Roofing isn’t unskilled, but building codes make it sort of a commodity. If you just invented a new type of roof, I would not want you to install the very first

Roofing isn’t unskilled, but building codes make it sort of a commodity. If you just invented a new type of roof, I would not want you to install the very first one on Friday night and then send home every available expert to party or travel or whatever for the next two days.