Framing a Roof Architectural Drawing Objectives

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Framing a Roof Architectural Drawing Objectives • Define Ridge Board, rafter, hip, valley, sheathing, fascia, soffit, dormer, and pitch. • Label and identify the parts of a roof framing plan. Parts of a Roof • A Ridge Board is a horizontal member of the roof frame. The point at which all the rafters are attached to. • Transfers the load of the roof through the rafters to walls below. • Ridge Beam sits below the rafters. Supported by lally columns. Ridge Board v.s Beam Ridge Board Ridge Beam Rafters • Rafters extend from the ridge beam down to the top plate of a wall. Transfers the roof load in the process. • Rafters give the roof its shape and definition. Fascia & Soffit • Fascia hides the end of the rafter. Protects from weather & pests. Nailable surface for gutters. • Soffit is the underside of a roof, balcony, or over hang. Gable Roof • A Gable Roof is when all rafters extend downward from the ridge board/beam. • No Hips or Valley’s. • Another default roof in archiCAD. Hip Roof • A Hip is a type of roof where all sides slope downward to the walls. • Default wall in archiCAD. Valley Roof • A Valley is a roof design that creates a “V” shape. • Often seen on complex roof shapes. • Usually has a metal valley exposed. Dormer • A Dormer is a roofed structure that is used to increase the livable area in a home. • Used in lofts and spaces where the roof pitch is steep leaving little room. • Often contains a window to allow natural light. Sheathing • Sheathing is a layer of plywood or OSB that covers and protects the structure. • Creates a nailable surface for roofing materials. • Prevents shear forces. Roof Pitch • The Roof Pitch is the numerical measure of how steep or shallow a roof is. • Vertical Rise over Horizontal Run. • In the U.S it is defined by the rise in inches to a 12” run. • Example: 3 inch rise per 12” run is a 3:12 pitch roof. • 4:12 through 9:12 are the most common pitches. Roof Frame Plan • Roof Frame Plan details the rafters and the spacing of the roof. • Looked at from the birds eye view. Gable Roof Framing Plan Gable Roof Framed Hip & Valley Roof Valley Framed Hip Roof Framing Plan Hipped Roof Framed Different Types of Roofs.

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