Spalling brick (flaking or popping faces) and crumbling mortar mean water has gotten into the masonry and freeze-thaw cycles are breaking it down. Left alone it spreads, so tuckpointing, brick replacement, and waterproofing stop the damage.
What it looks like
Brick faces flaking, popping, or turning to powder, and mortar joints that are recessed, cracked, or missing. You may also see white staining nearby.
Why it happens
Water absorbed by porous masonry freezes and expands, breaking the surface apart. Minnesota's many freeze-thaw cycles make this one of the most common chimney problems here.
How to fix it
Tuckpoint the failed joints, replace damaged brick with color-matched units, and apply breathable waterproofing. Acting early keeps it from becoming a full rebuild.
Frequently Asked Questions
Is spalling brick urgent?
It worsens every winter, so address it before water reaches the liner or framing.
Can damaged brick be matched?
Yes, we source matching brick and color-match mortar.
Will it come back?
Not if the water source is fixed and the masonry is waterproofed.
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