Here is an example of a brick veneer chimney. Inside the brick veneer there is wood framing to attach the brick to and a metal pipe to exhaust hot air through the chimney cap. Brick veneer chimneys are much more prone to soak up water and seep into living spaces below causing moisture damage. Solid masonry chimneys are continuous from the ground up through the roof, so oftentimes moisture passes through undetected.
This is the clear gel that I use to cover masonry chimneys. It dries clear and hard like an acrylic.
Once applied to the surface, it will give a somewhat shiny appearance that will dull over time. Most of the time, only a portion of the chimney needs to be coated. Usually three sides from the top down to the level of the roof itself. If the chimney is more centered in the house instead of on the exterior wall then all four sides would need to be done.
Any larger cracks can be filled with the clear sealant sold here on this site and then the gel applied over top.
Here is a picture below of a solid masonry chimney that this same gel was applied to including the masonry cap on top. Sometimes that is what is necessary to keep the moisture from penetrating through to the interior of the home. It took about one gallon of waterproofing compound to do this chimney @ approximately $75.00 purchased locally. If you are interested in purchasing this product, please contact me for more details.
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