Chimney Flashing

Roofing terms · plain-language definition, with its source

Roofing terms · definition

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

Source: Wikipedia — Flashing (Chimney)

Where this comes up on this site

  • Counter Flashing

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

  • Flashing

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

  • Clay / Concrete Tile

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

  • Certified Installer

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

  • 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.

  • Built-Up Roof (BUR)

    A low-slope roof of alternating bitumen and felt plies topped with gravel — the traditional 'tar and gravel' flat roof.

  • 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…

  • Box / Static Vent

    Individual non-powered roof exhaust vents ('turtle vents') used where a continuous ridge vent isn't feasible.

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