
Brick faces flaking off, or mortar turning to sand?
- Flakes or whole faces of brick on the roof or in the yard, worst in spring
- Mortar you can rake out of the joint with a house key
- White chalky staining spreading across the stack
Why it happens in Norwood: The temperature in Norwood crosses freezing roughly 91 times a year, and every crossing expands the water already soaked into brick and mortar by about nine percent. It is that repetition, not any single cold night, that opens joints and takes the fired face off older brick. The one repair that makes this worse is repointing with modern high-strength cement: harder than the old brick, it forces the brick to take the movement instead, and the faces spall off around joints that still look perfect.
What fixes it, and what it costs
Repointing with a mortar matched to the original (raked to depth, refilled, cured above freezing) and recasting the crown where it has opened. Where faces have already spalled through, the affected courses are rebuilt with matched brick. Then, and only then, a vapor-permeable water repellent, because sealing water into a wet stack is worse than doing nothing.
- One accessible face
- $400–$1,200
- Full stack, four faces
- $1,500–$4,000
- Flexible seal over a sound crown
- $200–$500



















