chapter 22 roof plan components roof plan types roof shapes roof materials vented soffit
TRANSCRIPT
Chapter 22Chapter 22
Roof Plan Components
Roof Plan Types
Roof Shapes
Roof MaterialsVented soffit
Roof Plan Types Roof plans are used to show the shape of the roof including
roofing materials, vents, and any other objects located on the roof
Simple roof plans show roof vents, ridges, valleys, direction of slope.
Complex roof plans show individual roof members, connectors, etc.
Roof Pitch/ Slope
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
Simple Approach example
Roof Pitch/ Slope
10/12 vs. 4/12 (6/12 typical)
Simplified Version we will do in this class
Required Elements:
•Dimensions at overhangs
•Hip and Valley noted
•Pitch noted
•Roof Vents
Flat Roof Shape
• Economical• Built with slight pitch so water can run off• Parapet (false wall) is built around the
roof
Shed Roof Shape
• Less drainage problems compared to flat roof
• Can be built at any pitch (no shallower than 4/12 in our climate
Gable Roof Shape
• Two shed roofs meet at a ridge
• Two or more gables meet to form a hip or valley
A Frame Roof Shape
• Rafters are used as supporting walls
• The structure appears to form the letter “A”
Gambrel Roof Shape
• Traditional shape from colonial period
• Upper roof is greater pitch than lower roof
• Reduces cost of exterior building materials
Hip Roof Shape
• Eliminates roof mass• Structure appears
smaller• Two hips form a
valley
Dutch Hip Roof Shape
• Combination of hip and gable roof
• Center is similar to a gable roof
• Ends are similar to a hip roof
Mansard Roof Shape
• Similar to a gambrel but angled lower roof is on all four sides
• Flat roof on top
Dormer Roof Shape
• Opening in a roof to allow for a window
• Used in gable or hip roof
Dormer Roof Examples
Asphalt and Cedar Shingle ExamplesAdvantages vs. Disadvantages?
Clay and Slate Shingle ExamplesAdvantages vs. Disadvantages?
Metal Roof Examples Advantages vs. Disadvantages?
Roof Venting
1/150 square feet
1/300 sq ft if in upper half•Ridge•Turtle•Dormer•Fan
Green Roofing Practices
PHOTOVOLTAIC
Solar Thermal