How A Professional Roofer Can Install Flashing On Your Roof


Roof flashing protects the edges and joints of the roof from water damage, leaks, and mold. Flashing is usually made of metal, plastic, or rubber, and it covers the areas where the roof meets the walls, chimneys, skylights, vents, or other structures. There are several things a contractor must do to install the flashing correctly.

Choosing the Right Type and Material 

Different types and flashing materials are available in the market, each with advantages and disadvantages. The type and material of flashing you choose will depend on several factors, such as:

  • The shape and slope of your roof
  • The climate and weather conditions in your area
  • The design and style of your house

Types of Flashing

Step Flashing

This series of rectangular pieces of metal is bent and installed along the roof's edges, where it meets a vertical wall. Step flashing is ideal for roofs with shingles, tiles, or slate.

Continuous Flashing

This long strip of metal runs along the entire roof length, where it meets a vertical wall. Continuous flashing is ideal for roofs with metal panels or flat roofing materials, providing a smooth and seamless transition.

Counter Flashing

This piece of metal is attached to the wall above the step or continuous flashing, creating a double layer of protection. Counter flashing prevents water from seeping behind the lower flashing and into the wall.

Valley Flashing

This is a piece of metal installed in the valleys or intersections of two sloping sections of the roof. Valley flashing channels water down the valley and off the roof, preventing leaks and pooling.

Vent Pipe Flashing 

This is a piece of metal fitted around a vent pipe or any other protrusion on the roof, such as a chimney or skylight. Vent pipe flashing seals the gap between the pipe and the roof.

Flashing Materials


This lightweight and inexpensive material is easy to work with and corrosion-resistant. However, aluminum can dent easily and may not be compatible with some roofing materials, such as copper or steel.


This durable and attractive material develops a natural patina over time. However, copper is expensive and requires special tools and skills to install. 

Galvanized Steel

This strong and economical material coated with zinc prevents rusting. However, if exposed to moisture or salt water, galvanized steel can rust over time. 


This is a synthetic material that is waterproof and flexible. However, rubber can degrade over time due to exposure to sunlight, heat, or chemicals. Rubber can also be damaged by sharp objects or animals.

Cutting and Installing the Flashing

Before installing your flashing, the roofing contractor must measure and cut it accurately to fit your roof. Then, they can install the flashing using nails, screws, caulk, or roofing cement to do this task so your flashing will be held in place and do its job. 

Contact a local roofing company, such as JCB Roofing, to learn more. 


11 July 2023

Roofing Fundamentals: What To Know Before Replacement

When it came time to install a new roof on my home, I had no idea where to start. In fact, I was exploring roofing options that were a really poor fit in my climate. It wasn't until I reached out to a local roofer that I got some lessons on how to choose the right roofing material for my home and the weather exposure it is subjected to. I built this site to share my journey, including the mistakes I made and the things that I learned along the way. If you are considering replacing your home's roof, I hope that the information here can help to guide you through the process.