Closed Valley

Roofing terms · plain-language definition, with its source

Roofing terms · definition

A valley where shingles are woven or cut over the center. Common and economical but more leak-sensitive than an open metal valley.

Source: Wikipedia — Roof (Valley)

  • Valley

    The internal angle where two roof planes meet, channeling heavy water flow. A leak-prone area requiring careful flashing (open or closed…

  • Condensation / Attic Moisture

    Moisture-laden house air condensing on cold roof decking, causing mold and rot. A ventilation and air-sealing problem, not always a roof…

  • Clay / Concrete Tile

    Heavy, very durable tile roofing common in warm climates; requires engineered structural support for the weight.

  • Cool Roof

    A roof with high solar reflectance and emittance that lowers roof temperature and cooling costs; rated by the Cool Roof Rating Council.

  • Chimney Flashing

    The system of base, step, and counter flashing plus a cricket that waterproofs a chimney. One of the most failure-prone roof details.

  • Coping

    The protective cap on top of a parapet wall that sheds water off both sides. Failed coping is a major parapet leak source.

  • Certified Installer

    A contractor credentialed by a shingle manufacturer, required to offer that maker's enhanced system warranties.

  • Counter Flashing

    Flashing set into a masonry joint (chimney/parapet) that laps over step or base flashing to seal the top edge.

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