Some of the hardest winter work in Norwood happens twelve feet off the ground. When a January week runs warm at noon and hard-frozen by nine at night, meltwater creeps back under the shingles and ice builds a ledge along every eave on the street. O'LYN Roofing works those edges — freeing ice dams, raking heavy snow off the rooflines, and clearing the entries and walks below so nothing comes down where somebody stands. From a ladder above Nahatan Street you can see the whole low skyline of the town, a Franklin Line train pulling out of Norwood Central, chimney smoke going flat in the wind. What makes the day is the sound that comes afterward: a clean eave line ticking water into the driveway, the roof breathing easy again.