Paragraph 76. A third-pitch roof is one in which the elevation of the rafters is one-third the width of the building. To illustrate: if a building is 18 ft. wide a third-pitch roof would be one in which the elevation to the point of the rafters would be one-third of 18 ft., which is 6 ft. To make this cut a steel square should be used, as indicated in Chapter 2, Paragraph 25.

Figure 61.