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Heavy amounts of snow could be a problem. In many climates, lots of snow on your rooftop can lead to freeze-thaw cycle that create ice dams, which can damage rooftops. But if you’re using shingle clips, this snow poses an additional problem: As it melts and freezes, it can easily dislodge clips you’ve placed on your roof.

You can clean snow off your roof after a fresh snowfall while it’s still lightweight, but brushing off snow can also dislodge your clips. If you get a lot of snow, then roof clips become less viable.

No one has figured out a perfect solution to this problem. Tying icicle lights down or adding weights to them can help, but it’s a very time-consuming process and far from foolproof. If your winters are too windy, we suggest simply switching away from icicle lights to straight runs of non-dangling lights along the edge of your roof.

The average cost to have a professional install Christmas lights on a roof is about $420, with most homeowners spending between $220 and $650. Some companies may charge between $1.25 and $3 per square foot, excluding the cost of the lights. For extensive or complex jobs, the cost can exceed $1,000. While doing it yourself can save money, it is only recommended if you are comfortable working at heights.

To hang Christmas lights outside without nails, consider using alternatives like adhesive hooks, gutter clips, or even hot glue. These options allow you to secure lights to various surfaces without causing damage to your roof or siding. Be sure to clean and prepare the surface before applying these alternatives for better adhesion.