Chimney Flashing

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Why Your Chimney Needs Roof Flashing

The #1 reason your chimney needs roof flashing repair to stop leaks before they start! Leaks in a home are the biggest complaint among homeowners, and water entry into fireplaces are absolutely the most common signs of a leaking chimney.

Water damage from your flashing leaking will lead to other critical problems such as:

  • ceiling stains
  • mold
  • roof damage

By keeping your chimney roof flashing in good repair, you can prevent a water damage now, and costly home repairs later.

Know the Different Types of Metal Chimney Flashing

How does installing chimney flashing help you protect your home from water damage?

First, let’s cover how flashing and roof crickets are built.  Different companies may use various methods of construction or use different types of roof flashing materials to build your system. Long ago sweeps used types of lead flashing materials. We’ve also seen copper chimney flashing materials used but at Full Service Chimney we primarily use Stainless Steel or Galvanized Steel to construct our roof protection systems. 

How it’s Made

Chimney and roof flashing is made of carefully cut and shaped sheet metal that is installed in the mortar joints of the chimney and between the shingles of the surrounding roof. Consider how caulking and weatherstripping help seal your home’s windows airtight.

Flashing performs a similar job to water seal the union point where your chimney meets the roof. When constructed and installed correctly flashing is long-lasting.

Can Bad Chimney Flashing Cause Leaks?

Yes. You must understand, damaged or missing flashing causes more leaks into homes than all other chimneys/roofing issues combined.

You need a water barrier between the roof itself and your brickwork. When installed properly, brick chimney flashing will prevent leaks. 

Without sturdy flashing, water can enter your roof and attic, causing chimney leaks. When a chimney is built into your home, it must come through an opening in your roof.  If the chimney is not built to keep the water out, then it will use the same opening to allow water inside the home. Delay in repairs must be avoided. 

3 Types of Roof Flashing to Prevent Water Entry

There are three different types of flashing for roofs that need installed on your chimney to keep water out. Each is described in more detail below. 

The 3 Roof Flashing Types are: 

  1. Step Flashing
  2. Counter flashing
  3. Roof Cricket 

Step Flashing diverts water from the roof away from the chimney.

Counter Flashing around a chimney prevents water from leaking into the home.

The added Cricket Installation stops water from ponding on your roof. See more details for each type of flashing below.

Step Flashing Installation in Progress

Step Flashing in Progress

Complete Step and Counter Flashing System with Cricket

Step and Counter Flashing

Step and Counter Flashing with Cricket

Step and Counter Flashing with Cricket

Find out what’s wrong with your chimney with the Chimney Detective Tool!

How to Do Flashing Around a Chimney 

1. Step Flashing

As the name implies, the step flashing goes between the rows of shingles in steps. Each piece is bent to a 90-degree angle, allowing it to rest on a shingle and sit against the chimney’s brickwork. Because roofing around the chimney is made up of many rows, each row of shingles must have its own piece of step flashing.

Step flashing ensures any water that flows past a shingle and then to the chimney is carried to the next roofing row and flows finally off the roof. When the step flashing is too short or nailed incorrectly, water gets through and leaks into the attic.

To properly install flashing on your chimney, we must first remove the shingles that border the brickwork.

Then, we’ll replace the step flashing, starting at the lowest point of the roof, weaving together shingles and the flashing in the proper order.


2. Counter Flashing

Counter Flashing is installed after the step flashing. It has the job of directing rainwater that drains down the chimney’s brickwork onto the roof and away from inside your home.

The trick to making counter flashing watertight is found in how it’s made and installed. Built with a 90-degree tab inserted into a cut mortar joint and sealed in place, counter flashing installed in this fashion not only is watertight, it is very secure against the elements for many years.


3. Chimney Cricket

It’s rare for a chimney to come through a roof’s peak, so there is an opportunity for water to accumulate on the uphill side. When water ponds on your rooftop, even temporarily, it will leak. It’s only a matter of time because shingles will always leak if water persists on them for too long.

Standing water on roofs must be avoided! Chimneys without the added component called a cricket (or saddle) always form a small pond of water when it rains. Crickets incorporate counter and step flashing in their design, but they solve water ponding problems by dividing the water uphill into two halves, directing the rainfall to either side of the chimney. If your chimney has a waterproof cricket, your home will avoid most chimney leaks.

A home’s roof must drain the rainwater that falls on them. If they don’t, the weight of heavy rainwater can cause the roof to collapse. Roofs are pitched or slanted to encourage draining water for this reason. If there is a chimney chase coming through our pitched roof, it becomes an obstacle to easy water flow! For this reason, the installation of chimney cricket flashing is a frequent repair.

A Chimney’s Cricket is a specialty type of flashing for chimneys. It will divert the water flow on the roof, so rain is forced around your chimney, rather than against it. Ultimately preventing leaks!

Missing or leaky chimney crickets are so common that the IRC building code requires chimney crickets to be installed on all chimneys 30” or wider. If you’re experiencing leaks around your chimney, especially on the high roof side of your chimney, a cricket may be what you need.

