Chapter 23 Roof Plan Layout Introduction Preliminary roof

Chapter 23 Roof Plan Layout

Introduction • Preliminary roof plan – Coordinates key design elements (e. g. , floor, roof, 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

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

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

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

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

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

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

Dimensions (cont’d. )

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

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

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

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