| OCR Text |
Show Roof Framing Systems Figure 157: Purlin system for supporting the common rafter roof. The basic roof framing system in the valley before 1890 was a simple . common rafter gable roof. the same size.) (In a common rafter roof, all the rafters are There .were alternative roof shapes, including the hip (figure 97) and the pyramid (figure 114), but generally the gable roof consisting of paired triangulated rafters resting on the house walls was the rule. Two different methods of supporting the roof ~ere used. In the first, the roof was carried by heavy horizontal purlins running parallel to the ridge (figure 157). The weight of the roof was transferred to the 275 |
