Does a masonry chimney need waterproofing or crown maintenance?
Yes — the crown (the concrete wash at the top of the brick) and the brick itself shed weather all year, and in our freeze-thaw mountain climate that's the number-one way water gets into a chimney. A cracked crown or unsealed brick lets water soak in, then freezes and spalls the masonry. Both are worth checking every year.
What the crown is doing up there
The crown is the sloped concrete or mortar cap poured over the top of the brick, around the flue — think of it as the chimney's roof. Its whole job is to throw rain and snowmelt out past the brick face instead of letting it soak in. Crowns crack because they heat and cool through every burning season, and because plenty of them were built too thin to begin with. Once a crown cracks, it starts doing the opposite of its job: funneling water straight down into the chimney interior, the liner space, and the mortar joints where it does real damage.
Why waterproofing earns its keep in the mountains
Brick and mortar are porous — they drink water. At our elevation, that soaked-in water freezes overnight and expands, and freeze-thaw cycling pops the face off the brick a flake at a time. That's spalling, and we see it weekly on older chimneys around Asheville, Weaverville, and Waynesville. A breathable masonry sealant — a siloxane or silane, not paint — sheds liquid water off the wall while still letting moisture already inside escape as vapor. Paint or any non-breathable coating traps that moisture and makes the spalling worse, so the product genuinely matters here. This is preventive work, cheap next to a rebuild.
How Steady Flame handles it
We inspect the crown, the brick, the flashing, and the cap together during a fireplace inspection, because water usually finds more than one way in. Crown repair, resurfacing, and relining are on our service menu; a full crown rebuild or major masonry restoration goes to our mason partners while we take care of the flue, liner, and cap. Late summer, before the wet, cold season sets in, is the right window to seal and repair. The cheapest version of this job is the one you do before the leak reaches drywall — call (828) 545-0525 for a free assessment.
How we can help
Related questions
- What is a chimney chase cover, and when does it need replacing?
- Do chimney caps need to be inspected or replaced?
- How long does a chimney liner last, and when should it be replaced?
- Does the flashing where the chimney meets the roof need periodic inspection?
- Does an outdoor masonry or stone fireplace need sealing to protect it from freeze-thaw damage?
- How often should a gas fireplace be serviced?
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