Open Valley

Related terms

• Flashing

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

• Valley

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

• Overlay / Re-Cover

  Installing new shingles over one existing layer. Cheaper and faster but hides deck problems, voids some warranties, and code limits it to…

• Ohio Matching Law

  Ohio guidance that insurers reasonably match repaired/replaced materials so a roof isn't left visibly mismatched after a partial claim.

• Parapet

  A low wall extending above a (usually flat) roofline. Its cap and counter-flashing are common low-slope leak points.

• Nail Pop

  A fastener backing out and tenting or puncturing a shingle, creating a leak. Common from improper nailing or deck movement.

• Penetration

  Any object passing through the roof (vent, pipe, skylight, chimney). Every penetration is a deliberate hole that must be flashed to stay…

• Modified Bitumen

  A rolled, polymer-modified asphalt membrane for low-slope roofs, torch- or self-adhered. A common residential flat-roof system.