Chimney Waterproofing Services
Stop Chimney Leaks—Protect Your Masonry for the Long Term
Moisture is one of the biggest threats to any chimney. In fact, most chimney damage is caused by water working its way into the masonry. Once inside, water can freeze, expand, and break apart bricks and mortar, leading to cracks, spalling, and structural deterioration.
At Chimney Knights, we provide professional waterproofing and leak-prevention services that shield your chimney from the elements and help stop leaks before they start. Whether you’re already dealing with a moisture issue or simply want to protect your investment, our waterproofing solutions offer long-lasting defense.
Why Masonry Chimneys Need Waterproofing
Brick and mortar are naturally porous—they absorb water from rain, snow, and melting ice. Over time, repeated freeze–thaw cycles force the masonry to expand and contract, causing damage that grows worse with each season. As water penetration increases, so does the pace of deterioration.
To break this cycle, we apply ChimneySaver Water Repellent, one of the most trusted and widely used waterproofing products in the chimney industry. This professional-grade solution protects your chimney without trapping moisture inside, ensuring both durability and breathability.
The Benefits of ChimneySaver Water Repellent
ChimneySaver is specifically engineered for chimney masonry and offers key advantages:
Breathable protection: Blocks exterior moisture while allowing internal vapor to escape
No glossy or artificial finish: Preserves the natural look of your brickwork
Environmentally friendly formula
Defense against cracking, staining, mildew, and freeze–thaw damage
Backed by a 10-year warranty
This treatment provides long-lasting moisture protection and helps your chimney maintain its structural strength and visual appeal.
Complete Leak Protection for Your Chimney System
Applying a water repellent is one of the most effective steps you can take to prevent chimney leaks—but it’s not the only one. For full protection, the entire chimney structure must be in good condition.
Our team can address all common leak sources, including:
Cracked or deteriorated crowns
Damaged, loose, or improperly installed flashing
Worn mortar joints or brickwork
Missing or failing chimney caps
Masonry damage caused by years of moisture exposure
When combined with waterproofing, these repairs create a complete barrier against water intrusion.
Flashing Repair & Replacement Services
Is Damaged Flashing Letting Water Into Your Home?
Flashing is one of the most important components of a leak-free chimney. This metal barrier seals the transition where your chimney meets the roofline, preventing water from slipping into the home. When flashing fails, leaks often follow.
Common flashing issues include:
Gaps or lifted sections
Excessive nail holes
Dents or poorly fitted metal
Low-quality material that corrodes or deteriorates
Incorrect installation that leaves openings for water
Even minor flashing defects can lead to major water damage inside ceilings, walls, and framing.
The Importance of Quality Flashing & Regular Inspections
While premium materials like stainless steel and copper offer excellent longevity, proper installation is just as important as material quality. Routine inspections help catch problems early, preventing costly water damage later.
Our CSIA-certified technicians conduct thorough annual inspections to identify flashing concerns as well as other chimney vulnerabilities. Early intervention keeps repairs manageable and preserves your chimney’s integrity.
Professional Flashing Repair & Upgrade Services
If we discover flashing issues during your inspection, our team can:
Repair minor gaps or damage
Replace failing flashing with high-quality, rust-resistant materials
Install new flashing with proper step, counter, and base components
Apply a flexible waterproof flashing sealant for added protection
Chimney Crown Repair & Rebuild Services
If a Damaged Crown Is Causing Your Leak, We Can Fix It
The chimney crown sits at the very top of the chimney and acts as the first line of defense against rain, snow, and debris. While it is built to withstand the elements, crowns can crack, crumble, or deteriorate over time—especially if the original crown was poorly constructed.
A failing crown is one of the leading causes of chimney leaks, and addressing the problem quickly is key to preventing further damage.
Our Crown Repair Solutions
We offer several professional options to restore or replace a damaged chimney crown:
Crack Repair with CrownSeal
For crowns that are structurally sound but beginning to show cracks or small openings, we apply CrownSeal, a flexible, waterproof coating designed to seal and protect the crown. Benefits include:
Long-lasting weather resistance
Appearance similar to natural mortar or concrete
Environmentally friendly formula
Color-matching options
A 10-year warranty
CrownSeal stops moisture penetration and greatly extends the life of your existing crown.
Complete Crown Rebuild
If the crown is severely damaged or was poorly built from the start, a full rebuild may be necessary. Our rebuilds include:
Correct slope for proper water runoff
Adequate thickness for strength and durability
A built-in drip edge to redirect water away from the masonry
High-quality materials and construction practices
A properly rebuilt crown provides decades of protection.
Crown Waterproofing with CrownCoat
To prevent future deterioration, we also offer CrownCoat, a durable waterproof sealant that creates a flexible, protective membrane over the crown. With a 15-year warranty, CrownCoat shields the crown from cracking and weather wear while maintaining its natural appearance.
Professional Leak Diagnosis & Repair
The source of a chimney leak isn’t always obvious, but our CSIA-certified professionals have the training and experience to pinpoint the problem quickly. Whether the issue lies in the crown, flashing, masonry, or elsewhere, we provide proven solutions that stop water intrusion and protect your chimney for years to come.