Plastic Bottles vs Translucent Corrugated Fiberglass or Plastic
Clever guy... kudos! However, just thinking that a translucent plastic roof would provide a LOT more light in those spaces, can be installed in a fraction of the time vs. cutting all those holes, and is probably cheaper than a tin roof, albeit a lot hotter. You can get translucent corrugated fiberglass or plastic roofing cheap.
"Light transmission - what can I expect from Clear, White and Green Corrugated roofing?
First, keep in mind that a sheet of clear Plexiglass (Plexiglas) acrylic sheet is perfectly clear and is rated at 92%.
You lose 4% from reflected light off the first (top) surface and another 4% off the bottom (inside) surface.
Polycarbonate is worse - 88% for 1/8" and much less for 1/2". Glass is less than 92%!
Now with fiberglass, you have the resin and then the fiberglass - even in clear panels, the strands of fiberglass will reflect back light. No way you can get 92% like Plexiglass. So:
CLEAR fiberglass panels allow 85-90% of visible light in.
WHITE fiberglass panels allow 70-75% of visible light in.
GREEN fiberglass panels allow 35-40% of visible light in.
Plastic panels will allow a bit more light in.