Usually the visible portion of the hip battens I see on tile roofs are coated with moisture resistant mastic. This house had some type of poly flashing material over the hip battens which was leaving the wood battens exposed at some areas. In addition, the wind was blowing on this day and I could see and hear the poly material flapping at the hip battens. I have never seen it done this way. Is this type of material allowed in lieu of mastic? See photo for example.

Thanks,

Eric

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