rubber Roof Membrane looks like. It is black, and have a smooth surface. The seams can be from ten feet to twenty feet apart.  When you need to make flat roof repairs on an EPDM rubber membrane, the first thing to check is the seams. The adhesives that are used to bond the seams together, prematurely fail, due to the extreme heat and ultraviolet.

The adhesives that are used to bond the seams together, prematurely fail, due to the extreme heat and ultraviolet. EPDM rubber roofs generally don’t last more than 8 years without severe issues and repairs.

How to repair a flat roof Greenwich CT Pittsburgh PA Longview TX - PA Roofers shows you How to make repairs on your flat roof

EPDM Rubber Roof Membrane – Repairing, patching and making EPDM Rubber flat roof repairs

TPO Roof Membrane

This image shows what a TPO Roof Membrane looks like. These roofs are generally good and will last up to 20 years. It is a better roof than that of an EPDM Rubber membrane but it is still susceptible to ultraviolet rays. In the video above I showed how the TPO Roof is at its end due to ultraviolet degradation.

How to fix a Flat Roof TPO Roofing Stamford CT, Greensburg PA, Kilgore TX, Los Angeles CA - this is a TPO Roof that started to leak

TPO Roof Membrane – Mending and fixing flat roofs is what we do. Patching TPO membranes

Erik Ferreira - Roofing Contractor in Norwalk, Stamford and greenwich

Erik Ferreira – Commercial Roofing Contractor – Flat Roof Repairs

Erik is my oldest son (roofing contractor) and is 27 years old. He has been in Flat Roof Repairs before he left school during vacations. He has decided to take the business further and keeping it in the family. With all the roofing experience and knowledge passed down, you can be assured to get the best service and product.

Fix, Patch or the Repair of Flat Roofs

We are Roofing Contractors for the Installation and Repairs of flat Roofs. With our experience of over 30 years, we can troubleshoot and repair any roof leak. Commercial and residential roofs are all the same. Most roofs can be repaired even if they were badly installed. We service Westchester County and Fairfield County.

Free Estimate call:

203 858-0080

Andre Ferreira - Roofing Contractor in Stamford, New Canaan and Westport

Andre Ferreira – Commercial Roofing Contractor

Andre is the second oldest son (roofing contractor) and is 25 years old. He started when he was 16. He has always been hands on all aspects of roofing. When it comes to troubleshooting a leak, he is the one that beats everyone. Now that my sons are running the business, you can be assured of receiving quality service and knowledge that is passed down.


  1. I have used Flat Roof Doctor for all my flat roof repairs and they have been very good.
    The repairs damages on my flat roof were extensive due to Hurricane Sandy. I had several trees fall on my roof and the rubber membrane was pierced in many places.
    Flat Roof doctor came to my rescue very fast and it took several days to make the necessary roofing repairs.

    • Thanks Corneliu
      You have been a great customer to work with. I hope all the roof repairs are at an end now.
      When we got a call from Corneliu, we knew he had suffered major damaged to his roof. We gathered our roofing teams together and rushed to get his flat roof closed up before the next rain.

      Hurricane Sandy damaged many roofs in Westport, New Canaan, Wilton, Ridgefield, and Greenwich areas.

      Because most houses are surrounded by tall oak trees, the chances are high that a strong wind could blow some of the trees over or even brake limbs off and blow them on any roof nearby.

    • Hi Corneliu
      I am happy your roof is in good shape.We have been fixing flat roofs for over 30 years

  2. Flat Roof Doctor is been a great help for me.
    It let me do my own repair without spend a fortune.
    Thank you guys!!!!

    • I am glad you could do your own flat roof fix. Being able to do it yourself is a wonderful accomplishment

  3. It has been a great advantage to be able to have help from a professional. Your videos have been a great help to me and I would recommend you for any project.

    • Thanks Abel
      I am glad I could help you. I hope the repairs on your roof are holding up.

  4. I have a flat roof that has been leaking for a few months now. I have had several roofers try to come and fi the flat roof. No one so far could find the leak.
    What do I do now to get this leak fixed on my flat roof?

    • Hi Shawn
      I am sorry about your issue with your flat roof. After reviewing the images you have sent to me via text message, I could tell that the leak was not coming from the flat roof. What appears to me from the image is that the siding on the one wall has many cracks. These cracks will bring water in behind the siding and behind the flashing on the flat roof.
      I suggest you repair the siding boards that are cracked and paint the entire wall and I am pretty sure the leaks on your flat roof will come to an end.

  5. Flat roof doctor did my roof more than 10 years ago and it looks impeccable. Now he is doing my friend’s roof, he is a professional and I highly recommend him!

    • Hi Rosy
      Thanks for the kind words. I hope for another 10 years of carefree maintenance

  6. I need to repair my flat roof. I have a Torch Down Roof. Can I use Alsan Waterproofing Polyurethane Flashing liquid to make the necessary repairs? I don’t want to buy a torch and a big roll of Modified Bitumen Membrane to make a small repair. So, I was hoping to be able to use this flashing liquid. Can you please advise.

    • Hi James
      The answer is yes. I have used this product many times and it is great. A little expensive but very easy to use to make a flat roof repair.
      Here are the steps to follow if you are going to buy this product and make flat roof repairs:

      1. Make sure there is no Aluminum Paint in the area where you will apply this liquid
      2. If possible, use a wire brush to brush the surface as to remove the oxidation on the surface
      3. Make sure the surface is completely dry before making the repair
      4. Do not apply this material below 45 degrees F.
      5. Brush Alsan Flashing Liquid liberally on the surfaces covering the crack or leaky area. Make sure you go at least 5″ on each side of the crack or hole
      6. Cut the fiberglass fleece to the size of what the liquid was painted on
      7. Press the fleece into this painted surface with your brush and get all the bubbles out
      8. Apply another coat of Alson Flashing over the fleece
      9. Wait 24 hours and do a final coat of this Alson Flashing

      I hope this helps you to make a perfect Flat Roof Repair. Good luck

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  8. Where can a person purchase the wide membrane as shown on your video? I’m unable to find a site that sells it. What I have seen are only 4″-6″ wide.
    Thank you, C Burke.

  9. I enjoyed the video forward to my friend who is selling her house and was looking for help. You made it look very easy and showed the steps on how to use the products. I think this is great help for people who need some roof work done. Thanks

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