There were many issues with this roof, the lining of the this valley being one of them. My understanding was that an open valley needs to be lined with flashing or a membrane, and that asphalt shingles are never acceptable, regardless of slope. I was curious if there were exceptions to this. Interestingly, this roof had several different valleys, all installed in different flavors of incorrect. IMG_3807.HEIC
source https://www.inspectorsjournal.com/topic/18792-asphalt-shingles-in-open-valley/?do=findComment&comment=171997
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