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Chapter 22

Chapter 22. Roof Plan Components. Introduction. Roof design is considered before the plan Designer considers shape, type, and aesthetics as floor plan and elevations are drawn Drafter should understand types, pitches, shapes, and materials. Types of Roof Plans. Roof plan

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Chapter 22

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  1. Chapter 22 Roof Plan Components

  2. Introduction • Roof design is considered before the plan • Designer considers shape, type, and aesthetics as floor plan and elevations are drawn • Drafter should understand types, pitches, shapes, and materials

  3. Types of Roof Plans • Roof plan • Used to show roof shape • Roof framing plan • Usually required for complicated roof shapes • Shows size and direction of construction members required to frame the roof

  4. Common Roof Terms • Common terms: • Ridge • Overhangs • Roof pitch (e.g., slight, gradual, moderate, and steep slopes) • Sun angle • Overhang size • Eavesand rakes • Boxed and soffited eaves • Cornice • Fascias and barge rafters

  5. Roof Shapes • Common roof shapes include: • Flat • Shed • Gable • A-frame • Gambrel • Hip and Dutch hip • Mansard

  6. Roofing Materials • Material depends on: • Pitch • Exterior style • Cost • Weather

  7. Roofing Materials (cont’d.) • Types of materials: • Built-up roofing • Felt and asphalt used on flat or low-sloped roofs • Shingles • Asphalt, fiberglass, and wood • Wood is also used for shakes (thicker shingles with irregular texture) • Masonite and metal

  8. Roofing Materials (cont’d.) • Types of materials (cont’d): • Clay and cement tiles • Used for high end homes or risk of fire is extreme • Metal panels • Provide savings • Speed and ease of installation • Metal is also used for flashing at all levels

  9. Roof Ventilation and Access • Attic is the space formed between ceiling joists and rafters • Typically provided with vents covered with 1/16" minimum and ¼" maximum screen mesh • Vents must have an area equal to 1/150 of attic • Area can be reduced to 1/300 • 50% (not more than 80%) of ventilating area is provided by ventilators in the upper portion of space

  10. Roof Ventilation and Access (cont’d.) • Unvented attics • Area is completely contained in building thermal envelope • Additional requirements • Refer to the text

  11. Roof Ventilation and Access (cont’d.) • Attic access • Drafter must specify how to get in if area is 30 sq ft or more and height is 30" or more • Actual opening is usually shown on floor plan • Location must be considered when roof plan is being drawn • Minimum size is 22" × 30" with 30" minimum headroom

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