Trust Your Local Chimney Experts

Our Certified Repair Technicians can install new or replace worn out flashing to fix your leaky chimney problems. Your leak protection systems are fully tested before every project is complete.

Servicing homes across Kansas City for over 3 decades! We can help you too!

New Flashing Installation in Kansas City

Common Problems that Lead to Chimney Flashing Repairs

1. Water Leaks Into Chimneys That Don’t Have Proper Barriers Installed

Proper Chimney Flashing serves as the only water barrier between the roof and your brickwork to help prevent leaks. Without sturdy flashing, water enters the roof and attic causing chimney leaks.

Avoid this problem with professional waterproofing, a well-built chimney crown constructed properly. Our leak repairs are tested rigorously before completion.

2. Your Original Flashing is Old, Worn Out, or Damaged

Repairs and replacement must be performed once it’s compromised due to age or injury. If damage is allowed to remain, further leaks and damage to the structure and your home will result.

3. Missing Chimney Crickets Allow Water Inside a Home

Draining rainwater accumulates on the uphill side of your chimney, this area will cause the roof / chimney to start leaking. A “cricket” is a Metal Chimney Saddle that diverts cascading water to either side of your chimney. Protecting your roof from ponding water.

Repair or Replacement Options

Repair and replacement of the flashing on your chimney must be performed if the quality has been compromised due to age or injury. If existing damages are allowed to remain, then it causes water entry and more damage to both the chimney and home. Your chimney’s flashing is essential to keeping your home and hearth safe and dry. Think of it as the “weather-stripping” between your home and masonry or prefab chimney’s. It ensures water draining off the shingles of your roof flows around your chimney, rather than into the roof.

How Much Does it Cost to Fix Roof Flashing?

$1000+ is an average starting price of chimney flashing. New flashing, if installed at the time your chimney is rebuilt is figured into the job total. If Chimney Rebuilding isn’t needed, and only flashing repair or replacement is requested, then it typically costs more. Repair and replacement is a frequent chimney service for the trained technicians of Full Service Chimney. Many families enjoy the effects of our efforts to keep their Kansas City homes safe and dry.

What Happens If You Delay Repairs?

If your chimney has damaged or missing flashing, then it can cause thousands of dollars worth of water damage to your home in a matter of a few rains. 

Why? Because rainwater drains from the roof and chimney into the attic, onto ceilings, and into the chimney, where it will damage every surface it touches. The destruction that leaks cause are not limited to attics, walls, and ceilings.

Missing flashing is the cause of fireplace and chimney damage as well. Once water makes its way past the roofing, it can leak into the chimney chase and fireplace often ending up in the ash dump below the firebox. Leaks are often responsible for damages to interior brick, firebox, damper, and fireplace inserts.

The price of allowing leaks to continue without repair will end up costing you many times more than the initial cost to replace flashing.


black chimney flashing on brick chimney

Can You Add Sealer to Your Flashing?

Oh, yes! Chimney flashing sealant is a common DIY solution for leaking problems. Be warned though, patching is not enough to stop water entry.

When our sweeps are asked to seal a chimney’s flash system, we use the best sealant for a chimney flashing repair. A professional product called FlashSeal. It’s is a two-part chimney repair kit that uses a heavy fabric and elastomeric sealant to form a flexible waterproof repair. Flash Seal is a common repair that we can frequently provide the service on our very first visit to your home.

Proper construction and waterproofed brickwork, will prevent water entry, both now and in the future. A chimney with waterproofing and is free of cracks will stay strong and dry. 


What Our Customers Say

"We had our chimney removed and the team was fantastic! They were great to work with, communicated about everything, answered all our questions, etc. It was quieter than I expected and the team cleaned up everything everyday. I recommend them to all of our friends!!"


"Great experience from first appt with sales to installation guys. All are helpful, knowledgable and skilled. A good experience from the get go."


"Everyone was very professional and courteous even when there was a problem with the gas line connection in the fireplace. They stayed until the problem was fixed which delayed their next project. I am very pleased with the results and the professionalism of everyone who worked on the project. This was the second project at my home and was very pleased both times. I highly reco..."


"We had Full Chimney reline the chimney on our 35 year old house and put on a new crown. The initial inspector provided photographic evidence of need for repair. We were very satisfied with the quality of the work and the politeness of the two man crew, Jacob and Ian. Jacob, the lead tech, carefully explained all our questions and took pains to avoid disturbing plantings around the..."


"We hired Full Service Chimney to repair flu's in three fireplaces at our lake house that were built incorrectly and would never draw the smoke, hence for 5 years we rarely if ever used them. Now they all three work perfectly!! These guys are incredibly professional, reliable and they communicate effectively every step of th..."

John and Mary Campbell

Call the Flashing Repair Experts Near You

Full Service Chimney sweeps have repaired and replaced chimney systems in the Kansas City area for over 3 decades. Let us help solve your leak problems with a new installation or by fully replacing your flashing. Call us today!

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