Chimney Flashing

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Common Flashing Problems

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

Your Chimney Flashing serves as the water barrier between the roof and the brickwork to help prevent leaks. Without sturdy flashing, water enters the roof and attic causing chimney leaks. A leaky chimney can be avoided with professional waterproofing, a well-built chimney crown constructed properly. Our leak repairs are tested rigorously before completion.

2. Original Flashing Gets Old or Damaged

Flashing Repair and replacement must be performed if it’s compromised due to age or injury. If damage is allowed to remain, chimney leaks and damage to structure and home will be the result. Full Service Chimney Service has provided Kansas City area homeowners chimney repair services and options for thirty years. We examine your chimney to find the cause of chimney leaks. Only then can your repairs stop water entry at the roof flashing.

3. Missing or Leaky Chimney Crickets Allow Water Inside the Home

Draining rain will accumulate on the uphill side of your chimney, this area is prone to roof and flashing leaks. A chimney cricket (or “Saddle”) will divert the water to either side of your chimney, protecting the roof from ponding water and the frequent damage found in this area. A Cricket is a special type of flashing, that diverts cascading water away from the chimney and keeps water from building up.

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

Why Your Chimney Needs Flashing

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

Water damage from flashing leaks will lead to other problems such as:

  • ceiling stains
  • mold
  • roof damage

By keeping your flashing and chimney in good repair, you can prevent a damp mess now, and costly home repairs in the future.


What Exactly is Flashing and How Does it Protect Your Home?

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 where your chimney meets the roof. When made and installed correctly flashing will last as long as your roof.

How Does Damaged Flashing Cause Leaks?

Flashing on your chimney serves as the water barrier between the roof and the brickwork to help 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. We’ve repaired and rebuilt thousands of chimneys in the Kansas City area over the last 30+ years. This experience has shown chimneys with damaged parts always leak.

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.

Full Service Chimney has provided Kansas City area homeowners with repair services and options for over thirty years. We examine your chimney to find the cause of every leak and the damage those leaks have caused. Only then can solutions to your issues be suggested.

Your chimney’s flashing is essential to keeping your home and hearth safe and dry. Think of flashing as the “weather-stripping” between your home and masonry or prefab chimney. It ensures water draining off the shingles of your roof flows around your chimney, rather than into the roof.

What Happens If You Delay Repairs or Replacement?

If your chimney has damaged or missing flashing, then it can cause $1,000’s worth of water damage to your home in a matter of a few rains. Why? Because rainwater will drain from the roof and chimney into the attic, onto ceilings, and into the chimney, where it can damage every surface it touches. The destruction that leaky flashing causes aren’t limited to attic, 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 chimney and flashing leaks to continue without repair will end up costing you many times more than the initial cost to replace flashing.

We are here to help you solve all your chimney and fireplace leak problems.

black chimney flashing on brick chimney

How Much Does it Cost to Replace 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.

3 Types of Flashing Complete a System

The 3 parts of roof flashing are Step and Counter flashing combined with a Cricket. Step flashing diverts water from the roof away from the chimney.  Counter flashing prevents water from leaking into the home. The added Cricket Installation stops water from ponding on your roof. See more details 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

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 needs 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. If the step flashing is too short, or nailed incorrectly, then 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. Water that ponds on roofs, even temporarily, is prone to leaks as shingles 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 crickets are a frequent flashing repair on your chimney.

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.

Can You Add Sealer to Your Flashing?

Oh, yes! A common DIY for leaks is resealing the flashing to the chimney. Often though, patching is not enough to stop water entry.

When Full Service Chimney sweeps are asked to seal flashing, we use the chimney flashing repair product called FlashSeal. It is a two-part chimney repair kit that uses a heavy fabric and elastomeric sealant to form flexible waterproof repair. Flashing sealer is a common chimney repair that we can frequently provide the service on our very first visit to your home.

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


Full Service Chimney provides repair and replacement services for the entire Kansas City metro area homes and has done so for 30 years. We have over 16,000 satisfied customers to show for it!

If you have questions about your Leaky Chimney, and repair options, then Call us at 913-642-6171.

What Our Customers Say

"Great experience with Sam. Was quoted $200 for the inspection and $100 for cleaning when I scheduled the visit. Unfortunately upon inspection, my chimney is no longer safe to use and also made of parts that are apparently a million years old. They obviously didn't charge me for a clean but Sam even comped part of the inspection fee."


"All around excellent service I have nothing bad to say about this company."


"I was extremely impressed with how thorough our technician Chris was during his inspection, especially the printed color inspection report. We have had other companies out at previous homes but nothing like Full Service Chimney. Highly Recommend!"


"I am glad I chose Full Service chimney for our extensive repairs. Now we have the peace of mind of being able to safely use our fireplace in our new home. The reputation of this company is unmatched in Kansas City and came highly recommended from a close friend. Dave and Zach kept me informed throughout the process. In addition they were both incredibly respectful of my home and wer..."


"Kevin was right on time and was sure to call when he was on our way. He asked if he could enter the house, wore a mask the entire time, and left our house cleaner than he found it. (Not an exaggeration — he even took the time to clean some trash out of our empty chimney well that previous roofers had left.) He also let us watch the camera inspection and talked us through everyt..."


Your KC Flashing Repair Professionals

Full Service Chimney sweeps have repaired and replaced chimney systems in the Kansas City area for over 3 decades. We can help solve your leak problems for good with a new installation or a full replacement of your flashing. Call us today!

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