Galvalume

Roofing terms · plain-language definition, with its source

Roofing terms · definition

A zinc-aluminum-coated steel substrate giving metal roofing strong corrosion resistance; a common base for residential metal panels.

Source: Wikipedia — Metal Roof

Where this comes up on this site

  • Granule Loss

    Shedding of protective surface granules from age, hail, or foot traffic, exposing asphalt to UV and accelerating failure.

  • Gable

    The triangular wall section under the ends of a pitched roof; a gable roof is the classic two-slope form.

  • Granules

    The mineral coating on asphalt shingles that protects the asphalt from UV and adds color. Granule loss is a key wear and hail-damage indi…

  • Field Shingles

    The main shingles covering the broad roof area, as distinct from starter, hip, and ridge-cap shingles.

  • Hail Damage

    Impact bruising and granule loss that shortens shingle life. The defining peril behind most roof insurance claims; assessed by a trained…

  • Felt Paper

    Traditional asphalt-saturated underlayment (#15/#30). Largely superseded by synthetic underlayment, which is lighter and tear-resistant.

  • Hip

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

  • Fascia

    The board at the eave covering rafter tails and carrying the gutter. Rot here is usually a sign of gutter or drip-edge failure.

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