uncut usa on Instagram: "This is a smart roofing trick… but there’s a BIG safety warning behind it ⚠️🏠🔧 The clip shows a DIY method for installing corrugated roof sheets without cracking them. The problem with brittle roofing panels is that one wrong hammer hit can spider-crack the sheet instantly — wasting material and turning the job into a mess. So the hack is simple (and kinda genius): They slide a **razor blade / thin metal strip** under the nail head before hammering. That tiny piece spr