Counter Flashing

Roofing terms · plain-language definition, with its source

Roofing terms · definition

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

Source: Wikipedia — Flashing (Counter)

  • Flashing

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

  • Parapet

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

  • Cover Board

    A rigid board over insulation on a low-slope roof providing a durable substrate for the membrane and better impact resistance.

  • Coping

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

  • Cricket / Saddle

    A small peaked structure built behind a chimney or wide penetration to divert water around it. Code-required above a chimney width thresh…

  • Cool Roof

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

  • Decking

    The structural panel surface (plywood/OSB) fastened to rafters or trusses that everything else is attached to. Rotted decking is replaced…

  • 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…

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