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WASHINGTON — We discovered another result of how extreme weather affects RV weatherstripping. The vinyl strip inserted in the channel molding doesn’t only dry and crack over time, it shrinks!
Over time, repeated exposure to freezing winters and desert heat caused the strip in the channel molding along our roof to shrink. It also buckled and popped out of the channel at the seams where the molding was pieced together. This caused the dreaded black streaks where water leaked out of the roof drainage channel.
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