Owning a fireplace is a joy for many homeowners. There’s nothing quite like the ambiance of a roaring, crackling fire during winter. And while the chimney needs regular cleaning to keep it in good shape, there’s more you can do to improve performance and safety, and that’s installing a chimney crown. But what is a chimney crown, and why is it so important? Let’s take a look.
What is a Chimney Crown?
The chimney crown sits atop a masonry chimney; it’s not the same as a cap, which is a metal piece covering the flue opening. The crown is a cement or mortar slab that seals the space between the flue liner and the chimney’s exterior walls. Its main job is directing water away from the chimney to prevent moisture from getting in and wreaking havoc.
Chimney crowns are typically constructed of concrete or metal and sloped downward to allow rainwater to flow off the chimney instead of pooling. As we’ll see, water is the number one enemy of your chimney, and it’s crucial to prevent moisture from causing damage.
Why is the Chimney Crown Important?
As mentioned, water is terrible for a masonry chimney. The crown is the first line of defense against the elements, particularly water. Without a solid and intact crown, water can seep into the bricks, mortar, and other parts, leading to various problems that can be costly and dangerous.
Here are some key benefits of having a chimney crown.
Prevents Water Damage
The main function of a chimney crown is to protect the chimney against water intrusion. By creating a barrier at the top, the crown prevents rain, snow, and ice from penetrating the masonry materials. Without this protection, water can get in, freeze during winter, and cause cracks that expand over time, leading to further deterioration and more costly repairs.
Preserves the Chimney’s Integrity
A well-maintained crown preserves the chimney’s structural integrity. Water seeping into the mortar joints can cause them to break down, weakening the entire chimney through crumbling bricks. A deteriorating chimney isn’t just an eyesore; it’s a serious safety risk.
Prevents Mold & Mildew
As if water damage wasn’t bad enough, excess moisture creates the perfect breeding ground for mold and mildew. This creates foul odors, contributes to poor indoor air quality, and can severely affect people with allergies or upper respiratory conditions. By keeping water out, the crown helps guard against mold and mildew growth.
Increases the Chimney’s Lifespan
The crown protects the chimney from water damage, helping extend its lifespan and reducing the chance of needing expensive repairs or a complete rebuild in the future.
Maintaining the Crown
The crown requires regular maintenance like the other chimney components. Here’s what experts recommend:
Schedule Regular Inspections
Regular inspections by a licensed chimney professional, preferably once a year, especially prior to winter, are the greatest method to maintain the health of your crown. When doing an examination, the technician will look for erosion, cracks, or other indications of wear and water damage that can jeopardize the crown's capacity to shield the chimney.
Address Damage Immediately
Delaying repairs may seem okay for now, but the issue is that they only worsen and cause more serious problems. While skipping these small repairs might save you money initially, the damage will become worse over time, ultimately costing you more. It's essential to fix minor problems as soon as you identify them.
Apply a Waterproof Sealant
Waterproofing the crown will give an extra layer of protection against moisture. Remember, most crowns are made from concrete, which is susceptible to water intrusion, just like bricks and mortar. A high-quality sealant specifically designed for masonry chimneys can prevent water absorption. Modern sealants can last several years, making them an inexpensive yet crucial investment.
While a chimney crown may not be the most glamorous part of your home — certainly not one you’ll want to show off to guests — it’s a crucial piece that helps maintain the safety and integrity of the chimney. Without one, or if the crown is damaged, you open the door to a host of problems from water damage and potential fire hazards.
If you’re worried about your chimney crown, call Keystone. We look forward to helping you with all your chimney and fireplace needs.
