Overlay / Re-Cover

Roofing terms · plain-language definition, with its source

Roofing terms · definition

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

Source: Wikipedia — Roof Construction (Overlay)

  • Parapet

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

  • Open Valley

    A valley finished with exposed metal flashing down the center — durable and fast-draining, a premium detail.

  • Penetration

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

  • Ohio Matching Law

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

  • Pipe Boot

    The flexible flashing collar sealing a plumbing vent pipe. The rubber gasket is a top failure point — cracked boots are a very common lea…

  • Nail Pop

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

  • Ponding Water

    Standing water on a low-slope roof 48+ hours after rain. Accelerates membrane failure and adds structural load; corrected with slope or d…

  • Modified Bitumen

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

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