For over 12 years, GMT Home Services has proudly served 3,000+ homes across Connecticut, Massachusetts, and Rhode Island, keeping families safe through professional chimney waterproofing services. Our team is CSIA-certified (Chimney Safety Institute of America) and trained in NFPA standards, ensuring every job is completed with unmatched safety and precision.
Your masonry chimney is strong against heat but vulnerable to the elements. Rain, snow, and freeze-thaw cycles can slowly wreak havoc on brick chimneys, chimney crowns, mortar joints, and the roof line. Left untreated, water intrusion leads to:
The damaging effects of water can compromise the structural integrity of your entire chimney. The Chimney Safety Institute of America recommends applying a chimney water repellent or chimney sealant to prevent these risks and create a watertight seal.
We use ChimneySaver, a waterproofing product developed specifically for masonry chimneys. Backed by ASTM tests conducted on durability and effectiveness, ChimneySaver provides long-lasting protection against water penetration while allowing the chimney to “breathe.”
Here’s how our process works:
This process prevents water damage, extends chimney life, and gives you confidence that your chimney is safe for the winter months.
Small cracks in mortar joints or a worn chimney crown may not look serious—but when rain seeps in, freeze-thaw cycles wreak havoc on your masonry chimney. Don’t wait until costly damage appears.
Installing a chimney cap helps block rain and debris—but it can’t stop water from soaking into masonry chimneys. To fully prevent water damage, your chimney also needs:
These solutions reduce water penetration, protect against freeze-thaw cycles, and stop safety hazards caused by trapped moisture.
Brick chimneys are especially vulnerable because bricks and mortar joints naturally absorb moisture. Without protection, water vapors expand during freeze-thaw cycles, leading to spalling, cracks, and eventual costly damage.
With ChimneySaver water repellents, ASTM tests show that nearly every chimney can be protected—up to 99.9% reduction in water penetration—while still allowing moisture and trapped water vapors to escape.
If you notice stains near your roof line, damp odors, or leaks in your fireplace, water penetration is already reducing your chimney’s structural integrity. Without a waterproof chimney sealant, trapped moisture can lead to mold and health problems.
The cost of chimney waterproofing depends on:
On average, one gallon of repellent covers about 100 square feet. While DIY products exist, only a professional chimney waterproofer can ensure a true watertight seal that lasts for years. Investing now prevents costly repairs later.
It may be tempting to buy a chimney sealer and try a quick DIY fix, but there are serious risks:
Our certified team applies water repellents tested to withstand freeze-thaw cycles, giving you professional results with warranties for long-lasting protection.
When temperatures drop, water trapped in bricks expands—causing cracks, leaks, and dangerous safety hazards. A proper chimney water repellent provides long lasting protection against freeze-thaw cycles and prevents water damage year-round.
Once your chimney is protected, it’s important to maintain it:
Regular care prevents leaks, costly repairs, and safety hazards—keeping your fireplace, roof, and home safe during harsh winter months.
With 12+ years of experience, CSIA and NFPA credentials, and more than 3,000 homes served, GMT Home Services is one of the best chimney waterproofing companies in Connecticut. Our reputation is built on:
Don’t wait until moisture, rain, and freeze-thaw cycles cause costly damage to your chimney and home. Get ahead of the problem with a watertight seal and expert care.With our certified expertise and long-lasting protection, your chimney will stay safe, strong, and ready for every season.
Chimney waterproofing prevents water penetration that can damage brick chimneys, mortar joints, and chimney crowns. Without a protective layer, freeze-thaw cycles cause cracks, leading to costly repairs and safety hazards.
Water intrusion can weaken mortar, bricks, and the chimney crown. Over time, trapped moisture expands when temperatures drop, reducing structural integrity and causing further damage to the entire chimney.
A chimney cap keeps out direct rain and debris at the roof line, while a waterproofing product—such as a vapor permeable chimney sealer—creates a watertight seal across the brick surface and mortar joints to reduce water penetration.
Yes. Nearly every chimney, whether brick, stone, or masonry, can benefit from chimney water repellent treatment. It protects against leaks, prevents water damage, and extends the life of materials like concrete and mortar.
Choose a chimney water repellent product developed specifically for masonry chimneys and tested to ASTM standards. Solvent-based and vapor permeable formulas, like Chimney Saver, trap water vapors while preventing rain from soaking into bricks.
With proper application of a chimney sealant—often applied with a garden sprayer in one gallon coats plus a second coat for maximum protection—long lasting protection can extend for 10+ years before reapplication is needed.
Yes. By preventing leaks and trapped moisture, waterproofing reduces the risk of mold growth inside the home, protecting indoor air quality and minimizing potential health problems.
The cost varies based on the size of the job, type of brick chimney, and extent of existing cracks or water damage. Many certified chimney professionals offer free estimates and detailed inspections before sealing the chimney.
