Why You Should Waterproof Your Chimney | Prevention Is Key

Water is the number one enemy of your chimney. However, many homeowners with a fireplace overlook waterproofing as preventative maintenance. In this post, we show water’s effects on your chimney and why it’s crucial to waterproof it before winter’s onset.

leaky chimney in Prairie Village KSWater and Chimney Damage

Winter and the harsh conditions that come with it can significantly and negatively impact your chimney. Here’s what can happen.

Freeze-Thaw Cycle

The freeze-thaw cycle that happens during winter can wreak havoc on your chimney. When water penetrates the bricks and mortar, it freezes and expands. The continuous expansion causes the masonry materials to crack and eventually break apart. As ice thaws, it contracts, leaving space for more water to seep in, and the cycle continues, worsening the damage. 

Spalling Bricks

One visible sign of winter’s wrath is called brick spalling; the visible signs are pieces of the brick’s surface peeling or crumbling away. Spalling doesn’t only look bad; it weakens the chimney’s structural integrity, leading to potentially costly repairs or a total rebuild.

Metal Corrosion

Harsh winter conditions can also cause your fireplace and chimney’s metal components, like the flue liner or damper, to rust. A corroded flue liner increases the likelihood of a chimney fire, and a rusted damper won’t open and close properly, resulting in heat loss.


If you notice a white powdery residue on your chimney, it’s probably efflorescence. Efflorescence happens when moisture moves through masonry materials, leaving behind tiny crystals on the surface as it evaporates. While not harmful, it’s a clear sign that your chimney is taking in water, which can lead to significant damage over time.

Deteriorating Mortar Joints

The mortar joints between the bricks are the glue that holds the structure together. When these joints become damaged, they’re more susceptible to water penetration, which can compromise the chimney’s structural integrity and require repointing to fix. 

Mold and Mildew

The damp conditions caused by water penetration provide the perfect breeding ground for mold and mildew in the chimney. Once mold takes hold, you may notice musty odors from the fireplace. The presence of mold can also affect your health, especially if you suffer from allergies or upper respiratory conditions. 

Why Waterproofing is So Important

As you can see, water is incompatible with your chimney, and here’s why you should hire a pro to take care of this before winter arrives.

Protection from Water Damage

The primary reason to get your chimney waterproofed is to protect it from the water damage common in winter. Waterproofing creates a barrier that prevents water from seeping into the bricks and mortar and the adverse effects that come with it.

Mold and Mildew Prevention

As mentioned, water and a warm chimney is a fertile environment for mold growth. Waterproofing keeps it dry and prevents harmful mold spores from taking hold, reducing the odor and ensuring a healthier environment. 

Maintain Chimney Efficiency

A well-maintained chimney contributes to the overall efficiency of your fireplace. When moisture gets into the chimney walls, it can cause deterioration, impeding proper ventilation and putting you and your family at risk of carbon monoxide poisoning. 

chimney waterproofing in Kansas City KSLong-Term Cost Savings

Chimney masonry repairs are expensive. And while there’s an upfront cost with waterproofing, it’s a drop in the bucket compared to repointing or a total chimney rebuild. Waterproofing is a cost-effective preventative maintenance tool that will save you from expensive repairs and headaches down the road.

Preserving Home Value

Your home is probably your most significant investment, and you want to maintain and improve its value, even if you don’t intend to sell. A damaged chimney could be a detriment to potential buyers, and it signals to the neighbors that you don’t take care of your house. Waterproofing ensures your chimney remains in good physical and visual condition, thus preserving or increasing your home’s overall value. 

Easier Maintenance

Once your chimney is waterproofed, it becomes easier to maintain. Today’s waterproofing products are designed to last for years, making it a relatively low-maintenance solution. A waterproofed chimney may only require regular inspections and minor touch-ups to keep it pristine. 

Peace of Mind

Finally, waterproofing your chimney before winter gives you peace of mind, knowing it’s protected against whatever Mother Nature has in store, allowing you to enjoy your fireplace throughout the long, cold months knowing everything is safe. 

Call Fluesbrothers Chimney & Fireplace

Fluesbrothers Chimney & Fireplace is the most trusted chimney and fireplace company in Kansas City. Our technicians are certified by the Chimney Safety Institute of America (CSIA), and our founder is a CSIA-certified master chimney sweep.

Whether you need waterproofing, chimney inspections, tuckpointing, rebuilding, repairs, or routine maintenance, you can count on us for high-quality work and outstanding customer service. 

Book us today by calling 913–236–7141