Can you tell if a prior coating was the wrong type?

Often yes, a shiny plastic-looking surface or worsening spalling both point to a film-forming product.

Chimney Waterproofing in Dallas-Fort Worth

Q: Isn't any waterproofing better than none?

Not necessarily; a film-forming sealer that traps moisture can accelerate brick damage.

Q: How long does a proper sealant last?

Typically 5 to 10 years depending on sun and weather exposure.

Q: Will waterproofing fix an existing leak?

No, it's preventive; an active leak needs the specific cause, usually crown or flashing, repaired first.

Chimney waterproofing, done with a sealant that actually lets brick breathe

Not all waterproofing products are equal, and the wrong one can make spalling worse instead of better. We use a vapor-permeable siloxane or silane-based sealant, never a film-forming paint or coating that seals moisture in.

Vapor-permeable Photo-documented CSIA certified

Brick is naturally porous, and that is by design, it needs to let moisture that gets in eventually get back out. A film-forming, paint-like waterproofer seals the surface completely, and any moisture already inside the brick, or that finds a way in through a crack elsewhere, gets trapped, which accelerates spalling instead of preventing it.

Why the right product matters more here than in milder climates

DFW brick goes through real freeze-thaw stress in winter and intense UV and heat in summer. A breathable siloxane or silane sealant penetrates the brick and repels liquid water at the surface while still allowing water vapor to escape from inside, which is exactly what this climate’s brick needs to avoid trapped-moisture damage.

If a chimney was previously coated with a paint-on waterproofer, we will tell you honestly, removing that coating is sometimes part of the job before a proper breathable sealant can do its work.

What waterproofing includes

Assessment of existing brick condition and any prior coatings

Application of a penetrating, vapor-permeable siloxane or silane sealant

Coverage of the full masonry chimney, not just the areas with visible damage

A sealant that typically needs reapplication every 5 to 10 years, not a permanent one-time fix

Combined with crown and flashing repair when those are also leak sources

Who benefits most from waterproofing

Older, original brick

Chimneys with the original mortar and brick from a pre-1990s build benefit most from added protection.

Homes with a history of spalling

Sealant slows future moisture damage once existing spalled brick has been repaired.

Chimneys facing prevailing weather

West and south-facing exposures in DFW take the brunt of wind-driven rain and sun.

Newly repointed masonry

Sealing fresh mortar work protects the investment in a recent repair.

Frequently asked questions

Isn’t any waterproofing better than none?

Not necessarily. A film-forming sealer that traps moisture can genuinely accelerate brick damage, which is why the product matters as much as the decision to waterproof at all.

How long does a proper sealant last?

A quality siloxane or silane sealant typically holds up for 5 to 10 years before needing reapplication, depending on sun and weather exposure.

Will waterproofing fix an existing leak?

No, waterproofing is preventive. An active leak means a specific failure, usually the crown or flashing, that needs to be repaired first; sealant protects sound masonry going forward.

Can you tell if a previous coating was the wrong type?

Often, yes. Signs like a shiny or plastic-looking surface, or spalling that has worsened since a prior coating was applied, both point to a film-forming product that should be addressed.