Wet winters and freeze-thaw are hard on chimneys in Langley. Here's what causes the damage and the early signs worth watching for.
If you've found chips of mortar or small bits of brick in the yard near your chimney, that's not nothing. It's usually the first sign that water has been working its way into the masonry. In Langley, the mix of heavy rain and the odd hard freeze is about the worst combination a chimney can face, and it quietly takes a toll year after year.
Here's what's actually going on up there, and the signs worth catching before a small repair turns into a full rebuild.
It starts with water and freeze-thaw
Brick and mortar are porous. They soak up a little water every time it rains. On its own that's fine. The problem is what happens when that soaked-in water freezes. Water expands as it turns to ice, and that tiny bit of pressure, repeated through every cold snap, pushes the face of the brick and the mortar apart from the inside.
Over a few winters you get spalling, where the face of the brick flakes or pops right off, and mortar joints that turn soft and sandy. Langley doesn't freeze as hard as the Prairies, but we get just enough freeze-thaw cycling through the winter to do real damage to an older chimney.
The crown is usually the first thing to go
The crown is the concrete slab on the very top of the chimney that sheds water away from the brick. It takes the full force of the weather, so it's often the first part to crack. Once the crown cracks, water runs straight down into the chimney instead of off it, and everything below it starts to fail faster.
A cracked crown is one of the cheapest things to fix and one of the most expensive to ignore.
Early signs worth a look
You don't need to climb up to spot most of these. A look from the ground with binoculars catches a lot:
- White, chalky staining on the brick (called efflorescence) means water is moving through the masonry
- Mortar joints that look recessed, cracked, or are missing chunks
- Bits of mortar or brick on the roof or in the yard
- A crown with visible cracks or missing pieces
- Rust streaks from the cap or damper
- Any visible lean or step in the chimney line
Repair now, or rebuild later
Caught early, most chimney problems are a repointing job and a crown repair. The mortar joints get raked out and repacked, the crown gets patched or rebuilt, and the chimney is weatherproofed so water stays out. That's a far smaller job than waiting until the brick is loose and the top of the chimney has to come down and get rebuilt course by course.
If you're in Langley City or one of the older parts of town with a chimney that's never been touched, it's worth getting eyes on it. Give us a call and we'll come out, take a look, and tell you straight whether it needs a repair now or just a note to check again next year.