Chimney Waterproofing in Northern NJ

Starting at Free Estimate

Why Waterproof Your Chimney?

Water is the number one enemy of masonry chimneys. Bricks and mortar are porous materials that absorb water like a sponge. In Northern New Jersey, where we experience heavy rainfall, snow, and ice throughout the year, this moisture absorption leads to accelerated deterioration. When water enters the masonry and freezes, it expands by approximately 9%, cracking the brick and mortar from the inside. This freeze-thaw cycle repeats hundreds of times each winter in our region.

Chimney waterproofing creates an invisible barrier that prevents water from penetrating the masonry while still allowing moisture vapor from inside the chimney to escape. It is one of the most effective preventive measures you can take to extend the life of your chimney.

The Damage Water Causes to Chimneys

If you have ever noticed any of these issues, water is likely the culprit:

• Spalling Bricks: The face of the brick pops off or flakes away due to internal ice expansion.
• Efflorescence: White, chalky staining on the exterior indicates water is moving through the masonry and depositing mineral salts on the surface.
• Crumbling Mortar: Mortar joints erode faster when exposed to repeated wetting and freezing.
• Interior Water Stains: Water leaking through the chimney structure causes brown stains on ceilings and walls.
• Rusted Damper or Firebox Components: Moisture entering the chimney corrodes metal components.
• Musty Odors: Persistent dampness in the chimney leads to mold and mildew growth, which causes unpleasant smells.
• Deteriorated Flue Liner: Water accelerates the breakdown of clay tile and even stainless steel liners over time.

Our Waterproofing Process

Santa's Sweepers uses professional-grade, vapor-permeable waterproofing products specifically designed for masonry chimneys. Here is how the process works:

1. Inspection: We examine the chimney for existing damage that needs to be repaired before waterproofing. Applying sealant over damaged masonry is like painting over rust; it does not solve the underlying problem.
2. Repair: If we find cracked mortar, spalling bricks, or crown damage, we recommend completing those repairs first. Waterproofing works best on sound masonry.
3. Cleaning: The chimney exterior is cleaned to remove dirt, algae, and loose material. The sealant bonds best to a clean surface.
4. Application: We apply the waterproofing agent using a low-pressure sprayer, ensuring even coverage on all exposed masonry surfaces. The product penetrates into the pores of the brick and mortar.
5. Drying: The sealant cures within 24 to 48 hours. Once dry, it creates an invisible, breathable barrier that repels liquid water while allowing water vapor to escape.

Why Breathable Sealants Matter

Not all waterproofing products are suitable for chimneys. Standard paint or non-breathable sealants trap moisture inside the masonry, which actually accelerates damage. The products we use are vapor-permeable, meaning they block liquid water from entering while allowing any trapped moisture vapor to escape outward. This is essential for chimney longevity.

How Long Does Waterproofing Last?

Professional chimney waterproofing typically lasts 5 to 10 years, depending on exposure and weather conditions. In heavily exposed locations, such as chimneys facing prevailing winds in elevated areas of Sussex or Warren counties, reapplication may be needed sooner. We recommend checking your waterproofing during your annual chimney inspection.

Related Services

• Chimney Certification
• Chimney Repair
• Chimney Cap Installation
• Chimney Inspection ($99)
• Chimney Cleaning ($199)