What You Need To Know About Your Chimney Flashing

Chimney flashing is a crucial part of any roof that has a chimney. It provides a seal between the roofing material and the chimney to prevent water from seeping in and causing damage. There are several types of chimney flashing, each designed for specific circumstances or types of chimneys and roofs. Here are some common types of chimney flashing:

First, let’s understand the types of chimney flashing you will find on roofs.

1. Step Chimney Flashing:

This is the most common type of chimney flashing, especially for sloped roofs. It involves laying individual pieces of flashing in an ascending manner, such that each piece overlaps the one below it, resembling steps. This type of flashing is typically used in conjunction with other types like counter flashing.

2. Counter Flashing (Cap Flashing):

Workers install this piece of flashing into a groove in the chimney and then fold it down over the step flashing.The purpose of counter flashing is to add an extra layer of water protection and cover the step flashing.

3. Base Flashing:

Next, are base flashings. This is the bottom layer of the flashing system. It’s the first layer installed and directs water away from the base of the chimney.

4. Cricket Flashing (Saddle Flashing):

5. Through-wall Flashing:

Builders use this for chimneys that are an integral part of the wall of the house, with the flashing extending through the wall and across the chimney.

6. Apron Flashing:

Next, another part of the chimney is the apron. Workers install a single piece of material at the base of the chimney where it meets the roof. It’s called apron flashing because it resembles an apron, providing coverage for the area beneath the chimney.

7. Pan Flashing:

Used often in flat roof applications, pan flashing is a single piece of material that extends from the base of the chimney across the roof. It’s bent at the chimney base to provide water runoff.

8. Metal and Rubber Chimney Flashing:

While these aren’t technically types of flashing, individuals can use different materials for chimney flashing, each with its own strengths and weaknesses. Metal flashing (like aluminum, copper, or steel) is very common and highly durable, while rubber flashing can be easier to work with and may provide better waterproofing in certain circumstances.

Final Notes:

In conclusion, each of these types of flashing plays a role in protecting your home from water damage. The specific type and materials used may vary depending on the construction of your home, the climate where you live, and the specific configuration of your roof and chimney. A professional roofer or chimney specialist can help you determine the best option for your situation.