Figure 19.—Permanent curve of rafters and adjustment; a, struts shaping permanent curve of rafters:

1-8, purlins; 9, supporting post; 10, ridgepole; 11, rafters; 12, wall plate; 13, horizontal batten (talava); 14, lower end of scaffolding; 15-19, five struts propping up left rafter, similar on other side; b, adjustment of warped rafter to width of purlin by bracing with rope: 6, purlin; 11, rafter; 20, rope tied to rafter.