Chapter 22 Roof Plan Components Roof Plan Types

Chapter 22 Roof Plan Components Roof Plan Types Roof Shapes Roof Materials Vented 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 Examples Advantages vs. Disadvantages?

Clay and Slate Shingle Examples Advantages 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