It's called 4 year greenhouse film, due to its 4 year warranty. 6 Mil, UV stabilized. Don't buy the crap at Lowe's or HD, it's not the same as the commercial grade. If you were wondering, you're better off buying a whole roll. The money they charge you for a custom cut is outrageous. A 50 foot roll is around $100.
Another idea is to use Suntuf panels. They are more durable than greenhouse film, but would take more effort to install and remove. Made of the same stuff as 2 liter bottles. Much clearer than PE film, same light transmission value.
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