parts of a roof

Description of typical parts of a roof
  Roof Top Components

  * Dormer - the structure (walls and roof) around a window that projects from
             a sloped roof.
  * Roof Truss  the skeleton of the roof. Framework of beams that support the roof.
  * Rafters  The beams that run from the top of the roof to the bottom. Part of
             the roof truss.
  * Decking or Sheathing  Panels that cover the rafters and to which the roofing
             material (shingles, metal panels, etc..) are attached.
  * Underlayment  often called tar paper this heavy felt paper (synthetic
             materials are available as well) is placed on top of the decking
             before the roofing material is installed to offer an additional
             layer of protection from moisture.
  * Drip Edge  edging that is placed at the end of the roof (end of the eaves) used
             to allow water to run-off and drip clear of underlying construction.
  * Fascia  trim used to cover the rafter end of the eaves. Often where gutters
             are attached to the house.
  * Soffit  a finished underside of the eaves. Covers the area between the end of
             the eaves and the house.
  * Valley - internal angle formed when by the intersection of two sloping roof
             planes. The intersection of a cross hip or cross gable roof.
  * Hip - external angle formed by the intersection of two sloping roof planes.
  * Gable  triangle shaped part of the end of a building underneath the roof and
             above the main portion of the house.
  * Ridge  the highest point of the roof that runs the length of the roof.
  * Flashing - Pieces of metal used to prevent the seepage of water around any
             intersection or projection in a roof, such as vent pipes, chimneys,
             valleys, and the joints at vertical walls.
  * Starter Strip - Asphalt roofing applied at the eaves that provides protection
             by filling in the spaces under the cutouts and joints of the first
             course of shingles.

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