Sparks are going to fly if this skinned wire gets any more skinned. Dragging boxes across the attic floor, rodents, etc. Who knows why this wire is damaged but if the insulation is worn any more, this gas pipe could develop into a huge problem and make someone suddenly homeless, or worse. Here's a tip: When flooring your attic, use dimension lumber like 1x4's or 2x4's instead of large sheet material like plywood or other sheathing. With dimension lumber you can easily weave in and out of wires without stretching them and you won't flatten your insulation as much. Space the planks an inch apart and your wires can easily lay undisturbed and accessible should your electrician need to get to them.