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Custom counterflashing on commercial TPO roof.

I’ve Never Heard of It. What is Counterflashing?


Counterflashing refers to the metal flashing that is installed over the top metal of base flashing. It prevents water infiltrating a building where two different construction materials meet.

“Thanks, I somehow know less now.” Don’t worry, we got you.

What is Base Flashing?


  • Base flashing, or just flashing, is a thin sheet of metal that is applied at the bottom of a vertical surface like a wall. Imagine where a chimney or dormer intersects with the rest of the roof.
  • Protects construction materials from exposure to water.
  • It is most commonly made of galvanized steel but can also be made of aluminum or coated copper.
  • Very important- we’re big fans.

What is Counterflashing?


Galvanized steel counterflashing on TPO roof.

  • Counterflashing is an additional piece of metal applied over the top edge of the base flashing.
  • Further directs water away from the vulnerable joint.
  • Provides a watertight seal to ensure integrity of the materials underneath.
  • Super important- we’re even bigger fans.

Why Does Proper Counterflashing Matter?


First, a properly sized and placed counterflashing can add years to the integrity of your roof by eliminating water exposure to vulnerable places. Luckily, Roof Experts makes all of its galvanized steel counterflashing in-house! We create each piece specifically for the task at hand, ensuring a custom, watertight fit that leaves you worry-free! Secondly, an improper fit or improper technique can lead to roof damage and more of your time and money to repair. Custom-made materials can add years to the vulnerable parts of your roof. Call Roof Experts, the true experts, for long-lasting solutions.

Roof Experts is here to repair or replace any commercial or residential roof you need. Contact us today and let us know what we can do for you!

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