open valley

open valley

[′ō·pən ′val·ē] (building construction) A valley formed at the intersection of two roof surfaces and lined with either metal or a mineral-surfaced roofing material; the lining is exposed at the intersection.

open valley

open valley A type of valley on a roof. The valley formed at the intersection of two roof surfaces is lined with metal or mineral-surfaced roofing, and the shingles or slates are not laid