Roof shingles installed in late fall may not have a chance for the heat-activated adhesive to warm up and stick together, according to columnist Zolton Cohen. The adhesive glues the shingles together to prevent them from blowing off in high winds. Cohen writes "overcast weather conditions, cold weather, snow cover, or shingles installed on the north slope of a roof can go an entire winter without warming up enough to stick together."

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