Underlay roof of plastic membrane

[Flygplats_Teknikern]

Hey!
I had a solar panel company over to give me a quote, and the guy asked if there's tongue and groove board under the roof tiles. I answered yes, assuming that's how it's built. Then when I went up to look, I was surprised to see that the underlay roof consists of just a plastic sheet. So basically, roof truss, plastic sheet, battens, tiles. Is this how they built in 2012? Should I be worried? I'm mostly concerned about if the plastic sheet fails and water starts pouring into the attic. I might need to think more about this solar panel thing.

 

[Per i Hamrånge]

Hey!
Had a solar panel company over to give a quote, the guy asks if there's tongue and groove under the tiles, yes. ? I answer, assuming that's how it's built. Then when I went up and looked, to my surprise I see that the under-roof consists of just a plastic sheet. So truss, plastic sheet, battens, tiles. Is this how they build (2012)? Should I be worried? Mostly thinking about if the plastic sheet fails and water starts pouring into the attic.. Might rethink that solar panel decision.

Completely normal. Not optimal perhaps, but cheap. Therefore common on prefab houses.

 

[Flygplats_Teknikern]

Completely normal. Not optimal maybe, but cheap. Hence common on prefab houses.

Thanks for the input!