Roof Framing
Table of Contents

Introduction | Preview A Chapter | Back Cover

1. Introduction to a Simple Roof, 5
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

2. Cutting Common Rafters, 20
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

3. Getting the Ridge Length Right, 62
Mathematical ridge length, 63
Double and single cheek cuts, 65
Practice in framing points, 71
Drawing elevations, 92
Actual ridge height, 94

4. Cutting Hip Rafters, 97
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

5. Valley Rafters are Easy, 141
An equal span addition, 141
The valley rafter, 145
A narrow span addition, 153
The supporting valley rafter, 154
The shortened valley rafter, 156

6. Jack Rafters are Easy Too, 164
Hip Jack rafters, 165
Valley Jack Rafter, 173
Hip-Valley Jack Cripple Jacks, 175
Valley cripple Jacks, 177

7. From Dutch to California, 180
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

8. Math for Non-Centered Ridges, 240
Defining the problem, 240
Solving by the layout method, 243
Solving by the math method, 245
Framing at the ridge, 247

9. Framing a Gazebo, 249
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

10. A Simple Irregular Roof, 309
Drafting the model and scaling measurements, 310
Layout with mathematical calculations, 331
Cutting and framing the irregular model, 351

11. A Complex Irregular Roof, 362
Design, 362
Drafting the plan view, 365
Establishing the section lines, 367
The sectional views, 372

12. Irregular Roof Problems, 384
The unequal pitch/equal ridge roof, 384
The irregular California, 397
The shed dormer model, 403
The hip or gable dormer, 408

Appendix, 409
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

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

Index, 472

Introduction | Preview A Chapter | Back Cover