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Chapter 20 PowerPoint Presentation

Chapter 20

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Chapter 20

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  1. Chapter 20 Roof Plan Components

  2. Links for Chapter 20 Roof Plan Types Roof Shape Roof Materials Related Web Sites

  3. Roof Plan Types • Roof plan is used to show the shape of the roof including roofing material, vent, and underlayment • Size and direction of construction members are drawn • Required for only complex roof designs

  4. Roof Pitch • Slope or roof pitch is the description of the angle of the roof as horizontal run and vertical rise • Pitch is represented with a fraction which converts to an angle

  5. Roof Shape • Flat Roof • Economical • Built with slight pitch so water can run off • Parapet (false wall) is built around the roof

  6. Roof Shape • Shed Roof • Less drainage problems compared to flat roof • Can be built at any pitch

  7. Roof Shape • Gable Roof • Two shed roofs meet at a ridge • Two or more gables meet to form a hip or valley

  8. Roof Shape • A-Frame Roof • Rafters are used as supporting walls • The structure appears to form the letter “A”

  9. Roof Shape • Gambrel Roof • Traditional shape from colonial period • Upper roof is greater pitch than lower roof • Reduces cost of siding

  10. Roof Shape • Hip Roof • Eliminates roof mass • Structure appears smaller • Two hips form a valley

  11. Roof Shape • Dutch Hip Roof • Combination of hip and gable roof • Center is similar to a gable roof • Ends are similar to a hip roof

  12. Roof Shape • Mansard Roof • Similar to a gambrel but angled lower roof is on all four sides

  13. Roof Shape • Dormers • Opening in a roof to allow for a window • Used in gable or hip roof

  14. Roofing Materials • Roof materials depend on the pitch, style, structure cost, and weather • Squares are used to order roofing materials • A square covers 100 sq. ft. of surface • Roofing materials also effect the framing members and foundation

  15. Built-up Roofing • Used with pitch below 3/12 • Felt and asphalt is commonly use for flat or low-sloped roof • Hot asphalt is spread between the layers of roofing material

  16. Shingles • Minimum pitch is 4/12 with 15-lb felt underlayment • Made of wood, asphalt, or fiberglass • Most shingles are three-tab with a self-sealing adhesive on the back • Wood shakes are thicker than shingles and more irregular in shape

  17. Clay and Cement Tiles • Used on expensive homes where the threat of fire is extreme • Available in both curved and flat designs • Pitch is usually 2½/12 or greater • Roof will be much heavier with tiles

  18. Metal Panels • Easy to install and therefore less expensive • Panels are made of 22- or 24-gage metal • Provide good water and fire protection • Available in widths of 18” or 24” • Variety of metals are available including copper, stainless steel, aluminum and zinc

  19. Related Web Sites • Asphalt Roofing Manufactures - www.asphaltroofing.com • Cedar Shake & Shingle Bureau - www.cedarbureau.org • Roofing Industry Educational Institute- www.riei.com • Single Ply Roofing Institute- www.spri.com