Valley

Roofing terms · plain-language definition, with its source

Roofing terms · definition

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

Source: Wikipedia — Roof (Valley)

Where this comes up on this site

  • Closed Valley

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

  • Flashing

    Thin water-resistant material installed at joints and transitions (roof-to-wall, around windows and penetrations) to direct water away an…

  • Wind Damage

    Lifted, creased, or torn-off shingles from high wind. Coverage hinges on the roof's wind rating and proper installation.

  • Underlayment (Roof)

    The water-resistant layer between deck and shingles — felt or synthetic — that backstops the roof covering.

  • Wind Rating

    The wind speed a shingle is tested to resist (e.g., 110/130 mph), dependent on shingle grade and correct nailing/starter detailing.

  • TPO Membrane

    A single-ply thermoplastic membrane for low-slope roofs — heat-welded seams, reflective white surface, widely used today.

  • Wood Shake / Shingle Roof

    Split (shake) or sawn (shingle) cedar roofing — a natural look with high maintenance and fire-rating considerations.

  • Tear-Off

    Complete removal of the old roof to the deck before re-roofing — allows deck inspection and a proper new system. The recommended approach…

Ready to Start Your Project?

Get a free estimate based on real Columbus contractor pricing.

Start Estimating → Read the roofing guides