CHIMNEY WATERPROOFING
Chimney waterproofing protects your chimney from rain, snow, and moisture damage by sealing the masonry with a breathable, long-lasting barrier. Proper waterproofing prevents cracks, leaks, mold, and structural deterioration, extending the life of your chimney and improving long-term safety.
Chimney Waterproofing
Chimney waterproofing is essential for protecting your chimney from moisture damage, cracks, mold, and long-term structural deterioration. Since chimneys are constantly exposed to rain, snow, and harsh weather, they naturally absorb water unless properly sealed. Waterproofing creates a protective barrier that prevents moisture penetration while still allowing the masonry to breathe. This service significantly extends the life of your chimney and helps maintain a safe, efficient system. Just like any exterior structure, your chimney requires periodic waterproofing to stay durable, stable, and protected from costly repairs.
When Chimney Waterproofing Is Needed?
Chimney waterproofing is needed when you notice cracks in the bricks or mortar, white staining (efflorescence), moisture inside the firebox, musty odors, or water leaking around the chimney. These issues often appear after years of weather exposure or if the chimney crown or flashing has begun to fail. You may also need waterproofing if the masonry looks darkened from absorbed moisture, if the chimney shows early signs of deterioration, or if you recently completed masonry repairs that require long-term protection. Any signs of water penetration or masonry aging indicate that chimney waterproofing is necessary to prevent further damage.
Chimney Waterproofing Projects
How Chimney Waterproofing Works in 3 Steps
Step 1: Inspection & Surface Preparation
The technician begins by inspecting the chimney for cracks, gaps, loose mortar, or deteriorated surfaces. Any minor repairs—such as repointing or sealing cracks—are completed before waterproofing to ensure the chimney is properly sealed. The masonry is then cleaned of dirt, soot, and debris so the waterproof sealant adheres correctly.
Step 2: Waterproof Sealant Application
We apply a high-quality, vapor-permeable waterproofing sealant to the entire chimney exterior. This protects the bricks and mortar from water absorption while still allowing trapped moisture to escape. The application is performed with professional sprayers or brushes to ensure even coverage and deep penetration into the masonry. Multiple coats may be applied depending on the condition of the chimney.
Step 3: Final Evaluation & Moisture Check
Once the waterproofing material has cured, the technician performs a final inspection to ensure full coverage and proper protection. We check for remaining weak spots, verify that all masonry surfaces are sealed, and confirm that the chimney is now safeguarded against rain and moisture. If additional repairs or crown sealing are recommended, we provide clear guidance to ensure long-term durability.
Recommended Follow-Up Services
After waterproofing, we often recommend: Chimney Crown Repair — to protect the top of the chimney from cracking and water penetration, and Chimney Flashing Repair — if leaks are present where the chimney meets the roof. These services help ensure complete moisture protection for your chimney system.