Costly Flat Roof Leaks – 10 steps to Find and Repair Leaks DIY

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Can the Vent Pipes be leaking?

Costly Flat Roof Leaks - 10 steps to Find and Repair Leaks DIY 1
The Rubber Boot that makes the transition from the pipe to the flashing is missing

When you want to make a flat roof repair, then it is important that you get the right materials and tools for each different flat roof material. Using the wrong products can ruin the roof membrane and become more costly later on to repair it.

Flat Roof Doctor

Below are files that contain images showing how to use either Turbo Poly Seal or Super Silicone Seal to repair vent pipe leaks

Vent pipes are necessary to vent drains from bathrooms. These pipes penetrate the roof. When any object sticks through a roof, some kind of flashing is needed.

In most cases, bathroom vent pipes have a vent boot that makes the transition from the pipe to the roof. These roof boots are made out of EPDM Rubber and will deteriorate and get brittle over the years.

One way to repair these roof boots is to hire a roofing contractor to replace it.

Another method to fix this problem will be to use Turbo Poly Seal or Super Silicone Seal.

This is using Turbo Poly Seal to fix a vent pipe flashing

Both Super Silicone Seal and Turbo Poly Seal are excel very pliable and will outlast any EPDM Rubber material. They are also easy to use. Watch these videos on how it is done.

Using Super Silicone Seal to make repairs on Vent pipe leaks

Super Silicone Seal being used to make vent pipe flashing
Super Silicone Seal being used to make vent pipe flashing

Super Silicone Seal will last over 15 years with no issues. It adheres to wood, plastic, metal, glass, paint.

This is what it looks like after applying the Super Silicone Seal
This is what it looks like after applying the Super Silicone Seal

How to check Vent Pipes for leaks

  • Make a visual inspection to see if the rubber boot is still intact
  • If any caulking was used making temporary repairs
  • Take a close look to see if the seal around the pipe is very tight. There should be no gaps
  • Make sure the roof membrane is attached to the metal flashing of the vent pipe

How to repair a leaking vent pipe on a metal roof

Metal roof vent pipes can be hard to repair due to the standing seams. Watch this video to see how easy it is to make repairs

Vent Pipe Repair on a metal roof

How to Repair a leaky Vent Pipe

  • Clean the pipe and roof area so it is free from debris
  • Tape a square area off with masking tape approximately 10″ from the pipe
  • Take a disposable brush and paint 1 coat of Super silicone Seal inside the taped off area and also up the pipe
  • Cut tabs in a polyester fleece and install it into the wet painted surface covering the pipe and roof at the same time
  • Paint a final coat over the fleece
  • Remove the masking tape
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