roof valley

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The trough or gutter formed by the intersection of two inclined planes of a roof.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.
References in periodicals archive ?
You might also have consulted your local building department to see whether they allow pipe penetrations in roof valleys and whether they require flashing on all roof penetrations.
Roof valleys and depressions also caused problems when water couldn't drain quickly enough.