Roof Framing

Table of Contents

• Span and total run, 8
• Total rise, 9
• Unit run and unit rise, 10
• Two types of roof framing, 13
• Allowable span, 14
• Common rafter roof angle chart, 18

• Finding unit length, 22
• The model rafter plate, 26
• Mathematical length: framing square method, 26
• Layout lines for the common rafter, 32
• Methods of computation, 46
• First ancient and true method, 47
• Second ancient and true method, 56

• Mathematical ridge length, 63
• Double and single cheek cuts, 65
• Practice in framing points, 71
• Drawing elevations, 92
• Actual ridge height, 94

• Unit run of the hip, 97
• Hip shortening and setback, 99
• Finding the length of hip rafters, 103
• Finding the hip rafter with secant, 113
• Building a model hip roof, 115
• Hip and valley rafter roof angle chart, 140

• An equal span addition, 141
• The valley rafter, 145
• A narrow span addition, 153
• The supporting valley rafter, 154
• The shortened valley rafter, 156

• Hip Jack rafters, 165
• Valley Jack Rafter, 173
• Hip-Valley Jack Cripple Jacks, 175
• Valley cripple Jacks, 177

• The Dutch, 180
• The Tudor peak, 189
• The blind valley, 201
• The shed roof, 214
• Gable end framing, 216
• The barge board and the overhang, 221
• The gambrel roof, 226
• The California, 233

• Defining the problem, 240
• Solving by the layout method, 243
• Solving by the math method, 245
• Framing at the ridge, 247

• Math for a regular polygon, 249
• The octagon and the square, 267
• Drafting an octagon roof, 283
• Cutting the octagon hips, 290
• Octagon roof angle chart, 308

• Drafting the model and scaling measurements, 310
• Layout with mathematical calculations, 331
• Cutting and framing the irregular model, 351

• Design, 362
• Drafting the plan view, 365
• Establishing the section lines, 367
• The sectional views, 372

• The unequal pitch/equal ridge roof, 384
• The irregular California, 397
• The shed dormer model, 403
• The hip or gable dormer, 408

• Framing square scales, 409
• Roof cutter's geometry and trigonometry, 416
• Pitch wall framing, 421
• Crickets and hog valleys,425
• Calculatingroofareafordifferentpitches,427
• Cutting roof sheathing, 429
• Ellipses for roof framing, 431
• Steps to calculate an irregular roof, 436

• Chapter 1, 447
• Chapter 2, 448
• Chapter 3, 451
• Chapter 4, 462
• Chapter 5, 464
• Chapter 6, 465
• Chapter 8, 468
• Chapter 10, 470