Can Freeze-Thaw Cycles Crack Chimney Counterflashing in Minnesota?
Yes. Freeze-thaw cycles can crack chimney counterflashing in Minnesota, especially where mortar, sealant, or fasteners already have movement. Water gets in, freezes, expands, and opens the gap wider. By the time you see a ceiling stain, the leak path may already include brick, flashing, sheathing, or the roof deck. Key Takeaways Quick scan Freeze-thaw damage…
