Instant Roof

I just posted this on whynot.net

Have a factory that produces a solid sheet of 1/2 to 1/4 inch thick plastic that is 20 foot wide and cut at intervals to be a length of about 50 feet or whatever. But the general idea is that you roll up the finished product to transport it to a building site and then at the building site you just unroll it and put it on top of the house, as well as attach it in whatever way works best. This roof will last forever because it's plastic and may not blow away in the wind if it's thick and heavy plastic. It could be an arched roof or an A shaped roof. An arched roof may just be easier because it's the natural shape left over from being rolled up. Also for natural lighting just cut out a hole of any shape in the roof, and put a frosted translucent plastic window over that hole, for easy energy savings during the day.
The plastic to make the roof sheet out of could be recycled and any color. In the same way that they make imitation wood planks out of recycled plastic. Also this kind of roof would be a good insulator already because it is made of plastic, but an alternative may be to make it out of rubber. And you could always just spray foam the underside of the roof.