See Module 13. To use a framing square to lay out rafters. Demonstrate the use of the framing square. Then have students practise laying out common rafters for various roof slopes and spans. To lay out the rafters for a gable roof and a gambrel roof.
Students can create small rafters that span a short distance.
Building a garden shed is a possible project that will demonstrate a variety of roof styles. 15.5 To describe a roof truss and its design. If space, time, or materials do not allow a large project, students could work on partial assemblies. Students could tour a truss manufacturing plant to observe how trusses are laid out and assembled. Discuss materials, adhesives, nailing, etc.