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Chapter 20 Roof Plan Components

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

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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

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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

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

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

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

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

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A-Frame Roof 9

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

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11 Roof Shape Hip Roof Eliminates roof mass Structure appears smaller Two hips form a valley

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12 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

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

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14 Roof Shape Dormers Opening in a roof to allow for a window Used in gable or hip roof

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Foundation & Wall Section

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Brick wall = 9 width( Total exterior wall)

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Stucco= 4 ( total exterior wall width)

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Block= 8 width ( exterior wall)

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Roof Slope Flat Roof: 2/12 Low Slope: 2/12-4/12 Conventional Slope Roof: 4/12- 9/12 Steep Slope: 9/12 and higher

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http://www.pole-barn.info/roof-pitch.html

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Pitch= Rise/ Clear Span Slope (pitch)= Rise : Run Example: 5:12 Pitch = Rise ___________ Span = 5/24

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Roof Pitch http://www.pole-barn.info/roof-pitch.html

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Building Calculator.. Cool!!

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25 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

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26 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

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27 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

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28 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 2/12 or greater Roof will be much heavier with tiles

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29 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

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