Traditional Yurt: felt inside or outside drip edge?

[calcetines]

Yeah sure. Ok so I bought the yurt from a spanish company so I have to translate some words:
First layer Cotton inner fabric
Second layer 3cm felt

Third layer Esterre 60 - HPV (the black stuff). On the order it's called "membrana extra impermeable y transpirable" which translates as "extra waterproof and breathable membrane."
Fourth layer A plasticy looking white fabric which is called "membrana impermeable anti-uva" on the invoice, I thought uva was either a typo or meant as much as anti UV
Fifth layer is a thick outside canopy

Wondering if the 3rd & 4rd layer is commonly used......What is a actually a common layer structure? Inner fabric, felt and outer canopy and more???


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