1. Chapter 23
Roof Plan Layout

2. Introduction Preliminary roof plan Roof plan
Coordinates key design elements (e.g., floor, roof, and elevations, and elevations)
Roof plan
Design is considered early in design process of a structure
Completed once design is finalized
Drafter must be familiar with lines and symbols

3. Representing Roof Plan Components
Steps to complete a roof plan includes:
Representing roof shape
Representing nonstructural materials
Dimensioning major components
Providing text to explain required equipment

4. Representing Roof Plan Components (cont’d.)
Representing basic gable shapes
Varied ridge heights
Bay projections parallel to the ridge
Bay projections perpendicular to the ridge
Roof intersections with varied wall heights

9. Representing Roof Plan Components (cont’d.)
Representing hip and Dutch hip roofs
Hip or valley passes through the corner of two intersecting walls
A hip or valley is represented using an angle equal to half the intersecting wall angle
Three lines represent intersections of hips, valleys, ridges, and overhangs
Overhang line of a Dutch hip roof intersects hip lines

11. Representing Structural Materials
Plan type affects the method used to show structural material

12. Representing Nonstructural Material
Nonstructural materials shown on roof plan:
Vents
Chimneys
Skylights
Solar panels
Diverters
Cant strips
Slope indicators
Downspouts

15. Dimensions Roof plan requires few dimensions Overhangs and openings
If trusses are used, openings must be located with modular dimensions
Providing a dimension extending from an exterior wall outer edge to the opening center is the best way to locate roof openings

16. Dimensions (cont’d.)

17. Annotation Notes on the roof plan can be divided into: General notes
Vent notes
Sheathing information
Roof covering and pitch
Local notes
Skylight type, size, and material
Chimney caps, cant strips, and saddles
Solar panel type and size

18. Drawing Gable Roof Plans
Refer to the text for complete instructions

19. Drawing Hip Roof Plans
Refer to the text for complete instructions

20. Drawing Dutch Hip Roof Plans
Refer to the text for complete instructions