Holiday lights and decorations are lightweight, but the way they are attached and removed matters. Staples, nails, or screws used to secure lights can leave tiny openings in shingles, fascia, or trim. These penetrations may not leak immediately, but they allow moisture to enter slowly with repeated winter rain. Over time, that moisture can reach the roof deck or insulation, setting the stage for rot or mold.

Foot traffic also takes a toll. Walking on your roof to hang lights or adjust decorations can scuff protective shingle granules or loosen shingle edges. Shingles tend to be less flexible in cooler weather, which means they are more likely to lift or crack when pressure is applied. Even careful steps can weaken areas along the eaves and ridges where decorations are most often installed.

Gutters and fascia experience stress as well. Gutters are designed to move water, not to support cords, clips, or heavy décor. Over a season, repeated pulling from wind or the weight of lights can loosen fasteners or change gutter slope. When that happens, water may no longer drain correctly, leading to overflow or pooling near the roof edge.