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WOW that's a shallow roof!
You want to search for 'radiant barrier' and 'building science' to find what you're looking for. They are normally installed in the attic and used with an attic fan.
I think foil would get torn up pretty quickly.
If water were plentiful you could setup a roof sprinkler. The sun heats up the water and evaporates it, cooling it.
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My bike runs on dihydrogen monoxide. 
I like to use these acronyms
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