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Gaps between tiles are necessary to help with weatherproofing, allow for thermal expansion, and increase wind resistance. In general, a small gap no larger than 3 millimeters wide will encourage proper drainage and limit cracking. Beyond that, tiles should overlap a minimum of 3 inches, except at the eaves where they should extend to the center of the gutter.

The ridge is the horizontal line where two sloping roof sections meet at the top, forming the highest point of the roof. A hip, on the other hand, is the external angle formed where two roof sections meet and slope downward toward the walls, typically at a lower angle than the ridge. The ridge runs horizontally along the peak and the hip runs diagonally from the peak to the roof's edges.

If your home doesn't have gutters, you can still hang Christmas lights on the roof using specialized clips. Use roof clips designed to attach to shingles or fascia. For tile roofs or the edges of the rooftop, consider using parrot clips. Adhesive light-hanging clips are also a great option. It's important to avoid using nails or staples, as they can damage your roofing material. For unique or complex installations, it's best to consult a professional Christmas light installer to find the safest and most effective solution for your home.

Depending on the condition of your roof, you may be able to add flashing to it. If you’re looking for a way to maintain its integrity while saving some money, you should ask a roofing pro if this is an option. Keep in mind that if your roof is in poor shape, a full replacement may be necessary before flashing is installed.