What is Placed Around a Chimney to Prevent Leaks? 

Here is the question what is placed around a chimney to prevent leaks? We take pride in helping you and other homeowners understand their roof flashing, even their chimney. Here, you will learn about the material used around the chimney, the different types, and more.

Chimney Leaks

There are multiple areas on your roof inclined to leak. To fight this, roofing contractors have materials and methods to keep water away from your home. One of these possible leak areas is around your chimney. 

That’s why we’ll cover the roofing material contractors use to prevent water from entering your home through the chimney.

Chimney to Prevent Leaks

But before that, you should know why you are chimney leaking. So here are some reasons to know about chimney leaking.

Reasons for chimney leaks

We will now glance at the reasons why your chimney is leaking. We look at possible causes, including damaged bricks and mortar, damaged flashing, and a cracked chimney crown. 

Flared Flashing

Flashing is a sheet of metal around the stack of your chimney. It had designed to seal the joints and prevent water from seeping into your chimney.

However, over time it wears out and deteriorates. An ideal way to investigate this issue further is if you have safe access to the roof flashing chimney or attic (where there is a window) so you can take a closer look at the chimney stack. 

Signs of flashing damage include:

  • Salt build-up.
  • Sunlight pierced through any holes or broken elements in the chimney stack.
  • Evidence of water leaking in this area of ​​the chimney.

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Damaged Bricks and Mortar

Another potential cause of a leaking chimney is damage to the chimney stack mortar and bricks. The pointing in bricks and mortar of the chimney may be damaged, allowing water to leak. 

Cracked chimney crown

 A cracked chimney crown can also lead to leaks. A chimney crown is placed above the chimney and above the brickwork.

It is usually of cement and designed to stop precipitation from entering the chimney and causing water damage. If the chimney crown had cracked, it had reduced its ability to prevent leaks. 

Rain at the top of the chimney

Suppose your chimney has not sealed well enough. In that case, it can allow rain to fall directly at the top of the chimney, resulting in significant leakage.

If your chimney is open-top, you may notice rain pouring down your chimney after heavy precipitation. You can view it directly if you have a safe and convenient place to view it. 

Faulty or missing roof flashing tiles

Damaged or missing roof tiles can also cause a leak. It may not be limited to tiles near the chimney stack.

Water can still enter the chimney from a particularly vulnerable area of ​​your roof. If you have a safe way to check your roof flashing, check for damaged or worn tiles and look for any areas on the roof that are bare.

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Problems with Gutters 

If the home’s gutters are clogged or broken, this can cause water to collect in unwanted places before pouring or trickling down your chimney.

A damp chimney is an ordinary sign of a gutter-related problem. A gutter safety inspection of your home can also provide evidence or proof that broken or blocked gutters are causing the leak.

What is Placed Around a Chimney to Prevent Leaks

What is Placed Around a Chimney to Prevent Leaks

What is Placed Around a Chimney to Prevent Leaks? The Roof flashing keeps water away from certain areas of your roof, including the chimney. It ensures that the chimney exit is sealed and watertight when water flows over your roof. Even if your chimney had glazed around it, it’s still possible to see a leak. 

There are two main reasons why your chimney may leak problems with flashing. The first explanation is that the roof flashing was not installed properly. Nothing stops water from entering your chimney and into your home when this happens. 

You need to rely on your contractor’s artistry warranty for this chimney leak or call a new roofer to reflash the chimney properly. The second reason is that the flashing around your chimney had worn out. 

All roofing materials get the end of their lifespan; Ceiling flashing is no different. Improperly installed, water can enter your chimney when the roof flashing reaches the end of its lifespan or is damaged. When this happens, you will have to pay to replace it.

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3 Common Types of Roof Flashing for the Chimney

Now you know where roof flashing goes around your chimney to prevent leaks. However, different roof flashing types expose the chimney and other roof areas to leaks. 

Step Flashing

Step flashing is mainly on the walls and sides of chimneys. It works by placing a bit of metal (flashing) under each shingle installed next to the wall to prevent water from seeping into it. 

Hence the word “step” is in step flashing. You do this in stages by installing one shingle. A sparkling piece, then another shingle, then a portion of flashing until the wall is under complete protection. 

Apron Flashing 

Apron flashing had used at a penetrating wall or foundation. The shape is L-shape and 14 feet long to fit the penetrating foundation. We can also use it around dormers to prevent water from seeping into your windows. 

Counter flashing 

Counter flashing uses on walls and chimneys like step flashing. Unlike step flashing, a portion of the flashing will cut into the existing mortar joint, exposing the metal to the top of the brick.

Like step flashing, we had sometimes installed counter flashing in a stepwise fashion. But if you can see flashing, it’s counter flashing.

Roof crickets are also required to protect your chimney

A roof cricket helps to avoid this problem around the chimney. A roof cricket is a dual triangle structure built behind the chimney to direct water around it properly. 

When water comes from your roof, it hits the Cricket and splits up the two sides instead of hitting the flat border of your chimney. If you do not have a cricket, water pools behind your chimney, and repairing the damage once it leaks can be costly. 

To prevent this from happening, the IBC (International Building Code) has made installing crickets an original building code since 2012. According to the code, we must install chimneys 30 inches wide cricket perpendicular to the slope of the roof. 

If you have a ceiling built before 2012, you may not have installed Cricket. But when it’s time to replace your ceiling, ensure it is up to code and that Cricket has installed to prevent leaks. 

Suppose your roof is replaced through homeowners insurance and a code upgrade coverage policy. In that case, your insurance company will pay to install your Cricket.

Preventing Your Chimney from Leaking

You can take several steps to prevent chimney leakage from happening in the first place. We will now cover various measures you can take to prevent leaks, such as regular cleaning and regular chimney vacuuming. 


One of the most practical ways to protect your chimney against leakage is to clean its interior regularly. We can use a brush to clean the chimney of debris, soot, and dust collected along its walls. It reduces the chance of damage. 

Chimney Sweeping

Cleaning your chimney or having your chimney swept by a hired professional regularly can have the same benefits as cleaning the underside of your chimney.

Regular Inspections/Service

Having the chimney inspected or serviced regularly can prevent problems before they become more serious. Such inspections allow early detection of cracks or damaged flashing on the chimney crown and repair them before any serious problems arise.

Regularly unblocking gutters

Removing any blockages in your home’s gutters can prevent leaks. You can help protect your chimney from water leaks by checking your gutters and unblocking them regularly.

Chimney Rain Cap

 Installing a chimney rain cap can pay dividends by reducing the risk of leakage, especially during or after heavy rain. A rain cap is an umbrella to prevent precipitation from building up in your chimney.


After reading this article, you now know what’s going on around your chimney. And what is placed around a chimney to prevent leaks? Both roofs flashing and crickets are critical to preventing water from entering your chimney and leaking into your home.

Frequently Asked Questions 

1. What is a chimney rain cap?

A rain cap for a chimney sits on top of the flue and protects the chimney from precipitation. While you can buy a rain cap, a DIY chimney cap is also possible. This cap helps prevent chimney leaks when it rains. 

2. What is flashing? 

Chimney flashing is a metallic sheet that makes a point of connection between the chimney and the roof waterproof.

3. How long does a chimney crown last?

A chimney crown can have a lifespan of up to 75 years. 

4. How often should I clean my chimney? 

It would help if you had your chimney cleaned at least twice a year. 

5. What type of sealant can I use to fix a chimney?

You can use a suitable silicone sealant, but the exact preferred sealant will vary depending on which part of the chimney needs repair.

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