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In the Midwest, masonry chimneys are subjected to extreme cold & hot temperatures throughout the year. Similar to a sponge, masonry will also absorb & retain water – not a good thing in the middle of the winter during freezing temperatures! The multiple freeze/thaw cycles that your chimney experiences weakens the masonry and can cause rapid deterioration. Chimney Sweep uses a water based water repellent that allows the masonry to maintain its breathability without absorbing water.