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Chapter 23

Chapter 23. Roof Plan Layout. Introduction. Preliminary 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

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Chapter 23

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  1. Chapter 23 Roof Plan Layout

  2. Introduction • Preliminary 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

  5. 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

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

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

  8. 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

  9. Dimensions (cont’d.)

  10. 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

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

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

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

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