>> just sheets of 10 mil black plastic placed on top
>
> This is a great idea. How long would it take for them to chew through 
> these or do they leave this weight of plastic alone?

They don't eat 10 mil black (or white for that matter).  That is why we use 
that weight.  Heat goes thru, though. You can carry as many as you need, and 
they cost next to nothing.

Bees can eat thru garbage bags, tho.  I have a friend who used a chunk of 
pink fibreglas as a pillow in a garbage bag and they chewed thru.  Not good. 

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