Flashing your Chimney

What is Chimney Flashing?

Chimney flashing is a crucial component of your roof system, designed to prevent water from seeping into your home through the joints where the chimney meets the roof. Proper flashing installation is essential to protect your home from water damage, mold, and potential structural issues.

Types of Chimney Flashing

There are two main types of chimney flashing and one repair solution:

  • Step Flashing: This type of flashing is used to cover the gaps between the chimney and the roof. It's typically made of metal and is installed in overlapping layers. This involves the lifting off of the old shingles and may involve replacement of those shingles.
  • Counter Flashing: Counter flashing is installed on top of the step flashing to create a watertight seal. It's usually made of metal and is often integrated with the chimney masonry or roofing material.
  • Flash Seal: FlashSeal is a versatile and easy-to-use flashing repair system that, when dry, forms a flexible, waterproof membrane. It’s formulated for permanent adhesion to asphalt shingles, metal flashings, brick, and other chimney and roofing materials. Use FlashSeal to solve problem leaks around the base of chimneys, stacks, and vents. It is also great for sealing around skylights.

Our Process May Include

  • Metal flashing (copper or galvanized steel)
  • Choices of Flashing Repair
  • New Step Flashing
  • Remove any old, damaged flashing.
  • Clean the surface of the chimney and roof to remove dirt, debris, and loose materials.
  • Cut pieces of flashing to fit the gaps between the chimney and the roof.
  • Apply roofing cement to the back of the flashing and press it into place.
  • Nail the flashing to the roof and chimney, ensuring it's securely fastened.
  • Overlap the layers of flashing, creating a watertight seal.

New Counter Flashing   

  • Cut pieces of counter flashing to fit over the top of the step flashing.
  • Apply roofing cement to the back of the counter flashing and press it into place.
  • Secure the counter flashing with nails or screws.
  • Caulk any gaps between the counter flashing and chimney or roof.

Flash Seal

Repairing flashings that have been tarred over, split, cracked, or are in disrepair is easy with FlashSeal. It’s like installing a custom-fit rubber boot at the base of the chimney! It remains permanently flexible and has a 7 year warranty when used with FlashSeal Reinforcement Fabric.

For complete chimney protection, we recommend waterproofing the chimney and sealing the chimney crown.

Professional Installation

Our professional installers will assure that your chimney flashing is installed correctly. They  will have the experience and expertise to properly assess your roof and chimney, and install the appropriate flashing to protect your home.

By taking the necessary steps to properly flash your chimney, you can protect your home from water damage and ensure it's longevity.

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