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Title
Valleys for optimum weather protection

Date
12/1996

Author(s)
James Carlson

Page(s)
R4-R8

Source
Professional Roofing / National Roofing Contractors Assn

Keyword(s)
valley; design criteria; open valley; closed valley; closed cut valley; asphalt shingle roof

Abstract
There are three industry accepted valley types commonly used with asphalt shingle roof assemblies. Variations can be made to each type to make them perform better under certain conditions. Not all valley constructions perform the same, and each has a niche where it is best suited to provide trouble free long term performance.

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