Waterproofing Your Chimney

Water damage plays a huge role in shortening the lifespan of a chimney and should be addressed before it is an issue. The quality that makes brick such a durable and excellent material for building fireplaces and chimneys is the same quality that makes it vulnerable to water damage. Brick is porous by nature which means it breathes. This porosity allows smoke and heat to escape, making brick very safe and durable under high temperatures. However, the porosity of brick also allows water to bleed in which can lead to corrosion, lime-leaching and cracks. Anytime water is allowed into the brick, the structural security of the chimney is compromised.

In addition to the corrosive nature of water, it also changes physical states as the temperatures change. When the temperature drops drastically and then warms back up, a cycle of freezing and thawing (constricting and swelling) can take place where the water has penetrated the brick. Over time, this process will lead to the complete crumbling of the penetrated brick. To prevent this from happening and threatening the structural safety of your chimney system, it is important that you have your chimney properly and professionally waterproofed.

What’s Involved In Waterproofing?

There are many waterproofing options out there, but it is important that you have a professional’s advice and application. Many sealers advertised as waterproofing products are actually silicone-based and coat the chimney with a waterproof layer. The problem with these sealers is that they not only keep water out, they keep air out and trap water vapor in. But, as you now know, it is vital that brick be allowed to breathe.

At White Glove, we know the role that porosity plays and only use vapor-permeable sealers such as Chimneysaver’s Solvent-Based Water Repellent. Unlike silicone sealers, ChimneySaver allows air and water vapor to enter and exit the brick while keeping water molecules (which are larger) out.

Chimneysaver’s water repellent products come with a ten-year warranty and promise the following qualities:

  • 100% vapor permeable
  • Matte finish
  • Prevention of efflorescence and staining
  • Prevention of mildew and fungus
  • Protection from the freeze/thaw cycle

For more information on their products, check out their website.

Whether your chimney is ancient or brand new, waterproofing is a must. And as always, prevention is much cheaper than repair! Call us today or click here to schedule your appointment online!


There could be other issues causing your chimney leak, so call on the experts at White Glove to help you find and fix the problem before things get worse. Our experienced staff can provide reliable, long-lasting results for this chimney and fireplace repair.