Shingles are meant to overlap; you want the flaps pointing down, so they don’t trap dirt and debris. Starting at the bottom of the roof also makes it easy to get the overhang distance right without needing to measure and calculate. It depends on what you mean by hard, but most experienced construction workers say that roofing work is more difficult than many other types of construction. An estimated 30% of construction fatalities occur during roofing work — usually from falls — so it can be quite dangerous. If you don’t have any roofing experience, you’re better off hiring a professional roofer than trying to DIY. There’s no shame in hiring a roofing contractor and it might be the right call, especially if you have an old roof that might need more extensive repairs before it can be re-shingled.

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