Ice & Water Shield

Roofing terms · plain-language definition, with its source

Roofing terms · definition

A self-adhered waterproof membrane at eaves, valleys, and penetrations that blocks ice-dam and wind-driven-rain leaks. Code-required at eaves in cold climates.

Source: Wikipedia — Ice & Water Membrane

  • Eave

    The lower roof edge that overhangs the wall. Ice-and-water protection, drip edge, and gutters all key off the eave.

  • Penetration

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

  • Valley

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

  • Ice Dam

    A ridge of ice at the eave from attic heat melting and refreezing snow, forcing water back under shingles. Fixed by air-sealing, insulati…

  • Hip & Ridge Cap

    Specialized shingles that wrap and seal the roof's hips and ridges. Upgraded caps improve wind rating and appearance.

  • Impact-Rated Shingle

    A Class 4 (UL 2218) hail-resistant shingle that may earn an insurance premium discount in hail-prone regions.

  • Hip

    The external angle where two sloping roof planes meet, running from ridge to eave. Hip roofs shed wind well but use more material.

  • Insulation Baffle

    A chute at the eave keeping insulation from blocking soffit-vent airflow into the attic.

Ready to Start Your Project?

Get a free estimate based on real Columbus contractor pricing.

Start Estimating → Read the roofing guides