Tri-City Guttering Roofing

FAMILY OWNED AND OPERATED SINCE 1969

Roofing 101

Tri-City Guttering/Roofing wants you, the consumer, to feel informed and knowledgeable regarding your roofing systems needs. The following information is provided by the National Roofing Contractors Association (NRCA) as part of their ongoing effort to educate home and building owners about roofing and roofing contractors. We hope you find this information useful.

Roof systems components

All steep-slope roof systems (i.e., roofs with slopes of 25 percent or more) have five basic components:

  1. Roof covering: shingles, tile, slate or metal and underlayment that protect the sheathing from weather.
  2. Sheathing: boards or sheet material that are fastened to roof rafters to cover a house or building.
  3. Roof structure: rafters and trusses constructed to support the sheathing.
  4. Flashing: sheet metal or other material installed into a roof system’s various joints and valleys to prevent water seepage.
  5. Drainage: a roof system’s design features, such as shape, slope and layout that affect its ability to shed water.
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Terms you should know
  • Deck/sheathing: The surface, usually plywood or oriented strand board (OSB), to which roofing materials are applied.
  • Dormer: A small structure projecting from a sloped roof, usually with a window.
  • Drip edge: An L-shaped strip (usually metal) installed along roof edges to allow water run off to drip clear of the deck, eaves and siding.
  • Eave: The horizontal lower edge of a sloped roof.
  • Fascia: A flat board, band or face located at a cornice’s outer edge.
  • Felt/underlayment: A sheet of asphalt-saturated material (often called tar paper) used as a secondary layer of protection for the roof deck.
  • Fire rating: System for classifying the fire resistances of various materials. Roofing materials are rated Class A, B or C, with Class A materials having the highest resistance to fire originating outside the structure.
  • Flashing: Pieces of metal used to prevent the seepage of water around any intersection or projection in a roof system, such as vent pipes, chimneys, valleys and joints at vertical walls.
  • Louvers: Slatted devices installed in a gable or soffit (the underside of eaves) to ventilate the space below a roof deck and equalize air temperature and moisture.
  • Oriented strand board (OSB): Roof deck panels (4 by 8 feet) made of narrow bits of wood, installed lengthwise and crosswise in layers, and held together with a resin glue. OSB often is used as a substitute for plywood sheets.
  • Penetrations: Vents, pipes, stacks, chimneys-anything that penetrates a roof deck.
  • Rafters: The supporting framing to which a roof deck is attached.
  • Rake: The inclined edge of a roof over a wall.
  • Ridge: The top edge of two intersecting sloping roof surfaces.
  • Sheathing: The boards or sheet materials that are fastened to rafters to cover a house or building.
  • Slope: Measured by rise in inches for each 12 inches of horizontal run: A roof with a 4-in-12 slope rises 4 inches for every foot of horizontal distance.
  • Square: The common measurement for roof area. One square is 100 square feet (10 by 10 feet).
  • Truss: Engineered components that supplement rafters in many newer homes and buildings. Trusses are designed for specific applications and cannot be cut or altered.
  • Valley: The angle formed at the intersection of two sloping roof surfaces.
  • Vapor retarder: A material designed to restrict the passage of water vapor through a roof system or wall.

       
               


















































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